CN114436387B - Method and apparatus for treating wastewater - Google Patents
Method and apparatus for treating wastewater Download PDFInfo
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- CN114436387B CN114436387B CN202210171033.7A CN202210171033A CN114436387B CN 114436387 B CN114436387 B CN 114436387B CN 202210171033 A CN202210171033 A CN 202210171033A CN 114436387 B CN114436387 B CN 114436387B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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Abstract
The application discloses a method and a device for treating wastewater, wherein the method for treating wastewater comprises the steps of introducing acid and the wastewater into a reaction accommodating device; introducing an absorbent comprising ferric sulphate and/or ferrous sulphate into the absorption containment means; and introducing the gas to be treated, which is escaped from the reaction accommodating device and comprises hydrogen sulfide, into the absorption accommodating device. When the treatment method disclosed by the technical scheme is adopted to treat the wastewater comprising bicarbonate and hydrogen sulfide, the subsequent treatment process of the precipitated impurities is simpler and the cost is relatively lower.
Description
Technical Field
The application relates to the technical field of oilfield exploitation, in particular to a wastewater treatment method and a wastewater treatment device.
Background
In the process of petroleum exploitation, oilfield produced water is generated, the oilfield produced water mainly comprises oil production sewage, the oil production sewage mainly comprises calcium chloride type and sodium bicarbonate type, and the sodium bicarbonate type oil production sewage contains a large amount of hydrogen sulfide gas, so that the toxicity is high, the corrosiveness is high, and the serious threat to the normal work of equipment and the personal safety of staff exists.
Currently, in the case of sodium bicarbonate type oil extraction wastewater, an alkaline substance such as calcium hydroxide is generally used to react with sulfur element to form a precipitate for removing sulfur element. However, in the process of removing hydrogen sulfide by adopting the technical scheme, a large amount of impurities such as calcium carbonate and calcium sulfate are also generated along with the precipitation of sulfur element, so that the subsequent treatment process of the precipitated impurities is complicated and the cost is relatively high.
Disclosure of Invention
The application discloses a wastewater treatment method and a wastewater treatment device, which are used for solving the problems that the subsequent treatment process of the precipitated impurities is complex and the cost is relatively high due to the fact that the precipitated impurities generated in the prior treatment of sodium bicarbonate oil extraction wastewater contain multiple components.
In order to solve the problems, the application adopts the following technical scheme:
in a first aspect, embodiments of the present application disclose a method for treating wastewater including bicarbonate and hydrogen sulfide, the method comprising:
introducing acid and the wastewater to a reaction containment device;
passing an absorbent comprising ferric sulphate and/or ferrous sulphate into an absorption containment means;
and introducing the gas to be treated, which is escaped from the reaction accommodating device and comprises hydrogen sulfide, into the absorption accommodating device.
In a second aspect, an embodiment of the present application discloses a treatment apparatus for wastewater, the wastewater including bicarbonate and hydrogen sulfide, using the treatment method, the treatment apparatus comprising:
the absorption and accommodation device is communicated with a first pipeline, and the absorbent is introduced into the absorption and accommodation device through the first pipeline;
the reaction accommodating device is communicated with the second pipeline and the third pipeline, the wastewater is introduced into the reaction accommodating device through the second pipeline, the acid is introduced into the reaction accommodating device through the third pipeline, and the reaction accommodating device is communicated with the absorption accommodating device so as to introduce the gas to be treated, including hydrogen sulfide, escaping from the reaction accommodating device into the absorption accommodating device.
The technical scheme adopted by the application can achieve the following beneficial effects:
the embodiment of the application discloses a method for treating wastewater, wherein the wastewater comprises bicarbonate and hydrogen sulfide, acid and wastewater are led into a reaction accommodating device to react with each other to generate carbon dioxide, and hydrogen sulfide gas dissolved in the wastewater can escape from liquid along with the generation of the carbon dioxide, so that the aim of gas-liquid separation is fulfilled, and preparation is made for the subsequent treatment of the hydrogen sulfide gas. By introducing the absorbent comprising ferric sulfate and/or ferrous sulfate into the absorption and accommodation device and introducing the gas to be treated comprising hydrogen sulfide escaping from the reaction and accommodation device into the absorption and accommodation device, the hydrogen sulfide gas and the absorbent can react with each other, the purpose of solidifying sulfur element in the hydrogen sulfide gas can be achieved, and the purpose of purifying wastewater is further achieved. As described above, in the solidification process of the sulfur element, the precipitate basically only contains the sulfur element and the iron element, and the difficulty in the treatment and precipitation of the iron element is relatively small, so that the subsequent treatment difficulty of the precipitated impurities can be reduced, and the cost is reduced. In addition, in the treatment process, the alkalinity of the liquid after the treatment is not strong, so that the difficulty in other treatment works of the liquid for removing the hydrogen sulfide gas is relatively small.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a flow chart of a processing method disclosed in an embodiment of the present application;
fig. 2 is a schematic diagram of a processing apparatus according to an embodiment of the present application.
Reference numerals illustrate:
110-absorption and accommodation devices, 121-pressure-bearing reaction kettles, 122-water distributors, 123-air floatation tanks, 124-gas collecting hoods, 130-pipeline mixers, 140-slag scraping mechanisms, 150-filtering mechanisms, 160-spiral shell stacking machines, 170-plate-and-frame filter presses, 180-aeration fans, and water distribution pipes,
200-a second pipeline,
310-acid storage, 320-coagulant storage, 330-flocculant storage, 340-absorbent storage, 350-pH regulator storage,
400-ORP detection mechanism,
510-first collection means, 520-second collection means, 530-third collection means, 540-concentration tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The technical scheme disclosed by each embodiment of the application is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present application discloses a method for treating wastewater, wherein the wastewater includes bicarbonate and hydrogen sulfide, that is, the wastewater is a liquid including alkali bicarbonate, and hydrogen sulfide is dissolved in the liquid. For example, the wastewater may be, in particular, oil recovery wastewater in oilfield produced water. The treatment method disclosed by the embodiment of the application can be used for treating the wastewater, so that pollutants in the wastewater are treated, the purpose of purifying the wastewater is achieved, and the environmental protection concept is practiced.
