CN111499103B - Alcohol wastewater recycling system based on membrane technology - Google Patents
Alcohol wastewater recycling system based on membrane technology Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
- C02F2103/325—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters from processes relating to the production of wine products
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- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
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- Y02A20/131—Reverse-osmosis
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Abstract
The invention relates to an alcohol wastewater recycling system based on a membrane technology, which comprises a high-density sedimentation tank, an ultrafiltration system and a first reverse osmosis system which are sequentially connected; a concentrated water outlet of the first reverse osmosis system is connected with a water inlet of a first water tank, and a water outlet of the first water tank is sequentially connected with an ozone catalytic device and a biological filter; the water outlet of the first reverse osmosis system is connected with the water inlet of the second water tank, the water outlet of the second water tank is connected with the continuous electric desalting device, and the water outlet of the continuous electric desalting device is connected with the water storage tank. The invention can carry out ozone catalysis and degradation treatment of the biological filter on the concentrated water of the system, meets the discharge requirements of the emission standard of pollutants for fermented alcohol and white spirit industrial water, and the stable quality of the produced water of the treatment system can be directly reused as the make-up water of a high-pressure boiler for production, thus practically meeting the actual production requirements.
Description
Technical Field
The invention relates to the technical field of alcohol wastewater treatment, in particular to an alcohol wastewater recycling system based on a membrane technology.
Background
In the existing industry for processing and producing alcohol by using corn as raw material, DDGS (Distillers Dried Grains with Solubles) feed is generally recovered by adopting an evaporation concentration process, and the production process does not generate high-concentration alcohol waste liquid. The production wastewater in the alcohol industry is mainly alcohol clear liquid mainly comprising still distillation water, vinasse separation condensed water and workshop cleaning water, the part of alcohol wastewater is treated by the existing IC (internal circulation anaerobic bioreactor) and aeration processes in a factory area, the effluent reaches the discharge standard of fermentation alcohol and white spirit industrial water pollutants (GB 27631 one-pass 2011) and is directly discharged, the treatment process refers to a figure 1, and after the system is adopted for treatment, the concentrated water quantity of the system is more than 30% of the water inflow.
At present, most domestic alcohol enterprises adopt the method of directly discharging the alcohol wastewater after biochemical treatment, which increases the environmental burden and is also the waste of resources. Therefore, in order to improve the utilization rate of water resources, save water resources and realize the aspects of economic benefits, social benefits and environmental benefits, the part of discharged water needs to be recycled.
The alcohol wastewater treated by the IC (internal circulation anaerobic bioreactor) and aeration process has high turbidity, suspended matter SS, COD and total dissolved solid TDS content, and brings great burden to the recycling treatment process.
In the text of the experimental research on the advanced treatment of alcohol wastewater by a coagulation filtration-ultrafiltration-membrane system, Tangmin et al propose that alcohol wastewater is deeply treated by the coagulation filtration-ultrafiltration-membrane system, the process is adopted to recycle the biochemical wastewater in the alcohol industry, and the effluent can be used as make-up water of a high-pressure boiler only after being treated by mixed bed desalting equipment and pH ammoniation adjusting equipment. However, the processing process route still has unsolved problems:
1) concentrated water is generated inevitably through membrane system treatment, the inlet water is concentrated in times through the membrane system to generate concentrated water, the concentration of pollutants in the concentrated water is higher and cannot be discharged, and a corresponding treatment method is not provided in the process;
2) the use of the rear-end mixed bed desalting equipment brings the burden of treatment of the regenerated wastewater.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an alcohol wastewater recycling system based on a membrane technology, so as to treat wastewater generated by advanced treatment of a membrane system and enable the wastewater to reach the discharge standard.
In order to solve the technical problems, the invention provides an alcohol wastewater recycling system based on a membrane technology, which comprises a high-density sedimentation tank, an ultrafiltration system and a first reverse osmosis system which are sequentially connected; the concentrated water outlet of the first reverse osmosis system is connected with the water inlet of a first water tank, and the water outlet of the first water tank is sequentially connected with an ozone catalytic device and a biological filter; the water outlet of the first reverse osmosis system is connected with the water inlet of the second water tank, the water outlet of the second water tank is connected with the continuous electric desalting device, and the water outlet of the continuous electric desalting device is connected with the water storage tank.
