CN115286166A - Advanced treatment method for medium-high concentration coal gasification fluorine-containing wastewater - Google Patents
Advanced treatment method for medium-high concentration coal gasification fluorine-containing wastewater Download PDFInfo
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- 239000011737 fluorine Substances 0.000 title claims abstract description 80
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 80
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000003245 coal Substances 0.000 title claims abstract description 44
- 238000002309 gasification Methods 0.000 title claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
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- 239000006228 supernatant Substances 0.000 claims abstract description 34
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- 238000011084 recovery Methods 0.000 claims abstract description 21
- 238000010517 secondary reaction Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000004064 recycling Methods 0.000 claims abstract description 13
- 238000004062 sedimentation Methods 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000012065 filter cake Substances 0.000 claims abstract description 6
- 239000000706 filtrate Substances 0.000 claims abstract description 6
- 230000005389 magnetism Effects 0.000 claims abstract description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 66
- 239000006247 magnetic powder Substances 0.000 claims description 38
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 21
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 21
- 239000004571 lime Substances 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 238000006115 defluorination reaction Methods 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 10
- -1 fluoride ions Chemical class 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 239000008267 milk Substances 0.000 claims description 5
- 210000004080 milk Anatomy 0.000 claims description 5
- 235000013336 milk Nutrition 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 5
- 239000003463 adsorbent Substances 0.000 description 5
- 239000003651 drinking water Substances 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
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- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 206010016818 Fluorosis Diseases 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- 244000017020 Ipomoea batatas Species 0.000 description 1
- 235000002678 Ipomoea batatas Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 210000001185 bone marrow Anatomy 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000004042 dental fluorosis Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000009713 electroplating Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention discloses a method for deeply treating medium-high concentration coal gasification fluorine-containing wastewater. Firstly, inputting coal gasification fluorine-containing wastewater into a primary reaction tank for reaction and flocculation, automatically flowing the obtained wastewater into a primary sedimentation tank for solid-liquid separation, and separating to obtain supernatant and magnetic sludge; the obtained supernatant automatically flows to a secondary reaction tank for reaction and flocculation, and the flocculated wastewater automatically flows to a secondary sedimentation tank for solid-liquid separation to obtain supernatant and sludge containing magnetism; the obtained supernatant overflows to an external drainage pool for collection, and then is discharged to a circulating water system for recycling; the two parts of the obtained magnetic sludge are respectively returned to the first-stage reaction tank and the second-stage reaction tank for cyclic utilization after being treated by the first-stage magnetic recovery system and the second-stage magnetic recovery system; and (3) dehydrating the two strands of demagnetized sludge, feeding the obtained filtrate into a first-stage reaction tank for circular treatment, and using the obtained filter cake as a wall material. The invention has simple operation, good treatment effect and high treatment efficiency.
Description
1. The technical field is as follows:
the invention relates to a method for treating fluorine-containing wastewater, in particular to a method for deeply treating medium-high concentration coal gasification fluorine-containing wastewater.
2. Background art:
fluorine is a non-metallic chemical element. Elemental fluorine is F 2 It is a light yellow and extremely toxic gas. Fluorine gas is very corrosive, has extremely active chemical properties, is one of the most oxidizing substances, and can even react with part of inert gas under certain conditions. The fluoride refers to an organic or inorganic compound containing negative fluorine, and industrial wastewater in industries such as nonferrous metallurgy, glass, electroplating, pharmacy, circuit boards and the like contains a large amount of fluoride, and if the fluoride is not treated, the fluoride can cause serious harm to the environment and human bodies.
Elemental fluorine is present in about 2 to 3 grams in normal adult humans, and is distributed primarily in bones and teeth, where about 90% of the fluorine is stored. Fluorine required by the human body comes mainly from drinking water. Trace fluorine is beneficial to preventing dental caries, and if the fluorine content in water is less than 0.5ppm, the incidence rate of dental caries can reach 70-90%. However, if the fluorine content in the drinking water exceeds 1ppm, the teeth are gradually spotted and become brittle; when the fluorine content in drinking water exceeds 4ppm, the human is susceptible to fluorosis, resulting in bone marrow malformation.