The processing method disclosed by the embodiment of the application comprises the following steps:
s1, introducing acid and wastewater into a reaction accommodating device. The reaction container is an apparatus for carrying out the treatment method according to the embodiment of the present application, and the shape and size of the apparatus are not limited herein. Specifically, the acid and the wastewater may be introduced into the reaction container by direct dumping, or a plurality of temporary storage containers may be provided to temporarily store the acid and the wastewater, respectively, and the acid and the wastewater may be introduced into the reaction container by pipe transportation.
As described above, a large amount of hydrogen sulfide gas is also dissolved in the wastewater, and similarly, since the wastewater reacts with the acid to generate carbon dioxide gas, the dissolved hydrogen sulfide gas can also escape out of the liquid together with the carbon dioxide gas, thereby removing the hydrogen sulfide gas in the solution to be treated, so that the residual liquid in the reaction container device does not substantially contain hydrogen sulfide.
Of course, in the above-mentioned introducing process, the respective amounts (or corresponding reaction ratios) of the acid and the wastewater may not be controlled, and in this case, bicarbonate and hydrogen sulfide in the wastewater may be treated more thoroughly by means of multiple treatments.
In another embodiment of the application, the addition of acid can be correspondingly controlled based on the bicarbonate content (or the reaction parts) in the wastewater, so that the bicarbonate in the wastewater can be treated completely through single treatment. In order to make the reaction of bicarbonate more sufficient, the addition amount of acid may be appropriately increased.
More specifically, the acid may be dilute hydrochloric acid, and in another embodiment of the present application, the acid may be dilute sulfuric acid in consideration of the fact that the wastewater itself contains sulfur, which may prevent the introduction of new elements during the treatment process, leading to increased difficulty in the treatment and deterioration of the controllability of the treatment process. Taking dilute sulfuric acid as an example, in the process of adding acid, the content ratio of the added dilute sulfuric acid to bicarbonate in the wastewater can be 1:1 to 1:2, so that the added dilute sulfuric acid is reduced as much as possible under the condition of ensuring that the reaction sufficiency of bicarbonate is higher, the cost is saved, and the treatment difficulty of the subsequent process can be reduced.
As described above, in the process of generating carbon dioxide by the interaction of the acid and bicarbonate in the wastewater, hydrogen sulfide gas dissolved in the wastewater also escapes from the liquid, and the escaping gas includes hydrogen sulfide and possibly other gases such as carbon dioxide, and the mixed gas is marked as a gas to be treated because the mixed gas includes hydrogen sulfide gas which needs to be continuously treated. In order to achieve the purpose of treating the gas to be treated including the hydrogen sulfide gas, the treatment method disclosed in the embodiment of the application may further include:
s2, introducing an absorbent comprising ferric sulfate and/or ferrous sulfate into the absorption accommodation device 110. Similar to the reaction containment devices mentioned above, the absorption containment device 110 is also the means utilized in the practice of the present treatment method. Alternatively, the state of the absorbent may be determined according to the specific situation within the absorption capacity device 110. For example, the absorption containment device 110 may contain water therein, in which case the absorbent that passes into the absorption containment device 110 may be a solid substance. In order to make the distribution of the iron sulfate and/or ferrous sulfate in the absorption housing means 110 more uniform, the iron sulfate and/or ferrous sulfate introduced into the absorption housing means 110 is optionally in solution, i.e. the absorbent comprises at least water in addition to the iron sulfate and/or ferrous sulfate. Specifically, the absorbent may be introduced into the absorption containment device 110 by pouring or piping, or the like.
In addition, in the embodiment of the present application, S2 and S1 are not related in time, and the sequence of the two may be determined according to the actual situation, which may, of course, be performed together, which is not limited herein. The absorbent may include only ferric sulfate, or may include only ferrous sulfate, or the absorbent may include both ferric sulfate and ferrous sulfate. In addition, in the case that the absorbent only includes ferric sulfate, in order to ensure that the treatment effect of the hydrogen sulfide gas is relatively good, a proper amount of sodium hydroxide may be introduced into the absorption and accommodation device 110, and in the case that the absorbent only includes ferrous sulfate, the sodium hydroxide may be little or not substantially supplemented into the absorption and accommodation device 110.
After the absorbent is introduced into the absorption container 110, the treatment method disclosed in the embodiment of the present application further includes:
and S3, introducing the gas to be treated, which is discharged from the reaction accommodating device and comprises hydrogen sulfide, into the absorption accommodating device 110. Specifically, the gas to be treated may be conveyed to the absorption and containment device 110 by means of a pipe, so that the hydrogen sulfide in the gas to be treated can react with the absorbent, specifically iron ions and ferrous ions, in the absorption and containment device 110, to achieve the purpose of treating the hydrogen sulfide. Of course, in order to improve the treatment efficiency and the treatment thoroughly degree of the hydrogen sulfide in the gas to be treated, the gas to be treated may be introduced from the bottom or the middle lower part of the absorption and accommodation device 110; further, a gas equalization member may be disposed within the absorption containment device 110 to allow the gas to be treated to be more uniformly introduced into the absorption containment device 110 and to interact with the absorbent in the absorption containment device 110.