The membrane technology-based alcohol wastewater recycling system can replace the existing treatment process to treat and recycle the alcohol industry wastewater. After biochemical treatment by the existing IC + aeration process, the alcohol wastewater enters the high-density sedimentation tank to realize the removal of hardness, COD, BOD, SS and turbidity; the effluent of the high-density sedimentation tank automatically flows into an immersed ultrafiltration system, the ultrafiltration system can further intercept and remove macromolecular COD, turbidity, suspended matters, fine particles and the like in the water, and then the wastewater enters a first reverse osmosis system to realize further concentration and separation of the wastewater; and the concentrated water of the first reverse osmosis system is collected in a first water tank, COD in the water is degraded and broken through an ozone catalytic device, the concentrated water is treated by the ozone catalytic device, the effluent flows to a biological filter, the biological filter combines microorganisms and fillers, and the COD, ammonia nitrogen and total nitrogen in the influent water are further treated, so that the effluent meets the sewage discharge standard. And the produced water of the first reverse osmosis system is collected in the second water tank and then flows into the continuous electric desalting device, the continuous electric desalting device can carry out advanced treatment on the incoming water, and the produced water of the continuous electric desalting device is collected into the terminal water storage tank and can be reused as the make-up water of the high-pressure boiler. Therefore, the invention can carry out ozone catalysis and degradation treatment of the biological filter on the concentrated water of the system, meets the discharge requirement of the pollutant discharge standard of fermented alcohol and white spirit industrial water, and the stable quality of the produced water of the treatment system can be directly reused as the supplementary water of the high-pressure boiler for production, thereby practically meeting the actual production requirement.
Preferably, a third water tank is arranged between the ultrafiltration system and the first reverse osmosis system, a water inlet of the third water tank is connected with the ultrafiltration system, and a water outlet of the third water tank is connected with the first reverse osmosis system; and a water pump is arranged on a connecting pipeline between the ultrafiltration system and the third water tank.
Preferably, a second reverse osmosis system is arranged between the second water tank and the continuous electric desalting device, a water inlet of the second reverse osmosis system is connected with a water outlet of the second water tank, a concentrated water outlet of the second reverse osmosis system is connected with a water inlet of the third water tank, a water producing outlet of the second reverse osmosis system is connected with a water inlet of a fourth water tank, and a water outlet of the fourth water tank is connected with the continuous electric desalting device. A second reverse osmosis system is arranged, further desalination treatment can be carried out on the incoming water, and the produced water of the second reverse osmosis system is collected in a fourth water tank to prepare for subsequent treatment; the concentrated water of the second reverse osmosis system can flow back to the third water tank according to the water quality characteristics of the concentrated water, and the main component of the concentrated water is salt, so that the concentrated water can be conveniently reprocessed by the first reverse osmosis system, and the waste of water resources is reduced.
Preferably, the concentrated water outlet of the continuous electric desalting device is connected with the water inlet of the second water tank, and the concentrated water of the continuous electric desalting device can flow back to the second water tank according to the water quality characteristics, wherein the main component of the concentrated water is salt, and the salt content of the concentrated water is not high, so that the second reverse osmosis system can treat the waste water generated by the system, and the waste of water resources is reduced.
Preferably, a third reverse osmosis system is arranged between the first water tank and the ozone catalytic device, a water inlet of the third reverse osmosis system is connected with a water outlet of the first water tank, a concentrated water outlet of the third reverse osmosis system is connected with a water inlet of a fifth water tank, a water outlet of the fifth water tank is connected with the ozone catalytic device, and a water production outlet of the third reverse osmosis system is connected with a water inlet of the second water tank. The third reverse osmosis system is used for retreating the concentrated water of the first reverse osmosis system and recycling the produced water of the third reverse osmosis system into the second water tank, so that the second reverse osmosis system can retreat the produced water conveniently, and the concentrated water of the third reverse osmosis system is discharged after being treated by the subsequent ozone catalytic device and the biological filter.
Preferably, a first safety filter is arranged between the water outlet of the third water tank and the water inlet of the first reverse osmosis system, between the water outlet of the second water tank and the water inlet of the second reverse osmosis system, and between the water outlet of the first water tank and the water inlet of the third reverse osmosis system. The first safety filter can perform basic filtration on the incoming water so as to protect the first reverse osmosis system, the second reverse osmosis system and the third reverse osmosis system.
Preferably, a second safety filter is arranged between the water outlet of the fourth water tank and the continuous electric desalting device so as to protect the continuous electric desalting device.
Preferably, a dosing device is arranged at the water inlet of the first safety filter, so that a medicament for preventing scaling and oxidation is added into water through the dosing device to protect a subsequent system.