At present, the treatment methods of high-concentration fluorine-containing wastewater at home and abroad are various, and an adsorption method and a precipitation method are common. Wherein, the precipitation method is mainly applied to the treatment of industrial fluorine-containing wastewater, and the adsorption method is mainly applied to the treatment of drinking water. The chemical precipitation method is mainly applied to the treatment of high-concentration fluorine-containing wastewater, adopts a calcium salt precipitation method, namely a lime precipitation method, and adds chemical medicines such as calcium salt and the like into the wastewater to enable calcium ions to react with fluorine ions to generate CaF 2 Precipitating to remove F in wastewater - The purpose of (1). The process is simple and convenient, and has low cost, but has the following defects: after the fluorine content in the treated wastewater reaches 10-25 mg/L, lime water is added, and precipitates are difficult to form again. Therefore, the method is generally suitable for the first-stage treatment reaction of high-concentration fluorine-containing wastewater. The adsorption method is to put equipment containing adsorbents such as activated alumina, polyaluminium salt, lignite adsorbent, functional fiber adsorbent, activated carbon and the like into industrial wastewater, and to remove fluorine ions by performing a special or conventional ion exchange or chemical reaction with a solid medium and finally adsorbing the fluorine ions on the adsorbents. But in order to ensure the treatment effect, the pH value of the wastewater is not too high and is generally controlled to be about 5; in addition, the adsorption temperature of the adsorbent cannot be too high.
In order to protect the ecological environment, the research of defluorination of fluorine-containing wastewater is an important task in the environmental protection and sanitation fields at home and abroad. In the treatment of the fluorine-containing wastewater, factors such as the water quantity of the fluorine-containing wastewater, the concentration of fluorine ions in inlet and outlet water, field facilities, comprehensive treatment cost and the like need to be comprehensively considered, and a proper method is selected to treat the fluorine-containing water so as to reach the national discharge standard.
3. The invention content is as follows:
the technical problem to be solved by the invention is as follows: according to the current situation of the fluorine-containing wastewater treatment, the invention provides the advanced treatment method of the medium-high concentration coal gasification fluorine-containing wastewater, which has the advantages of simple operation, good treatment effect and high treatment efficiency.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides a deep treatment method of medium-high concentration coal gasification fluorine-containing wastewater, which comprises the following steps:
a. inputting the coal gasification fluorine-containing wastewater into a first-stage reaction tank for reaction and flocculation, wherein the first-stage reaction tank is divided into three grids, lime is added into the first grid, magnetic powder is added into the second grid, and Polyacrylamide (PAM) is added into the third grid;
b. b, automatically flowing the wastewater obtained after flocculation in the step a to a primary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
c. b, enabling the supernatant obtained in the step b to automatically flow to a secondary reaction tank for reaction and flocculation, wherein the secondary reaction tank is divided into three grids, the first grid is added with a defluorination agent solution, the second grid is added with magnetic powder, and the third grid is added with Polyacrylamide (PAM);
d. c, automatically flowing the wastewater obtained after flocculation in the step c to a secondary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
e. d, overflowing the supernatant obtained in the step d to an external drainage pool for collection, and then pumping the supernatant to a circulating water system for recycling;
f. b, treating the sludge containing the magnetism obtained in the step d by a primary magnetic recovery system and a secondary magnetic recovery system respectively, and returning the obtained magnetic powder to the primary reaction tank and the secondary reaction tank respectively for recycling; and (3) allowing the demagnetized two sludge flows to a sludge storage tank, pumping the sludge to a plate-and-frame filter press for dehydration, feeding the obtained filtrate to a first-stage reaction tank for circular treatment, and using the obtained filter cake as a wall material.
According to the advanced treatment method of the coal gasification fluorine-containing wastewater with medium and high concentration, the fluorine content in the coal gasification fluorine-containing wastewater in the step a is less than or equal to 60mg/L.
According to the advanced treatment method of the medium-high concentration coal gasification fluorine-containing wastewater, the fluorine content in the coal gasification fluorine-containing wastewater in the step a is 30-60 mg/L.
According to the advanced treatment method of the coal gasification fluorine-containing wastewater with medium and high concentration, the adding amount of the lime in the step a is 1120-1350g/m 3 The addition amount of the magnetic powder in the waste water is 23-28 g/m 3 The addition amount of the polyacrylamide PAM is 1.5-2.0 g/m 3 And (4) waste water.