Specifically, the chemical reaction formula of the absorbent with hydrogen sulfide is as follows:
H 2 S+Fe 2 (SO 4 ) 3 ＝2FeSO 4 +H 2 SO 4 +S↓
H 2 S+FeSO 4 ＝H 2 SO 4 +FeS↓
as can be seen from the above reaction scheme, the sulfur element in the hydrogen sulfide gas can be converted into precipitate by the absorbent, and the purpose of treating the hydrogen sulfide gas can be achieved. After the hydrogen sulfide gas in the gas to be treated is absorbed, other gases such as carbon dioxide gas and the like may still be included, the gases basically do not damage the environment, and can be discharged to the atmosphere after detection, based on this, an exhaust port needs to be provided on the absorption accommodating device 110, so that the residual gas in the gas to be treated after the treatment work is completed can be discharged out of the absorption accommodating device 110 through the exhaust port, and the subsequent work of the absorption accommodating device 110 can be ensured to be normally performed.
The embodiment of the application discloses a method for treating wastewater, wherein the wastewater comprises bicarbonate and hydrogen sulfide, acid and wastewater are led into a reaction accommodating device to react with each other to generate carbon dioxide, and hydrogen sulfide gas dissolved in the wastewater can escape from liquid along with the generation of the carbon dioxide, so that the aim of gas-liquid separation is fulfilled, and preparation is made for the subsequent treatment of the hydrogen sulfide gas. By introducing the absorbent comprising ferric sulfate and/or ferrous sulfate into the absorption and accommodation device 110 and introducing the gas to be treated comprising hydrogen sulfide escaping from the reaction and accommodation device into the absorption and accommodation device 110, the hydrogen sulfide gas and the absorbent can react with each other, the purpose of solidifying sulfur element in the hydrogen sulfide gas can be achieved, and the purpose of purifying wastewater can be further achieved. As described above, in the solidification process of the sulfur element, the precipitate basically only contains the sulfur element and the iron element, and the difficulty in the treatment and precipitation of the iron element is relatively small, so that the subsequent treatment difficulty of the precipitated impurities can be reduced, and the cost is reduced. In addition, in the treatment process, the alkalinity of the liquid after the treatment is not strong, so that the difficulty in other treatment works of the liquid for removing the hydrogen sulfide gas is relatively small.
As described above, in the treatment method disclosed in the embodiment of the present application, the purpose of fixing the sulfur element is achieved by using the absorbent including ferric sulfate and/or ferrous sulfate, and part of the iron element is precipitated and lost during the solidification of the sulfur element, based on which, by introducing an excessive amount of absorbent into the absorption and containment device 110 based on the amount of hydrogen sulfide gas to be absorbed before introducing the gas to be treated into the absorption and containment device 110, the absorbent in the absorption and containment device 110 is ensured to have the capability of completely treating hydrogen sulfide.
In order to make the treatment thoroughly and the treatment efficiency of the hydrogen sulfide gas relatively higher, before the gas to be treated is introduced into the absorption and containment device 110, an absorbent containing a preset content of ferric sulfate and/or ferrous sulfate may be introduced into the absorption and containment device 110 according to parameters such as the containment device of the absorption and containment device 110 and the introduction rate of the gas to be treated. Based on this, in order to ensure that the treatment of the hydrogen sulfide gas is relatively thorough, the above S3 may include:
the redox potential of the liquid in the absorption containment device 110 is detected. Specifically, the oxidation-reduction potential in the absorption-containing device 110 can be detected by providing the ORP detection mechanism 400 in the absorption-containing device 110 to determine the reaction degree of the absorbent by using the oxidation-reduction potential of the liquid in the absorption-containing device 110, and the reliability and convenience of this detection are high. Wherein ORP is the oxidation-reduction potential.
The content of hydrogen sulfide in the exhaust gas discharged from the exhaust port of the absorption housing device 110 is detected. Specifically, a hydrogen sulfide detecting mechanism may be disposed at the exhaust port of the absorption housing device 110 to detect the content of hydrogen sulfide in the exhaust gas discharged from the exhaust port by using the hydrogen sulfide detecting mechanism, and the sensitivity and the detecting efficiency of this detecting method are relatively high.
And in the case that the oxidation-reduction potential exceeds the first preset value and the content of hydrogen sulfide does not exceed the second preset value, introducing the gas to be treated, including hydrogen sulfide, escaping from the reaction accommodating device into the absorption accommodating device 110. That is, in the case where both the oxidation-reduction potential and the discharge amount of hydrogen sulfide in the absorption-containing device 110 satisfy the requirements, the gas to be treated including hydrogen sulfide is introduced into the absorption-containing device 110, so that it is ensured that substantially all of the hydrogen sulfide gas introduced into the absorption-containing device 110 can interact with the absorbent in the absorption-containing device 110. Specifically, the first preset value and the second preset value may be respectively determined according to parameters such as the hydrogen sulfide inlet rate and the volume of the absorption accommodation device 110, and more specifically, the first preset value may be 270mV.
The second preset value may be determined according to an associated emission standard, and the second preset value may be zero.
In addition, the pH value of the liquid in the absorption and accommodation device can be detected, an auxiliary reference function is provided for the oxidation-reduction potential, and the detection accuracy of the residual amount of the absorbent in the absorption and accommodation device is further improved. More specifically, during the treatment of the hydrogen sulfide gas, the pH of the liquid in the absorption containment device may be controlled to be between 2.5 and 3.5. Regarding the redox potential, it is related to the concentration of iron sulfate in the absorbent, specifically, the concentration of iron sulfate may be 5% -20%, and the ORP value thereof is also different depending on the quality of iron sulfate. Based on this, in the process of treating the hydrogen sulfide gas, the ORP peak value can be set to about 320mV and the ORP valley value can be set to about 270 mV.