Preferably, the water outlets of the first water tank, the second water tank, the third water tank, the fourth water tank and the fifth water tank are all provided with a booster pump, and the water inlets of the first reverse osmosis system, the second reverse osmosis system and the third reverse osmosis system are all provided with a high-pressure pump.
Preferably, the reverse osmosis membrane elements of the first reverse osmosis system, the second reverse osmosis system and the third reverse osmosis system respectively adopt an anti-pollution membrane element, a high-pressure membrane element and a high-salt rejection membrane element.
Preferably, a dosing device is arranged on the high-density sedimentation tank to add PAM, FeCl3 and CaO into the sedimentation tank, so that the inlet water is mixed, reacted and separated with the medicament in the high-density sedimentation tank.
Preferably, an aeration fan is arranged in the ultrafiltration system to aerate the submerged ultrafiltration system, so that the treatment effect of the submerged ultrafiltration system is enhanced.
The alcohol wastewater recycling system based on the membrane technology has the following beneficial effects:
(1) the system of the invention has stable water quality of produced water, can be directly reused as the supplementary water of the high-pressure boiler for production, and practically meets the actual production requirement;
(2) the water quantity reflux circulation designed by the invention improves the overall recovery rate of the system, increases the recyclable water quantity and reduces the discharged water quantity;
(3) according to the multi-stage reverse osmosis system designed by the invention, membrane elements with different functions are selected according to the requirements of each section and the characteristics of water quality, so that the stable operation of the system is ensured on the basis of realizing the functions of the system;
(4) the invention adopts the third reverse osmosis system to reduce the concentrated water of the system, adopts the ozone catalysis and the biological filter tank to carry out degradation treatment, has less discharged water amount and meets the discharge requirements of the discharge standard of pollutants for fermented alcohol and white spirit industrial water.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a flow chart of the conventional alcohol wastewater recycling process;
FIG. 2 is a flow chart of the alcohol wastewater recycling system for treating alcohol wastewater based on membrane technology according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an alcohol wastewater recycling system based on membrane technology according to an embodiment of the present invention.
Description of the drawings:
1-high density sedimentation tank; 2-an immersion ultrafiltration system; 3-an aeration fan; 4-a water pump; 5-a third water tank; 6-a first reverse osmosis system; 7-a second water tank; 8-a first water tank; 9-a second reverse osmosis system; 10-a fourth water tank; 11-a second cartridge filter; 12-a continuous electrodeionization device; 13-a water storage tank; 14-a third reverse osmosis system; 15-a fifth water tank; 16-an ozone catalytic unit; 17-a biological filter; 18-a first safety filter; 19-a dosing device; 20-a booster pump; 21-high pressure pump.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 2 and fig. 3, the embodiment discloses an alcohol wastewater recycling system based on membrane technology, which includes a high-density sedimentation tank 1, wherein alcohol wastewater after biochemical treatment by existing IC + aeration process enters the high-density sedimentation tank 1, and a drug administration device is arranged on the high-density sedimentation tank 1, so as to add PAM, FeCl3 and CaO into the sedimentation tank through the drug administration device, so that the inlet water is mixed, reacted and separated with a medicament in the high-density sedimentation tank 1, and the removal of hardness, COD, BOD, SS and turbidity is realized.
High density sedimentation tank 1 passes through the pipeline and is connected with submergence formula ultrafiltration system 2, and the play water of high density sedimentation tank 1 flows to submergence formula ultrafiltration system 2 by oneself, and submergence formula ultrafiltration system 2 further intercepts macromolecule COD, turbidity, suspended solid and the fine particle etc. of aquatic and gets rid of, for reinforcing submergence formula ultrafiltration system 2's treatment effect, has set up aeration fan 3, carries out the aeration to submergence formula ultrafiltration system 2.
The water produced by the submerged ultrafiltration system 2 is delivered to a third water tank 5 by a water pump 4 for water quantity regulation and collection. The effluent of the third water tank 5 is conveyed to a first reverse osmosis system 6, the first reverse osmosis system 6 adopts an anti-pollution and wide-flow-channel membrane element, the arrangement ratio is carried out according to a first stage and a second stage, the recovery rate of the system can be adjusted to 75 percent, the concentration and separation of the incoming water are realized, the produced water treated by the first reverse osmosis system 6 is collected into a second water tank 7, and the concentrated water of the first reverse osmosis system 6 is collected into a first water tank 8.