According to the advanced treatment method of the coal gasification fluorine-containing wastewater with medium and high concentration, lime milk with the concentration of 10wt% is prepared before the lime is added in the step a; preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; and the pH value in the first-stage reaction tank is controlled to be 12.
According to the advanced treatment method of the coal gasification fluorine-containing wastewater with medium and high concentration, the addition amount of the defluorinating agent solution in the step c is 2080 to 2500g/m 3 The addition amount of the magnetic powder is 45-56 g/m 3 The addition amount of the polyacrylamide PAM is 3-4 g/m 3 Waste water; the concentration of the defluorinating agent solution is 20-30 wt%.
According to the advanced treatment method of the medium-high concentration coal gasification fluorine-containing wastewater, the polyacrylamide PAM is prepared into a solution with the concentration of 1 wt% per mill before being added; and the pH value in the secondary reaction tank is controlled to be 6-7.
According to the advanced treatment method of the coal gasification fluorine-containing wastewater with medium and high concentration, the fluorine removal medicament in the step c is provided by Shandong Guangying New Material science and technology Co.
According to the advanced treatment method of the medium-high concentration coal gasification fluorine-containing wastewater, the molecular weight of the polyacrylamide PAM is 800-1000 ten thousand.
According to the advanced treatment method of the coal gasification fluorine-containing wastewater with medium and high concentration, the fluorine ions in the discharged supernatant in the step e are less than or equal to 1mg/L, the pH value is 6-7, and the turbidity is less than 10NTU.
In the technical scheme of the invention, the magnetic recovery system comprises a front high shear and a magnetic powder recovery device. The high shearing machine crushes the large-particle sludge to release the wrapped magnetic powder, the magnetic powder is further adsorbed and separated by the roller of the magnetic powder recovery device, and the high-efficiency recycling of the magnetic powder is realized.
The invention has the following positive beneficial effects:
1. the treatment method of the invention uses high-efficiency magnetic powder, which not only ensures the effluent quality, but also reduces the operation cost. The magnetic powder recovery system comprises the preposed high shear and the magnetic powder recovery device, the high shear breaks large-particle sludge to release coated magnetic powder, and the magnetic powder is further adsorbed and separated by the roller of the magnetic powder recovery device, so that the high-efficiency recovery and utilization of the magnetic powder are realized.
2. In the wastewater treated by the advanced treatment method, the fluorine ions are less than or equal to 1mg/L, the pH is 6-7, the turbidity is less than 10NTU, and the wastewater is directly recycled to a circulating water system, so that the sewage discharge is reduced, and the recycling of the wastewater is realized. The amount of the wastewater recovered per day by the treatment method of the invention is about 6000 to 7200m 3 。
3. The advanced treatment method integrates the processes of reaction, coagulation, magnetic powder recovery, flocculation clarification and sludge recovery, has the advantages of convenient operation, high treatment efficiency and the like, and completely realizes the standard discharge of wastewater treatment.
4. Description of the drawings:
FIG. 1 is a schematic process flow diagram of the advanced treatment method of high-concentration coal gasification fluorine-containing wastewater in the invention.
5. The specific implementation mode is as follows:
the invention is further illustrated by the following examples, which do not limit the scope of the invention.
The molecular weight of polyacrylamide PAM adopted in the following examples is 800-1000 ten thousand, and the fluorine removal medicament is provided by Guangying New Material science and technology Limited, shandong.