As described above, as the hydrogen sulfide and the absorbent react with each other, a precipitate may be generated, and based on this, in order to prevent the existence of the precipitate from adversely affecting the subsequent treatment process of the hydrogen sulfide gas, the treatment method disclosed in the embodiment of the present application may further include:
the first impurities including the sediment in the absorption receiving means 110 are collected. Specifically, the gas to be treated may be stopped by providing an opening at the bottom of the absorption housing means 110 and in case the amount of the precipitate is accumulated to a certain extent, and by opening the opening of the absorption housing means 110, the precipitate included is taken out from the absorption housing means 110 and the first impurities are collected in the first collecting means 510, and the first collecting means 510 may be specifically an iron sludge pond.
As the collected first impurities comprise the iron element and the sulfur element, the recycling of the iron element and the sulfur element can be realized by carrying out secondary treatment on the first impurities, and the treatment cost can be reduced while the green development is realized.
Of course, during the process of collecting the precipitate, the water or solution in the absorbing and holding device 110 may be taken out together with the precipitate, and then, the first impurity may further include a small amount of water or other substances. Alternatively, in order to reduce the content of the liquid in the collected first impurity as much as possible, a shut-off device such as a valve may be provided at the middle lower portion of the absorption receiving device 110, and the valve may be closed before the first impurity is collected, reducing the amount of the collected water.
Based on this, after the collection of the first impurity is completed, a part of the liquid still exists in the absorption and containment device 110, and the chemical reaction cannot reach absolute completeness and thoroughness, so that the liquid in the absorption and containment device 110 still contains iron ions and ferrous ions, so that the ferrous ions in the absorption and containment device 110 can be more efficiently utilized, and optionally, the treatment method disclosed in the embodiment of the present application further includes:
Oxidizing gas is introduced into the absorption housing device 110. Specifically, pure oxygen may be introduced into the absorption and accommodation device 110, or a gas having oxidizing ability such as chlorine may be introduced into the absorption and accommodation device 110. In order to reduce the cost and minimize the introduction of other elements into the absorber device 110, in one embodiment of the present application, after the collection of the sediment in the absorber device 110 is completed, the aerator 180 may be used to introduce air into the absorber device 110, where the cost of the air is relatively low, the oxygen content of the air is relatively high, the nitrogen in the air is not substantially involved in the chemical reaction in the absorber device 110, and the other gases in the air are less, and thus the operation process in the absorber device 110 is not substantially adversely affected.
The reaction process of oxygen and ferrous ions is as follows:
4FeSO 4 +O 2 +2H 2 SO 4 ＝2Fe 2 (SO4) 3 +2H 2 O
further, in order to achieve recycling of elemental sulfur and elemental iron in the first impurity, after collecting the first impurity including the precipitate in the absorption housing device 110, the treatment method disclosed in the embodiment of the present application may further include:
separating the precipitate from the first impurity to obtain a filtrate. Specifically, the precipitate in the first impurity may be separated by filtration or the like, and a filtrate is obtained. More specifically, the first impurities within the first collection device 510 may be treated with the plate and frame filter press 170 to filter press the precipitate into a solid sulfur-containing, iron-containing mud cake for recycling.
After obtaining the filtrate, the treatment method disclosed by the embodiment of the application can further comprise the following steps:
the filtrate is passed to a storage container in which an absorbent is stored. As described above, the absorbent may be introduced into the absorption housing device 110 by direct pouring or by pipe feeding. In this embodiment, a storage container may be specifically configured to store the absorbent, and the absorbent in the storage container may be introduced into the absorbent container 110 by using a pipeline transportation method. And, because the filtrate that first impurity was filtered out contains iron ion and ferrous ion to can be through setting up corresponding pipeline, and with the help of equipment such as delivery pump with the filtrate that first impurity was filtered out is carried in storing the storage holding device that stores the absorbent, retrieve the reuse to iron ion and ferrous ion in the filtrate, reduce the production of waste material on the one hand, on the other hand can also practice thrift the cost.
As described above, the wastewater may be specifically oil extraction wastewater, such wastewater generally further includes organic suspended impurities such as floating oil, etc., and for this purpose, such impurities in the wastewater may be further required to be removed, specifically, a coagulant may be used to destroy stability between suspended impurities and water molecules in the wastewater, and since the wastewater includes bicarbonate, after the wastewater is mixed with acid, the bicarbonate may react with acid to generate carbon dioxide gas, so that suspended impurities in the wastewater can be separated from water molecules in the wastewater and float to the surface of the liquid in the reaction container under the action of the gas along with generation of carbon dioxide gas based on the principle of air floatation, thereby achieving the purpose of treating suspended impurities in the wastewater.
In addition, because the carbon dioxide gas is generated by chemical reaction, the volume of bubbles generated in the liquid is smaller, the specific surface area is larger, the air floatation effect is better, and the treatment efficiency and the thoroughly degree of suspended impurities are higher.
Based on this, the above S1 may include:
acid, coagulant and wastewater are passed to a reaction containment device. In particular, similar to acids and waste water, the coagulant may also be introduced into the reaction containment means by pouring or by plumbing. In order to obtain better treatment effect of the wastewater in one treatment process as much as possible, the addition amount of the coagulant can be specifically 100ppm to 1000ppm.
In order to further promote the treatment effect to suspended impurity, still include:
a flocculant is mixed into the reaction containment device. Specifically, after acid, wastewater and coagulant are added into the reaction accommodating device, the flocculant is mixed into the reaction accommodating device in a dumping or pipeline conveying mode, flocculation efficiency and effect of suspended impurities in liquid are improved by using the flocculant, and treatment thoroughly degree of the suspended impurities is improved. Of course, the mixing uniformity of the components in the reaction accommodating device can be enhanced by stirring and the like, so that on one hand, the generation of gas is quickened, and on the other hand, suspended impurities in the wastewater can be more thoroughly treated. Of course, the degree of uniformity of mixing between the components in the reaction containment device may be enhanced by other means, not specifically illustrated herein.
