CN111807620A - Emulsion wastewater treatment system based on comprehensive membrane method - Google Patents
Emulsion wastewater treatment system based on comprehensive membrane method Download PDFInfo
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- CN111807620A CN111807620A CN202010664559.XA CN202010664559A CN111807620A CN 111807620 A CN111807620 A CN 111807620A CN 202010664559 A CN202010664559 A CN 202010664559A CN 111807620 A CN111807620 A CN 111807620A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/44—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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a system for treating emulsion wastewater based on a comprehensive membrane method, which comprises a filter, an oil separation regulating reservoir, a biochemical reactor and tubular ultrafiltration membrane filtering equipment, wherein the oil separation regulating reservoir is arranged in the filter; the device comprises MBR membrane filtration equipment and disc-tube reverse osmosis membrane equipment, wherein emulsion wastewater is filtered and enters an oil removal regulating reservoir for oil removal treatment, and the wastewater after oil removal is filtered by a tube-type ultrafiltration membrane so as to further realize oil-water separation; biochemical property of permeate of the tubular ultrafiltration membrane is improved, the permeate enters a biochemical reactor for biochemical treatment, clear liquid filtered by an MBR membrane is stored in an intermediate water tank, and then the clear liquid is sent into a disc tubular reverse osmosis membrane device by a booster pump and a high-pressure pump, and the produced clear water is recycled; the system of the invention realizes compact arrangement of equipment and small occupied area; the membrane has long service life, high treatment efficiency in the process, simple operation, convenient operation and maintenance, can reduce the addition of water treatment agents, can realize automatic operation, and can ensure that the reuse water amount of the emulsion wastewater after treatment can reach more than 85 percent.
Description
Technical Field
The invention belongs to the field of wastewater treatment, relates to a wastewater treatment system, and particularly relates to a system for treating emulsion wastewater based on a comprehensive membrane method.
Background
The emulsion wastewater mainly comes from the industries of mechanical processing, metal material processing and the like, mainly comprises mineral oil, a surfactant, soluble organic matters, solid suspended matters and the like, and is organic wastewater with high oil content, high COD (chemical oxygen demand) and difficult degradation. Soil pollution, water body pollution, volatilization of a part of components and decomposition products in the emulsion and pollution of the atmosphere can be caused due to improper storage and disposal of the emulsion wastewater, and the pollution finally harms the self health of human beings and the surrounding environment through a food chain and a biosphere. The emulsion wastewater is already classified as dangerous waste, and the emulsion wastewater needs to be treated to reach the standard and then is discharged.
At present, the treatment process of emulsion wastewater mainly comprises a physical method (distillation, filtration and the like), a chemical method (coagulation, acid and alkali demulsification, advanced oxidation and the like) and a microbiological method. Due to the complexity of the components of the emulsion wastewater, the treatment effect of a single treatment method is not ideal, and the requirement of up-to-standard discharge cannot be met. Therefore, at present, various emulsion wastewater combined treatment technologies are rapidly developed and applied, and combined research and application are mostly carried out by technologies such as demulsification, air flotation, coagulating sedimentation, hydrolytic acidification, advanced oxidation, biochemistry and filtration. The combined treatment technology has the disadvantages of long flow, complex procedures in part of treatment links, addition of acid and alkali or different water treatment agents and even generation of secondary pollutants.
Along with the improvement and progress of membrane technology in recent years, the membrane method for treating emulsion wastewater gradually draws attention, researches and applications prove that the membrane technology can effectively realize oil-water separation, chemical agents do not need to be added in the treatment process, the treatment effect is good, the separation efficiency is high, and membrane treatment equipment is simple and compact, small in occupied area, simple to operate and high in automation degree. Therefore, it is necessary to develop a combined treatment technology based on a membrane method, which can improve the treatment level and efficiency of the emulsion wastewater.
Disclosure of Invention
The invention provides a system for treating emulsion wastewater based on a comprehensive membrane method.