Example 1:
the method for the advanced treatment of the high-concentration coal gasification fluorine-containing wastewater comprises the following detailed steps (the coal gasification fluorine-containing wastewater treated by the embodiment is produced by a gas (group) of Henan province, ipomoea batatas, ltd., and the fluorine content in the wastewater is 60 mg/L):
a. inputting the coal gasification fluorine-containing wastewater into a first-stage reaction tank for reaction and flocculation, wherein the first-stage reaction tank is divided into three grids, lime is added into the first grid, magnetic powder is added into the second grid, and Polyacrylamide (PAM) is added into the third grid; 250m of wastewater is treated per hour 3 Carrying out operation;
the addition amount of the lime is 1350g/m 3 Waste water, wherein the adding amount of the magnetic powder is 28g/m 3 The addition amount of the polyacrylamide PAM is 2.0g/m 3 Waste water;
lime milk with the concentration of 10wt% is prepared before the lime is added; preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; controlling the pH value in the primary reaction tank to be 12;
b. b, automatically flowing the wastewater obtained after flocculation in the step a to a primary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
c. b, enabling the supernatant obtained in the step b to automatically flow to a secondary reaction tank for reaction and flocculation, wherein the secondary reaction tank is divided into three grids, the first grid is added with a defluorination agent solution, the second grid is added with magnetic powder, and the third grid is added with Polyacrylamide (PAM);
the addition amount of the defluorinating agent solution is 2500g/m 3 Waste water, the adding amount of the magnetic powder is 56g/m 3 The addition amount of the polyacrylamide PAM is 4g/m 3 Waste water; the concentration of the defluorination agent solution is 20wt%; preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; controlling the pH value in the secondary reaction tank to be 6-7;
d. c, automatically flowing the wastewater obtained after flocculation in the step c to a secondary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
e. d, overflowing the supernatant obtained in the step d to an external drainage pool for collection, and then pumping the supernatant to a circulating water system for recycling;
f. b, treating the sludge containing the magnetism obtained in the step d by a primary magnetic recovery system and a secondary magnetic recovery system respectively, and returning the obtained magnetic powder to the primary reaction tank and the secondary reaction tank respectively for recycling; and (3) allowing the demagnetized two sludge flows to a sludge storage tank, pumping the sludge to a plate-and-frame filter press for dehydration, feeding the obtained filtrate to a first-stage reaction tank for circular treatment, and using the obtained filter cake as a wall material.
In the effluent treated in this example (i.e., the supernatant discharged in step e), the content of fluoride ions was 1mg/L, pH was 6, and turbidity was 9NTU.
Example 2:
the method for the advanced treatment of the high-concentration coal gasification fluorine-containing wastewater comprises the following detailed steps (the coal gasification fluorine-containing wastewater treated by the embodiment is produced by Yima coal industry comprehensive energy New energy Limited liability company, and the fluorine content in the wastewater is 56 mg/L):
a. inputting the coal gasification fluorine-containing wastewater into a first-stage reaction tank for reaction and flocculation, wherein the first-stage reaction tank is divided into three grids, lime is added into the first grid, magnetic powder is added into the second grid, and Polyacrylamide (PAM) is added into the third grid; according to the treatment of 300m of wastewater per hour 3 Carrying out operation;
the addition amount of the lime is 1125g/m 3 Waste water, the adding amount of the magnetic powder is 23g/m 3 The addition amount of the polyacrylamide PAM is 1.67g/m 3 Waste water;
lime milk with the concentration of 10wt% is prepared before the lime is added; preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; controlling the pH value in the primary reaction tank to be 12;
b. b, automatically flowing the wastewater obtained after flocculation in the step a to a primary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
c. b, enabling the supernatant obtained in the step b to automatically flow to a secondary reaction tank for reaction and flocculation, wherein the secondary reaction tank is divided into three grids, the first grid is added with a defluorination agent solution, the second grid is added with magnetic powder, and the third grid is added with Polyacrylamide (PAM);
the addition amount of the defluorination agent solution is 2083g/m 3 The addition amount of the magnetic powder is 46.3g/m 3 The addition amount of the polyacrylamide PAM is 3.3g/m 3 Waste water; the concentration of the defluorination agent solution is 30wt%; preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; controlling the pH value in the secondary reaction tank to be 6-7;
d. c, automatically flowing the wastewater obtained after flocculation in the step c to a secondary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
e. d, overflowing the supernatant obtained in the step d to an external drainage pool for collection, and then pumping the supernatant to a circulating water system for recycling;
f. b, treating the sludge containing the magnetism obtained in the step d by a primary magnetic recovery system and a secondary magnetic recovery system respectively, and returning the obtained magnetic powder to the primary reaction tank and the secondary reaction tank respectively for recycling; and (3) allowing the demagnetized two sludge flows to a sludge storage tank, pumping the sludge to a plate-and-frame filter press for dehydration, feeding the obtained filtrate to a first-stage reaction tank for circular treatment, and using the obtained filter cake as a wall material.