Further, the treatment method disclosed in the embodiment of the application further comprises the following steps of:
and collecting second impurities including suspended impurities on the surface of the liquid to be discharged in the reaction-containing device. As described above, after the acid, the wastewater, the coagulant and the flocculant are all introduced into the reaction vessel to interact, hydrogen sulfide gas in the wastewater can escape, and suspended impurities flocculate with the escape of gas and float on the surface of the liquid, which causes the liquid remaining in the wastewater to form a liquid to be discharged. On this account, in order to provide a space for the waste water and the like which subsequently need to be continuously treated, the liquid to be discharged needs to be discharged from the reaction accommodating means, and, before the liquid to be discharged is discharged, the float on the surface of the liquid to be discharged needs to be treated.
Specifically, the collection purpose can be achieved by adsorbing the floats with oil absorbing paper or the like. In another embodiment of the present application, the floats on the surface of the wastewater can be collected by scraping with a slag scraping mechanism 140 or the like. Of course, during the process of collecting the floating objects, a small amount of the liquid to be discharged may be collected together, and further, the second impurities may include the floating objects and the liquid to be discharged. Accordingly, a second collecting device 520 may be provided at a corresponding position of the slag scraping mechanism 140, and in particular, the second collecting device 520 may be a dross floating oil pool to collect the second foreign matters including the floats scraped by the slag scraping mechanism 140 using the dross floating oil pool.
In addition, as described above, since the second impurity may contain a small amount of liquid, the liquid in the second impurity may be filtered out by filtration or the like to form a corresponding solid or near-solid impurity for convenience of subsequent processing. More specifically, the second impurity may be temporarily stored in the dross floating tank, then fed into the concentration tank 540 for concentration, and the solid oily sludge with a liquid content of 75% to 85% is removed by the spiral shell stacking machine 160, and then delivered to a unit with treatment qualification for treatment. Correspondingly, relatively few impurities are removed from the second impurities, and the liquid which does not substantially pollute the environment can be conveyed to the containing device which contains the liquid to be discharged.
Further, after collecting the second impurity, the embodiment of the present application may further include:
collecting the liquid to be discharged in the reaction container. Specifically, the liquid to be discharged in the reaction accommodating device can be conveyed to the third collecting device 530 in a pipeline conveying manner, the third collecting device 530 can be specifically a temporary storage tank, and the liquid to be discharged in the third collecting device 530 can be correspondingly detected, so that the liquid to be discharged is ensured to meet the discharge standard.
Based on the above process, optionally, the processing method disclosed in the embodiment of the present application may further include:
And neutralizing the liquid to be discharged under the condition that the pH value of the liquid to be discharged does not meet the preset range. As described above, in the process of treating hydrogen sulfide gas and suspended impurities by reacting acid with bicarbonate in wastewater to generate carbon dioxide, the reaction between acid and bicarbonate may not be complete, and thus, in order to ensure that the liquid to be discharged is substantially neutral, the ph of the liquid to be discharged needs to be adjusted. Based on this, the liquid to be discharged may be neutralized by detecting the PH of the liquid to be discharged and adding sodium hydroxide or dilute sulfuric acid, respectively.
Based on the treatment method disclosed in any embodiment, the embodiment of the application also discloses a treatment device for wastewater, which adopts the treatment method disclosed in any embodiment, and accordingly, the wastewater comprises bicarbonate and hydrogen sulfide, and the treatment device disclosed in the embodiment of the application comprises an absorption accommodating device 110 and a reaction accommodating device. Of course, in order to ensure reliable processing, a corresponding pipeline structure and the like are required to be arranged between the two.
Wherein the absorption containment device 110 is in communication with the first conduit such that the absorbent can be introduced into the absorption containment device 110 via the first conduit in preparation for the absorption containment device 110 to treat the hydrogen sulfide gas. Specifically, the first pipeline may be in communication with a hydrogen sulfide source, or the treatment apparatus disclosed in the embodiment of the present application may be further provided with an absorbent storage 340, and the first pipeline is made to communicate the absorbent storage 340 and the absorption capacity 110, so that the absorbent may be delivered into the absorption capacity 110 through the first pipeline.
Of course, in order to ensure that the hydrogen sulfide gas can react more thoroughly with the absorbent in the absorption and containment device 110, a pipeline communicating between the absorption and containment device 110 and the reaction and containment device may be connected at the bottom or middle lower part of the absorption and containment device 110; and, structures such as a gas equalizing member may be further disposed in the absorption and accommodation device 110, so as to further improve the thoroughly treated degree of the hydrogen sulfide gas.
Correspondingly, in order to ensure that both acid and waste water can be fed to the reaction holding means, the reaction holding means is in communication with the second conduit 200 and the third conduit, and waste water can be fed to the reaction holding means via the second conduit 200, and acid can be fed to the reaction holding means via the third conduit, thereby enabling the acid and waste water to react and interact within the reaction holding means.
More specifically, the ends of the second and third lines 200 and 200, respectively, facing away from the reaction containment device may be in communication with a source of wastewater and a source of acid, respectively. In another embodiment of the present application, the treatment apparatus may be further provided with a waste water storage member and an acid storage member 310 for storing waste water and acid, respectively.
And, as described above, the reaction-containing means communicates with the absorption-containing means 110 to introduce the gas to be treated including hydrogen sulfide, which escapes from the reaction-containing means, into the absorption-containing means 110, so that the gas to be treated can be subjected to a subsequent treatment process in the absorption-containing means 110. Of course, in order to ensure that the gas in the reaction vessel can be fed into the absorption vessel 110, one end of the pipe between the two may be connected above the reaction vessel, ensuring that the gas generated in the reaction vessel can be fed into the absorption vessel 110 through the pipe.