The technical scheme of the invention is summarized as follows:
a system for treating emulsion wastewater based on a comprehensive membrane method comprises a filter 1, an oil separation regulating reservoir 2 and a biochemical reactor 5; the oil separation adjusting tank 2 comprises an oil removal tank 201 and a water collection tank 202, wherein the oil removal tank 201 is provided with an oil removal device 15, a floating oil collection pipe 16 and an overflow water tank 203, and wastewater in the oil removal tank enters the water collection tank through the overflow water tank; the biochemical reactor 5 comprises an anaerobic treatment tank 501, an aerobic contact oxidation treatment tank 502 and an MBR treatment tank 503; a first aerator 17 is arranged at the bottom in the aerobic contact oxidation treatment tank 502, a second aerator 18 is arranged at the bottom in the MBR treatment tank 503, and an MBR membrane filtering device 19 is arranged in the middle of the MBR treatment tank 503; the emulsion wastewater inlet pipeline is connected with the filter 1, and the filter 1 is connected with the oil removal tank 201 of the oil separation regulating tank 2 through a pipeline; the water collecting tank 202 is sequentially connected with the circulating pump 3 and the tubular ultrafiltration membrane filtering equipment 4 through pipelines, and the concentrated water outlet of the tubular ultrafiltration membrane filtering equipment 4 is connected with the oil removing tank 201; a water production outlet of the tubular ultrafiltration membrane filtering device 4 is connected with an anaerobic treatment tank 501 of the biochemical reactor 5 through a pipeline, a fan 6 is respectively connected with a first aerator 17 and a second aerator 18 through pipelines, and the MBR membrane filtering device 19 is sequentially connected with a self-priming pump 7, an intermediate water tank 8, a booster pump 9 and a high-pressure pump 10 through pipelines and then connected with an inlet of a disc tubular reverse osmosis membrane device 11; a clear water outlet of the disc tube type reverse osmosis membrane equipment 11 is connected with a produced water recycling pipe; the concentrated water outlet of the disc tube type reverse osmosis membrane equipment is connected with an anaerobic treatment tank 501 of the biochemical reactor through a pipeline; the bottom of the anaerobic treatment tank 501, the bottom of the aerobic contact oxidation treatment tank 502, the bottom of the MBR treatment tank 503 and the bottom of the oil removal tank 201 are respectively connected with a sludge concentration tank (13) through pipelines; a sludge lifting pump 20 is arranged at the bottom of the sludge concentration tank (13), and the sludge lifting pump 20 is respectively connected with the dosing device 14 and the sludge dewatering machine 12 through pipelines; the water outlet of the sludge dewatering machine is connected with the oil removing pool 201 through a pipeline; the sludge outlet of the sludge dewatering machine is connected with a sludge outward conveying pipe.
The filter 1 is preferably a basket filter.
The invention has the advantages that:
the emulsion wastewater treatment system based on the comprehensive membrane method effectively solves the problems of long traditional emulsion wastewater treatment process, complex operation, large-amount use of medicaments and unstable treatment effect; the system provided by the invention mainly comprises membrane equipment, and is combined with biochemical treatment, the emulsion wastewater is subjected to oil-water separation through tubular ultrafiltration membrane filtering equipment, the oil-water separation effect of the emulsion wastewater is enhanced, the biodegradability of filtered produced water is improved, and the treatment efficiency of the system is further improved through MBR membrane filtering equipment and disc tubular reverse osmosis membrane equipment; the process system has compact flow, can realize compact arrangement of equipment and occupies small area; the membrane has long service life, high treatment efficiency in the process, reduced addition of water treatment agents, automatic operation, simple operation, convenient operation and maintenance, and larger social and economic benefits, and the reuse water amount of the emulsion wastewater after treatment can reach more than 85%.
Drawings
FIG. 1 is a schematic diagram of a system for treating emulsion wastewater based on an integrated membrane method.