In the effluent treated in this example (i.e., the supernatant discharged in step e), the fluoride ion content was 0.87mg/L, the pH was 7, and the turbidity was 8NTU.
Example 3:
the advanced treatment method of the high-concentration coal gasification fluorine-containing wastewater comprises the following detailed steps (the coal gasification fluorine-containing wastewater treated in the embodiment is produced by the integrated energy new energy company of the coal industry of the Emma, and the fluorine content in the wastewater is 52 mg/L):
a. inputting the coal gasification fluorine-containing wastewater into a first-stage reaction tank for reaction and flocculation, wherein the first-stage reaction tank is divided into three grids, lime is added into the first grid, magnetic powder is added into the second grid, and Polyacrylamide (PAM) is added into the third grid; the wastewater is treated by 270m per hour 3 Carrying out operation;
the addition amount of the lime is 1250g/m 3 The addition amount of the magnetic powder in the wastewater is 25.7g/m 3 The addition amount of the polyacrylamide PAM is 1.85g/m 3 Waste water;
lime milk with the concentration of 10wt% is prepared before the lime is added; preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; controlling the pH value in the primary reaction tank to be 12;
b. b, automatically flowing the wastewater obtained after flocculation in the step a to a primary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
c. b, enabling the supernatant obtained in the step b to automatically flow to a secondary reaction tank for reaction and flocculation, wherein the secondary reaction tank is divided into three grids, the first grid is added with a defluorination agent solution, the second grid is added with magnetic powder, and the third grid is added with Polyacrylamide (PAM);
the defluorinating agent is dissolvedThe amount of the added liquid is 2314g/m 3 Waste water, the adding amount of the magnetic powder is 51.4g/m 3 The addition amount of the polyacrylamide PAM is 3.7g/m 3 Waste water; the concentration of the defluorination agent solution is 25wt%; preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; controlling the pH value in the secondary reaction tank to be 6-7;
d. c, automatically flowing the wastewater obtained after flocculation in the step c to a secondary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
e. d, overflowing the supernatant obtained in the step d to an external drainage pool for collection, and then pumping the supernatant to a circulating water system for recycling;
f. b, treating the sludge containing the magnetism obtained in the step d by a primary magnetic recovery system and a secondary magnetic recovery system respectively, and returning the obtained magnetic powder to the primary reaction tank and the secondary reaction tank respectively for recycling; and (3) allowing the demagnetized two sludge flows to a sludge storage tank, pumping the sludge to a plate-and-frame filter press for dehydration, feeding the obtained filtrate to a first-stage reaction tank for circular treatment, and using the obtained filter cake as a wall material.
In the effluent treated in this example (i.e., the supernatant discharged in step e), the content of fluoride ions was 0.93mg/L, pH was 7, and turbidity was 10NTU.
Claims (10)
1. The advanced treatment method for the medium-high concentration coal gasification fluorine-containing wastewater is characterized by comprising the following steps:
a. inputting the coal gasification fluorine-containing wastewater into a first-stage reaction tank for reaction and flocculation, wherein the first-stage reaction tank is divided into three grids, lime is added into the first grid, magnetic powder is added into the second grid, and Polyacrylamide (PAM) is added into the third grid;
b. b, automatically flowing the wastewater obtained after flocculation in the step a to a primary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
c. b, enabling the supernatant obtained in the step b to automatically flow to a secondary reaction tank for reaction and flocculation, wherein the secondary reaction tank is divided into three grids, the first grid is added with a defluorination agent solution, the second grid is added with magnetic powder, and the third grid is added with Polyacrylamide (PAM);
d. c, automatically flowing the wastewater obtained after flocculation in the step c to a secondary sedimentation tank for solid-liquid separation to obtain supernatant and magnetic sludge;
e. d, overflowing the supernatant obtained in the step d to an external drainage pool for collection, and then pumping the supernatant to a circulating water system for recycling;
f. b, treating the sludge containing the magnetism obtained in the step d by a primary magnetic recovery system and a secondary magnetic recovery system respectively, and returning the obtained magnetic powder to the primary reaction tank and the secondary reaction tank respectively for recycling; and (3) allowing the demagnetized two sludge flows to a sludge storage tank, pumping the sludge to a plate-and-frame filter press for dehydration, feeding the obtained filtrate to a first-stage reaction tank for circular treatment, and using the obtained filter cake as a wall material.