In addition, in order to optimize the treatment effect, a coagulant and a flocculant may be added to the reaction container in the treatment method disclosed in the above embodiment, and accordingly, a transfer line (and a reservoir) may be provided in the treatment apparatus disclosed in the embodiment of the present application. More specifically, the treatment apparatus further includes a coagulant reservoir 320 and a flocculant reservoir 330, which are respectively communicated with the reaction vessel through a fourth pipe and a fifth pipe, to add coagulant and flocculant into the reaction vessel.
Accordingly, the treatment method disclosed in the above embodiment further includes a process of collecting and solidifying the first impurity and the second impurity, and based on this, the treatment apparatus disclosed in the embodiment of the present application may further include a slag scraping mechanism 140, where the slag scraping mechanism 140 is disposed above the reaction container, and further in a case where the coagulant and the flocculant interact with the suspended impurity and form a float on the liquid surface of the reaction container, the float may be scraped off the liquid surface by the slag scraping mechanism 140 to form the second impurity including the float, and the second impurity is collected by the second collecting device 520. Specifically, the second collecting device 520 may be a floating oil pool for dross, and the second collecting device 520 may be disposed correspondingly according to the installation position of the dross scraping mechanism 140, and may particularly be disposed on the discharge side of the dross scraping mechanism 140, so as to achieve the purpose of collecting the second impurities including the floating matters on the surface of the liquid to be discharged in the reaction container.
Accordingly, after the gas to be treated is introduced into the absorption and containment device 110, the hydrogen sulfide may react with the absorbent to generate a precipitate, and in order to prevent the influence of the precipitate on the subsequent treatment process in the absorption and containment device 110, the precipitate may be collected in the treatment method, and therefore, the treatment apparatus disclosed in the embodiment of the present application may further include a first collecting device 510, where the first collecting device 510 may be connected to the bottom of the absorption and containment device 110, and the first impurity including the precipitate in the absorption and containment device 110 is collected by using the first collecting device 510.
More specifically, a valve may be provided in the absorption capacity 110 to separate the sediment generated in the absorption capacity 110 from the solution as much as possible by means of the valve, thereby minimizing the amount of the solution separated from the absorption capacity 110 during the process of collecting the sediment. Also, a cone hopper may be provided at the bottom of the absorption housing means 110, and the collection work may be performed on the sediment before the amount of sediment deposited in the cone hopper does not exceed 2/3 of its volume. In addition, the continuation of the gas to be treated into the absorption containing device 110 needs to be stopped before the process of collecting the precipitate, and the collection work can be performed by allowing the precipitate to stand for a certain period of time to further reduce the amount of liquid separated from the inside of the absorption containing device 110. It should be noted that, due to relatively poor stability of the iron ions, a large amount of precipitates may be formed with the increase of the standing time, resulting in a large loss of the iron ions in the absorbing and holding device 110, and based on this, the standing time is not suitable to be too long, and may be in the range of twenty-five minutes.
Further, in the treatment method disclosed in the above embodiment, the first impurity and the second impurity also need to be solidified, so that the treatment device disclosed in the embodiment of the application may further include a concentration tank 540 and a spiral shell stacking machine 160, and the second impurity may be concentrated by the concentration tank 540 and then concentrated into solid sludge by the spiral shell stacking machine 160. And for the first impurity, the first impurity contains rich sulfur and iron, so that the precipitate in the first impurity can be filtered, and the solid impurity can be recycled through subsequent treatment. Specifically, the treatment device disclosed in the embodiment of the present application may further include an iron mud tank and a plate-and-frame filter press 170, where the first impurity collected in the self-absorption accommodating device 110 may be stored in the iron mud tank, and then the first impurity is processed by using the plate-and-frame filter press 170, and solid mud cakes containing sulfur and iron are filtered and filtered to realize resource recycling, and since the filtrate produced by filtering the first impurity contains iron ions and ferrous ions, the filtrate of the first impurity may be then conveyed back to the absorbent storage 340 through a pipeline for continuous use.
In addition, as described above, the treatment apparatus disclosed in the embodiment of the present application may further include an aerator 180, after the absorption and accommodation device 110 completes the collection of the first impurity, air may be blown into the absorption and accommodation device 110 through the aerator 180, and the oxygen in the air is utilized to oxidize the ferrous ions remained in the absorption and accommodation device 110, so that the oxidation capability of the ferrous ions is recovered, and the treatment capability of the ferrous ions on hydrogen sulfide is improved.
Of course, since the precipitate in the first impurity necessarily includes iron element, then as the treatment work of the hydrogen sulfide gas proceeds, it is necessary to supplement the absorbent into the absorption housing device 110. Based on this, the treatment method disclosed in the above embodiment can determine whether the absorbent needs to be replenished into the absorption and accommodation device 110 (or whether the gas to be treated can be continuously introduced into the absorption and accommodation device 110) by detecting the oxidation-reduction potential of the liquid in the absorption and accommodation device 110, detecting the content of hydrogen sulfide in the exhaust gas discharged from the exhaust port of the absorption and accommodation device 110, and the like. Specifically, in the treatment apparatus disclosed in the embodiment of the present application, an OPR detecting mechanism may be installed in the absorption containing device 110 to detect the oxidation-reduction potential of the liquid in the absorption containing device 110; in order to further improve the accuracy of detecting the remaining amount of the absorbent in the absorption housing device 110, a pH detecting means may be provided in the absorption housing device 110 to detect the pH of the liquid in the absorption housing device 110, together with the oxidation-reduction potential, as a criterion for judging the content of the absorbent in the absorption housing device 110. Similarly, in the treatment apparatus disclosed in the embodiment of the present application, the exhaust port of the absorption and accommodation device 110 may be further provided with a hydrogen sulfide detection mechanism, so as to detect the content of hydrogen sulfide in the exhaust gas discharged from the exhaust port, and correspondingly control whether to continue to introduce the gas to be treated including hydrogen sulfide into the absorption and accommodation device 110 (or whether to supplement the absorbent into the absorption and accommodation device 110) according to the detected value.