FIG. 2 is a schematic diagram of the system membrane cleaning piping connection of the present invention.
Detailed Description
MBRs are also known as membrane bioreactors.
The components in fig. 1 and 2:
1. a filter; 2. an oil removal regulating reservoir; 201. an oil removal tank; 202. a water collecting tank; 203. an overflow trough; 3. a circulation pump; 4. tubular ultrafiltration membrane filtration equipment; 5. a biochemical reactor; 501. an anaerobic treatment tank; 502. an aerobic contact oxidation treatment tank; 503. an MBR treatment tank; 6. a fan; 7. a self-priming pump; 8. an intermediate water tank; 9. a booster pump; 10. a high pressure pump; 11. a disc-and-tube reverse osmosis membrane (DTRO) unit; 12. a sludge dewatering machine; 13. a sludge concentration tank; 14. a dosing device; 15. an oil removal device; 16. a floating oil collecting pipe; 17. a first aerator; 18. a second aerator; 19. MBR membrane filtration equipment; 20. a sludge lift pump; 21. a cleaning room; 22. a second conduit; 23. a third pipeline; 24. a fourth conduit; 25. a fifth pipeline; 26 sixth conduit.
The invention is further illustrated by the following figures.
A system for treating emulsion wastewater (see figure 1) based on a comprehensive membrane method comprises a filter 1, an oil separation regulating reservoir 2 and a biochemical reactor 5; the oil separation adjusting tank 2 comprises an oil removal tank 201 and a water collection tank 202, wherein the oil removal tank 201 is provided with an oil removal device 15, a floating oil collection pipe 16 and an overflow water tank 203, and wastewater in the oil removal tank enters the water collection tank through the overflow water tank; the biochemical reactor 5 comprises an anaerobic treatment tank 501, an aerobic contact oxidation treatment tank 502 and an MBR treatment tank 503; a first aerator 17 is arranged at the bottom in the aerobic contact oxidation treatment tank 502, a second aerator 18 is arranged at the bottom in the MBR treatment tank 503, and an MBR membrane filtering device 19 is arranged in the middle of the MBR treatment tank 503; the emulsion wastewater inlet pipeline is connected with the filter 1, and the filter 1 is connected with the oil removal tank 201 of the oil separation regulating tank 2 through a pipeline; the water collecting tank 202 is sequentially connected with the circulating pump 3 and the tubular ultrafiltration membrane filtering equipment 4 through pipelines, and the concentrated water outlet of the tubular ultrafiltration membrane filtering equipment 4 is connected with the oil removing tank 201; a water production outlet of the tubular ultrafiltration membrane filtering device 4 is connected with an anaerobic treatment tank 501 of the biochemical reactor 5 through a pipeline, a fan 6 is respectively connected with a first aerator 17 and a second aerator 18 through pipelines, and the MBR membrane filtering device 19 is sequentially connected with a self-priming pump 7, an intermediate water tank 8, a booster pump 9 and a high-pressure pump 10 through pipelines and then connected with an inlet of a disc tubular reverse osmosis membrane device 11; a clear water outlet of the disc tube type reverse osmosis membrane equipment 11 is connected with a produced water recycling pipe; the concentrated water outlet of the disc tube type reverse osmosis membrane equipment is connected with an anaerobic treatment tank 501 of the biochemical reactor through a pipeline; the bottom of the anaerobic treatment tank 501, the bottom of the aerobic contact oxidation treatment tank 502, the bottom of the MBR treatment tank 503 and the bottom of the oil removal tank 201 are respectively connected with the sludge concentration tank 13 through pipelines; the bottom of the sludge concentration tank 13 is provided with a sludge lifting pump 20, and the sludge lifting pump 20 is respectively connected with the dosing device 14 and the sludge dewatering machine 12 through pipelines; the water outlet of the sludge dewatering machine is connected with the oil removing pool 201 through a pipeline; the sludge outlet of the sludge dewatering machine is connected with a sludge outward conveying pipe.