2. The advanced treatment method of the high-concentration coal gasification wastewater containing fluorine according to claim 1, characterized in that: in the step a, the fluorine content in the coal gasification fluorine-containing wastewater is less than or equal to 60mg/L.
3. The advanced treatment method for the high-concentration coal gasification fluorine-containing wastewater according to claim 2, characterized in that: the fluorine content in the coal gasification fluorine-containing wastewater in the step a is 30-60 mg/L.
4. The advanced treatment method of the high-concentration coal gasification fluorine-containing wastewater according to claim 1, characterized in that: the adding amount of the lime in the step a is 1120-1350 g/m 3 Waste water, the adding amount of the magnetic powder is 23-28 g/m 3 The adding amount of the polyacrylamide PAM is 1.5 to 2.0g/m 3 And (4) waste water.
5. The advanced treatment method of the high-concentration coal gasification fluorine-containing wastewater according to claim 4, characterized in that: preparing lime milk with the concentration of 10wt% before adding the lime in the step a; preparing a solution with the concentration of 1wt permillage before adding the polyacrylamide PAM; and the pH value in the primary reaction tank is controlled to be 12.
6. The method of claim 1The advanced treatment method of the medium-high concentration coal gasification fluorine-containing wastewater is characterized by comprising the following steps: the addition amount of the defluorination agent solution in the step c is 2080 to 2500g/m 3 The addition amount of the magnetic powder is 45-56 g/m 3 The addition amount of the polyacrylamide PAM is 3-4 g/m 3 Waste water; the concentration of the defluorination agent solution is 20-30 wt%.
7. The advanced treatment method of the medium-high concentration coal gasification wastewater containing fluorine according to claim 6, characterized in that: preparing a solution with the concentration of 1 wt% before adding the polyacrylamide PAM; and the pH value in the secondary reaction tank is controlled to be 6-7.
8. The advanced treatment method of the high-concentration coal gasification fluorine-containing wastewater according to claim 1, characterized in that: the fluorine removal agent in the step c is provided by Guanying New Material science and technology Limited, shandong.
9. The advanced treatment method of the high-concentration coal gasification wastewater containing fluorine according to claim 1, characterized in that: the molecular weight of the polyacrylamide PAM is 800-1000 ten thousand.
10. The advanced treatment method of the high-concentration coal gasification fluorine-containing wastewater according to claim 1, characterized in that: and e, the fluoride ions in the supernatant discharged in the step e are less than or equal to 1mg/L, the pH value is 6-7, and the turbidity is less than 10NTU.
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| JP2000015269A (en) * | 1998-04-27 | 2000-01-18 | Fujitsu Ltd | Treating method for fluorine-containing water |
| CN207227197U (en) * | 2017-04-11 | 2018-04-13 | 天津特立环保科技有限公司 | A kind of fluorine-containing waste water processing apparatus |
| CN110304754A (en) * | 2019-03-19 | 2019-10-08 | 中国电子系统工程第二建设有限公司 | A kind of high-concentration fluorine-containing waste water deep treatment method |
| CN210796127U (en) * | 2019-09-29 | 2020-06-19 | 浙江省环境工程有限公司 | Coking wastewater defluorination decoloration advanced treatment system |
| CN113548774A (en) * | 2021-08-31 | 2021-10-26 | 东方日升（常州）新能源有限公司 | Fluorine removal method for fluorine-containing wastewater |
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| JP2000015269A (en) * | 1998-04-27 | 2000-01-18 | Fujitsu Ltd | Treating method for fluorine-containing water |
| CN207227197U (en) * | 2017-04-11 | 2018-04-13 | 天津特立环保科技有限公司 | A kind of fluorine-containing waste water processing apparatus |
| CN110304754A (en) * | 2019-03-19 | 2019-10-08 | 中国电子系统工程第二建设有限公司 | A kind of high-concentration fluorine-containing waste water deep treatment method |
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