Similarly, the filtrate from the second impurity filtering may also be fed back into the second collection device 520 containing the liquid to be discharged. And, after the relevant detection of the liquid to be discharged, the liquid to be discharged is discharged as prescribed. Of course, in order to further secure the cleanliness of the liquid to be discharged, the treatment apparatus disclosed in the embodiment of the present application may further include a filtering mechanism 150 to filter the liquid to be discharged before it is discharged. Optionally, the treatment apparatus disclosed in the embodiment of the present application may further include a ph adjuster storage 350, where the ph adjuster storage 350 is capable of storing an acidic adjuster and/or an alkaline adjuster, and the ph adjuster storage 350 is in communication with the second collecting device 520 through a pipeline, so that before discharging (or filtering) the liquid to be discharged, the ph adjuster is correspondingly added to the liquid to be discharged according to the ph of the liquid to be discharged, so as to neutralize the liquid to be discharged.
Optionally, as shown in fig. 2, in the treatment device disclosed in the embodiment of the present application, the reaction accommodating device includes a pressure-bearing reaction kettle 121, a water distributor 122 and an air floatation tank 123, where the pressure-bearing reaction kettle 121 is communicated with a third pipeline of the second pipeline 200 and the water distributor 122, and the water distributor 122 is disposed in the air floatation tank 123. That is, the wastewater and the acid are respectively transferred to the pressure-bearing reaction kettle 121 through the second pipeline 200 and the third pipeline, and the mixed liquid formed by the two can be transferred to the air floatation tank 123 through the water distributor 122. The pressure-bearing reaction kettle 121 can maximally inhibit the escape amount of carbon dioxide gas generated by the reaction of acid and bicarbonate, and further, after a mixed liquid in which a large amount of carbon dioxide gas is dissolved is conveyed into the air floatation tank 123 through the water distributor 122, the escape rate of carbon dioxide gas dissolved in the liquid is increased due to the pressure reduction, and the escape rate of hydrogen sulfide gas can be accelerated.
Meanwhile, the air bearing tank 123 communicates with the absorption capacity 110, so that the gas generated in the air bearing tank 123 can be transferred into the absorption capacity 110. Specifically, as described above, it is possible to communicate the other end of the piping with the absorption capacity device 110 by providing the piping above the air-floating tank 123. In another embodiment of the present application, a gas collecting cap 124 may be disposed above the air floating pond 123, and the top end of the gas collecting cap 124 is communicated with the absorption housing device 110 through a pipe, which may improve the reliability of the transportation of the gas.
In addition, considering that the acid and the wastewater in the pressure-bearing reaction kettle 121 react with each other to generate gas, so that the pressure in the pressure-bearing reaction kettle 121 is relatively high, in order to stably introduce the acid and the wastewater into the pressure-bearing reaction kettle 121, the acid and the wastewater can be conveyed into the pressure-bearing reaction kettle 121 in a high-pressure jet manner, and a check valve is arranged on a pipeline to prevent liquid from flowing back. Under the condition of adopting the technical scheme, on one hand, the feeding working efficiency can be improved, the mixing uniformity degree between the acid and the wastewater can also be improved, and the reaction sufficiency degree between the acid and bicarbonate can be further improved.
In addition, in the case of adopting the technical scheme disclosed in the embodiment of the application, the pipeline mixer 130 may be disposed on the communicating pipeline between the pressure-bearing reaction kettle 121 and the water distributor 122, and the flocculant storage element 330 is communicated with the pipeline mixer 130, so that the flocculant is added into the liquid in the process of conveying the liquid in the pressure-bearing reaction kettle 121 to the water distributor 122, and the flocculation effect of impurities in the liquid is improved.
As described above, bicarbonate in acid and wastewater can react with each other in the pressure-bearing reaction kettle 121 and generate gas, so that in order to ensure higher safety in the treatment process, the top of the pressure-bearing reaction kettle 121 can be communicated with the absorption and accommodation device 110 through a pressure release valve, and therefore, under the condition that the pressure in the pressure-bearing reaction kettle 121 exceeds the preset pressure value of the pressure release valve, the pressure-bearing reaction kettle 121 and the absorption and accommodation device 110 can be communicated by using the pressure release valve, the gas in the pressure-bearing reaction kettle 121 is directly conveyed into the absorption and accommodation device 110, the pressure in the pressure-bearing reaction kettle 121 is reduced, and the safety in the treatment process is ensured to be relatively higher. Specifically, the opening and closing pressure values of the pressure relief valve may be determined according to the specific situation of the pressure-bearing reaction kettle 121, which is not limited herein.
As described above, since the reaction of the hydrogen sulfide with the absorbent may generate a precipitate, and the gas to be treated needs to be stopped from being introduced into the absorption and containment device 110 during the process of collecting the precipitate, the treatment work of the gas to be treated may be stagnant, which is unfavorable for the smooth progress of the treatment work. Based on this, in the treatment apparatus disclosed in the embodiment of the present application, the absorption housing means 110 may include a first absorption housing means and a second absorption housing means, and both the first absorption housing means and the second absorption housing means are in communication with the reaction housing means and the first pipe. In this case, the absorbent can be fed into the first and second absorption housing means via the first line, respectively, so that both the first and second absorption housing means can treat the gas to be treated. In this case, the first absorption capacity device and the second absorption capacity device may be alternately subjected to the gas treatment operation.