The filter 1 is preferably a basket filter.
The operation of the emulsion wastewater treatment system based on the comprehensive membrane method comprises the following steps:
(1) oil removal and ultrafiltration membrane oil-water separation treatment:
filtering the emulsion wastewater by a filter 1, filtering and intercepting particles and other impurities in the emulsion wastewater so as to prevent the particles and other impurities from entering a tubular ultrafiltration membrane filtering device 4 to scratch a membrane, wherein the filtering aperture of the filter is 5-50 mu m, the filtered emulsion wastewater enters an oil removal tank 201 of an oil separation regulating tank 2, an oil removal device 15 arranged at the upper part of the oil removal tank sends floating oil on the water surface into a floating oil collecting pipe 16 (the oil removal device 15 is a travelling oil scraper, the floating oil collecting pipe is a pipeline with an opening at the upper part, the travelling oil scraper collects the floating oil at the upper part of the oil removal tank and sends the floating oil into the floating oil collecting pipe, the floating oil in the floating oil collecting pipe is discharged into a collecting place), the deoiled emulsion wastewater enters a water collecting tank 202 through an overflow water tank 203, the emulsion wastewater in the water collecting tank is sent into the tubular ultrafiltration membrane filtering device 4 through a circulating pump 3 (the number of membrane filtering device can, oil-water separation is realized in a cross-flow filtration mode under the driving of pressure, and the pressure is 0.1-0.6 MPa. ) The emulsion wastewater is driven by pressure to realize oil-water separation, the oil content and COD of the penetrating fluid of the tubular ultrafiltration membrane filtering equipment are reduced, the penetrating fluid of the tubular ultrafiltration membrane filtering equipment enters an anaerobic treatment tank 501 of the biochemical reactor 5, and the retained concentrated water returns to an oil removal tank of the oil separation regulating tank for circular oil removal;
(2) biochemical reaction and MBR membrane filtration treatment:
the penetrating fluid (hereinafter referred to as penetrating fluid) of the tubular ultrafiltration membrane filtering device of the anaerobic treatment tank 501 entering the biochemical reactor 5 is firstly treated by the anaerobic treatment tank 501 for anaerobic biological treatment to degrade high molecular substances, the hydraulic retention time of the anaerobic treatment is 48 hours, the penetrating fluid after the anaerobic treatment enters the aerobic contact oxidation treatment tank 502 for aeration aerobic biological treatment, organic matters are further degraded, the hydraulic retention time of the aerobic contact oxidation treatment is 72 hours, the penetrating fluid after the aerobic contact oxidation treatment enters the MBR treatment tank 503, the penetrating fluid stays in the MBR treatment tank for 24 hours, the intermittent aeration is realized by the intermittent operation of the fan 6, the aeration time of the intermittent aeration is 1.5 hours, the aeration interval is 1 hour, the liquid of the treated MBR treatment tank 503 is filtered by the MBR membrane filtering device 19 under the negative pressure of the self-sucking pump 7, the interception of sludge, microorganisms and the like is realized, and clear liquid generated by the MBR membrane filtering equipment enters the middle water tank 8.
(3) And (3) recycling and treating produced water of the disc-tube reverse osmosis membrane equipment:
the clear liquid that MBR membrane filtration equipment produced needs further to carry out membrane separation and handles, the clear liquid of middle water tank passes through after booster pump 9 (operating pressure is 0.3 ~ 0.6MPa) pressure boost, send into high-pressure pump 10 (high-pressure pump operating pressure is 4 ~ 7MPa) and step up, clear liquid after stepping up gets into dish tubular reverse osmosis membrane equipment 11, dish tubular reverse osmosis membrane equipment 11 intercepts organic matter and metal ion in the liquid in the concentrated water, the retrieval and utilization can be realized to the product water, the concentrated water after the dish tubular reverse osmosis membrane equipment is held back to biochemical reactor 5 and is further biochemically processed.