After the second water tank 7 collects and adjusts the water quantity, the water is conveyed to a second reverse osmosis system 9, the second reverse osmosis system 9 selects membrane elements with high desalination rate, the discharge ratio is carried out according to a first stage and a second stage, the recovery rate of the system can reach 85%, and the further desalination of the incoming water is realized. The concentrated water of the second reverse osmosis system 9 can flow back to the third water tank 5 according to the water quality characteristics of the concentrated water and the main component of the concentrated water is salt so as to be reprocessed by the first reverse osmosis system 6; the produced water from the second reverse osmosis system 9 is collected in a fourth water tank 10 in preparation for subsequent treatment.
The effluent of the fourth water tank 10 is conveyed to a second security filter 11, the second security filter 11 selects a filter material with the filtering precision of 0.45 μ M, the effluent of the second security filter 11 enters a continuous electric desalting device 12, the continuous electric desalting device 12 is a novel membrane separation technology combining electrodialysis and ion exchange, the incoming water can be deeply treated, the water production resistivity can reach 15 MOmega cm, the system recovery rate can reach 95%, the water produced by the continuous electric desalting device 12 is collected into a water storage tank 13 and can be recycled as the make-up water of a high-pressure boiler; the concentrated water of the continuous electric demineralizer 12 can flow back to the second water tank 7 according to the water quality characteristics thereof to be reprocessed by the second reverse osmosis system 9.
The concentrated water of the first reverse osmosis system 6 is collected by the first water tank 8 and then is conveyed to the third reverse osmosis system 14, the third reverse osmosis system 14 selects high-pressure-resistant membrane elements, the discharge ratio is carried out according to a first stage and a second stage, the intersegmental circulation can be set according to the water inlet condition, the recovery rate of the system reaches 50%, and the advanced desalination treatment of the incoming water is realized. The produced water of the third reverse osmosis system 14 can be collected into the second water tank 7 so as to improve the recovery rate of the whole system and save water resources; the concentrated water of the third reverse osmosis system 14 is collected in a fifth water tank 15 for water quantity collection and regulation, and then is conveyed to an ozone catalytic device 16, wherein the ozone catalytic device 16 utilizes the catalytic oxidation principle of ozone to degrade and chain break COD in the water; after being treated by the ozone catalytic unit 16, the effluent flows to the biological filter 17. The biological filter 17 combines microorganisms and fillers to further treat COD, ammonia nitrogen and total nitrogen in the inlet water, and the outlet water meets the sewage discharge standard.
In this embodiment, a first safety filter 18 is disposed between the water outlet of the third water tank 5 and the water inlet of the first reverse osmosis system 6, between the water outlet of the second water tank 7 and the water inlet of the second reverse osmosis system 9, and between the water outlet of the first water tank 8 and the water inlet of the third reverse osmosis system 14, and the first safety filter 18 can perform basic filtration on the incoming water to protect the first reverse osmosis system 6, the second reverse osmosis system 9, and the third reverse osmosis system 14; and a dosing device 19 is arranged at the water inlet of each first safety filter 18, so that medicaments for preventing scaling and oxidation are added into water through the dosing devices 19, and a subsequent system is protected.
Specifically, each first security filter 18 is a filter material having a filtering precision of 5 μm.
Furthermore, a booster pump 20 is disposed at the water outlets of the first water tank 8, the second water tank 7, the third water tank 5, the fourth water tank 10 and the fifth water tank 15, and a high-pressure pump 21 is disposed at the water inlets of the first reverse osmosis system 6, the second reverse osmosis system 9 and the third reverse osmosis system 14.
The alcohol wastewater recycling system based on the membrane technology improves the quality of recycled water, can be used as boiler make-up water to be directly recycled to a high-pressure steam boiler, and solves the problem that concentrated water cannot be discharged in the traditional process; in addition, compared with the conventional process shown in fig. 1, the produced water in the water storage tank 13 of the present embodiment can be directly reused as boiler make-up water, the water discharged through the biological filter 17 meets the sewage discharge standard, and the discharged water amount is only 12% of the system water inflow, thereby greatly saving water resources.