Specifically, in the process that the gas to be treated is introduced into the first absorption and accommodation device, the sediment in the second absorption and accommodation device can be collected, after the collection work of the first impurity is completed, the ferrous ions in the second absorption and accommodation device are subjected to aeration oxidation, and then the gas to be treated generated in the reaction and accommodation device can be introduced into the second absorption and accommodation device, the sediment generated in the first absorption and accommodation device is collected, and the ferrous ions in the first absorption and accommodation device are subjected to aeration oxidation. The circulation is repeated, so that the gas to be treated in the reaction accommodating device can be correspondingly conveyed to the corresponding part for treatment, the interruption of the treatment process is avoided, and the treatment efficiency and the continuity can be improved.
The foregoing embodiments of the present application mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in view of brevity of line text, no further description is provided herein.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (9)
1. A method of treating wastewater comprising bicarbonate and hydrogen sulfide, the method comprising:
introducing acid and the wastewater into a reaction accommodating device, reacting the wastewater with the acid to generate carbon dioxide gas, and allowing dissolved hydrogen sulfide gas to escape out of the liquid along with the generation of the carbon dioxide gas;
passing an absorbent comprising ferric sulphate and/or ferrous sulphate into an absorption containment means;
detecting the oxidation-reduction potential of the liquid in the absorption accommodation device;
detecting the content of hydrogen sulfide in the exhaust gas discharged from the exhaust port of the absorption accommodation device;
and under the condition that the oxidation-reduction potential exceeds a first preset value and the content of the hydrogen sulfide does not exceed a second preset value, introducing the gas to be treated, which comprises the hydrogen sulfide and escapes from the reaction accommodating device, into the absorption accommodating device.
2. The processing method according to claim 1, characterized in that the processing method further comprises:
collecting a first impurity including a precipitate in the absorption containment device;
and introducing oxidizing gas to the absorption and accommodation device.
3. The method of processing according to claim 2, wherein after the collecting the first impurity including the precipitate in the absorption housing device, further comprising:
Separating the precipitate from the first impurity to obtain a filtrate;
and passing the filtrate into a storage and accommodation device in which the absorbent is stored.
4. The process of claim 1, wherein the wastewater further comprises suspended impurities, wherein the passing the acid and the wastewater to a reaction containment device comprises:
introducing acid, coagulant and the wastewater into a reaction accommodating device;
mixing a flocculant into the reaction containment device;
and collecting second impurities including floats on the surface of the liquid to be discharged in the reaction accommodating means.
5. The method of processing according to claim 4, further comprising:
collecting the liquid to be discharged in the reaction accommodating means;
and neutralizing the liquid to be discharged under the condition that the pH value of the liquid to be discharged does not meet a preset range.
6. A treatment apparatus for wastewater comprising bicarbonate and hydrogen sulfide, employing the treatment method according to any one of claims 1 to 5, characterized in that the treatment apparatus comprises:
the absorption and accommodation device is communicated with a first pipeline, and the absorbent is introduced into the absorption and accommodation device through the first pipeline;
The reaction accommodating device is communicated with a second pipeline and a third pipeline, the wastewater is introduced into the reaction accommodating device through the second pipeline, the acid is introduced into the reaction accommodating device through the third pipeline, and the reaction accommodating device is communicated with the absorption accommodating device so as to introduce the gas to be treated, which is escaped from the reaction accommodating device and comprises hydrogen sulfide, into the absorption accommodating device.
7. The treatment device according to claim 6, wherein the reaction accommodating means comprises a pressure-bearing reaction kettle, a water distributor and an air floatation tank, the second pipeline, the third pipeline and the water distributor are all communicated with the pressure-bearing reaction kettle, the water distributor is arranged in the air floatation tank, and the air floatation tank is communicated with the absorption accommodating means.
8. The treatment device according to claim 7, wherein the top of the pressure-bearing reaction kettle is communicated with the absorption accommodation device through a pressure relief valve.
9. The processing apparatus of claim 6 wherein said absorption containment means comprises first and second absorption containment means, each in communication with said reaction containment means and said first conduit.
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| CN202210171033.7A CN114436387B (en) | 2022-02-23 | 2022-02-23 | Method and apparatus for treating wastewater |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB436218A (en) * | 1933-04-07 | 1935-10-03 | Gustaf Henrik Hultman | Improvements in processes for purifying gases containing hydrogen sulphide from hydrogen sulphide |
| CH342466A (en) * | 1956-02-14 | 1959-11-15 | Escher Wyss Ag | Process for the regeneration of sodium sulfite and soda from a black liquor |
| FR2144007A5 (en) * | 1971-06-28 | 1973-02-09 | Cit Alcatel | |
| ITMI20022705A1 (en) * | 2002-12-20 | 2004-06-21 | Enitecnologie Spa | ORGANIC CHEMICAL PROCESS FOR THE DESULFURATION OF H2S CONTAINING GASEOUS CURRENTS. |
| CN102992507A (en) * | 2011-09-15 | 2013-03-27 | 四川仁智石化科技有限责任公司 | Oil and gas field high-sulfur-content waste water processing method |
| CN105217837B (en) * | 2015-10-14 | 2017-06-30 | 童青松 | A kind of processing method containing element sulphur waste water |
| US10661220B2 (en) * | 2018-02-27 | 2020-05-26 | Merichem Company | Hydrogen sulfide removal process |
| CN113247982B (en) * | 2021-06-07 | 2021-09-17 | 赛恩斯环保股份有限公司 | High-sulfur wastewater recycling treatment method and system |
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