It should be noted that the high-density sedimentation tank 1, the submerged ultrafiltration system 2, the continuous electric desalination device 12, the ozone catalytic device 16 and the biological filter 17 in this embodiment are all prior art in the field of wastewater treatment, and specific reference may be made to the relevant contents described in chinese patent documents or patent application documents with application numbers 201820808973.1, 201520939267.7, 201510822328.6 and 201420097869.8.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (6)
1. The utility model provides an alcohol waste water recycling system based on membrane technique which characterized in that includes:
the high-density sedimentation tank, the ultrafiltration system and the first reverse osmosis system are connected in sequence; a dosing device is arranged on the high-density sedimentation tank to dose PAM, FeCl3 and CaO into the high-density sedimentation tank;
the concentrated water outlet of the first reverse osmosis system is connected with the water inlet of a first water tank, and the water outlet of the first water tank is sequentially connected with an ozone catalytic device and a biological filter;
the water outlet of the first reverse osmosis system is connected with the water inlet of a second water tank, the water outlet of the second water tank is connected with a continuous electric desalting device, and the water outlet of the continuous electric desalting device is connected with a water storage tank;
a third water tank is arranged between the ultrafiltration system and the first reverse osmosis system, a water inlet of the third water tank is connected with the ultrafiltration system, and a water outlet of the third water tank is connected with the first reverse osmosis system; a water pump is arranged on a connecting pipeline between the ultrafiltration system and the third water tank;
a second reverse osmosis system is arranged between the second water tank and the continuous electric desalting device, a water inlet of the second reverse osmosis system is connected with a water outlet of the second water tank, a concentrated water outlet of the second reverse osmosis system is connected with a water inlet of the third water tank, a produced water outlet of the second reverse osmosis system is connected with a water inlet of a fourth water tank, and a water outlet of the fourth water tank is connected with the continuous electric desalting device; a concentrated water outlet of the continuous electric desalting device is connected with a water inlet of the second water tank;
a third reverse osmosis system is arranged between the first water tank and the ozone catalytic device, a water inlet of the third reverse osmosis system is connected with a water outlet of the first water tank, a concentrated water outlet of the third reverse osmosis system is connected with a water inlet of a fifth water tank, a water outlet of the fifth water tank is connected with the ozone catalytic device, and a water producing outlet of the third reverse osmosis system is connected with a water inlet of the second water tank.
2. The system for recycling alcohol wastewater based on membrane technology as claimed in claim 1, wherein:
and a first safety filter is arranged between the water outlet of the third water tank and the water inlet of the first reverse osmosis system, between the water outlet of the second water tank and the water inlet of the second reverse osmosis system, and between the water outlet of the first water tank and the water inlet of the third reverse osmosis system.
3. The system for recycling alcohol wastewater based on membrane technology as claimed in claim 2, wherein:
and a second safety filter is arranged between the water outlet of the fourth water tank and the continuous electric desalting device.
4. The system for recycling alcohol wastewater based on membrane technology as claimed in claim 2, wherein:
and a dosing device is arranged at the water inlet of the first safety filter.
5. The system for recycling alcohol wastewater based on membrane technology as claimed in claim 3, wherein:
the water outlets of the first water tank, the second water tank, the third water tank, the fourth water tank and the fifth water tank are provided with booster pumps, and the water inlets of the first reverse osmosis system, the second reverse osmosis system and the third reverse osmosis system are provided with high-pressure pumps.
6. The system for recycling alcohol wastewater based on membrane technology as claimed in claim 1, wherein:
and reverse osmosis membrane elements of the first reverse osmosis system, the second reverse osmosis system and the third reverse osmosis system respectively adopt an anti-pollution membrane element, a high-pressure membrane element and a high-desalination-rate membrane element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010345113.0A CN111499103B (en) | 2020-04-27 | 2020-04-27 | Alcohol wastewater recycling system based on membrane technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010345113.0A CN111499103B (en) | 2020-04-27 | 2020-04-27 | Alcohol wastewater recycling system based on membrane technology |
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| Publication Number | Publication Date |
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| CN111499103A CN111499103A (en) | 2020-08-07 |
| CN111499103B true CN111499103B (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010345113.0A Active CN111499103B (en) | 2020-04-27 | 2020-04-27 | Alcohol wastewater recycling system based on membrane technology |
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| CN202766386U (en) * | 2012-09-18 | 2013-03-06 | 浩蓝环保股份有限公司 | Treatment system for waste water generated in production of fuel ethanol by cassava |
| CN102942265A (en) * | 2012-11-16 | 2013-02-27 | 南京中电环保工程有限公司 | Whole-membrane-process water treatment integration device |
| CN205188051U (en) * | 2015-11-17 | 2016-04-27 | 南京麦得文环保科技有限公司 | LED trade chip waste water retrieval and utilization device |
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