(4) The system desilting and each membrane equipment cleaning and washing:
sludge precipitated at the bottom of the anaerobic treatment tank 501, sludge precipitated at the bottom of the aerobic contact oxidation treatment tank 502, sludge precipitated at the bottom of the MBR treatment tank 503 and sludge precipitated at the bottom of the deoiling tank 201 are respectively discharged into the sludge concentration tank 13 through pipelines; the bottom sludge discharge port of each tank is higher than the top of the sludge concentration tank, and the sludge at the bottom of each tank enters the sludge concentration tank through a pipeline. A sludge lifting pump 20 is arranged at the bottom of the sludge concentration tank 13, and the sludge lifting pump 20 is respectively connected with a dosing device 14 (the medicament used by the dosing device is preferably cationic polyacrylamide) and the sludge dewatering machine 12 through pipelines; the water outlet of the sludge dewatering machine is connected with the oil removing pool 201 through a pipeline; the sludge outlet of the sludge dewatering machine is connected with a sludge outward conveying pipe.
Preferably, the system is further provided with a cleaning room 21, as shown in fig. 2, the cleaning room can clean the tubular ultrafiltration membrane filtering device 4, the MBR membrane filtering device 19 and the disc tubular reverse osmosis membrane device 11, and the cleaning room is connected with each membrane device through a pipeline. The inlet of the tubular ultrafiltration membrane filtering device is connected with the second pipeline 22 and then connected with a cleaning room, the concentrated water and produced water outlet of the tubular ultrafiltration membrane filtering device is connected with the third pipeline 23 and then connected with the cleaning room, the produced water outlet of the MBR membrane filtering device is connected with the fourth pipeline 24 and then connected with the cleaning room, the inlet of the disc tubular reverse osmosis membrane device is connected with the fifth pipeline 25 and then connected with the cleaning room, and the concentrated water and produced water outlet of the disc tubular reverse osmosis membrane device is connected with the sixth pipeline 26 and then connected with the cleaning room.
After the tubular ultrafiltration membrane, the MBR membrane and the disc tubular reverse osmosis membrane in the system are polluted and blocked or scaled, the cleaning of each membrane is completed through a cleaning and flushing device in a cleaning room and an external connecting pipeline, and the cleaning process and the steps of each membrane are familiar to those skilled in the art and are not different, so that the details are not repeated.
It will be understood by those skilled in the art that the above-described embodiments illustrate the principles and processes of the present invention, and are not intended to limit the invention, and that any simple modifications and equivalent changes made without departing from the spirit and principles of the present invention shall fall within the scope of the protection of the process solution of the present invention.
Claims (1)
1. A system for treating emulsion wastewater based on a comprehensive membrane method comprises a filter (1), an oil separation regulating tank (2) and a biochemical reactor (5); the oil separation adjusting tank (2) comprises an oil removal tank (201) and a water collection tank (202), wherein the oil removal tank (201) is provided with an oil removal device (15), a floating oil collection pipe (16) and an overflow water tank (203), and the oil separation adjusting tank is characterized in that the biochemical reactor (5) comprises an anaerobic treatment tank (501), an aerobic contact oxidation treatment tank (502) and an MBR treatment tank (503); a first aerator (17) is arranged at the bottom in the aerobic contact oxidation treatment tank (502), a second aerator (18) is arranged at the bottom in the MBR treatment tank (503), and MBR membrane filtering equipment (19) is arranged in the middle of the MBR treatment tank (503); the emulsion wastewater inlet pipeline is connected with the filter (1), and the filter (1) is connected with the oil removal tank (201) of the oil separation regulating tank (2) through a pipeline; the water collecting tank (202) is sequentially connected with the circulating pump (3) and the tubular ultrafiltration membrane filtering equipment (4) through pipelines, and the concentrated water outlet of the tubular ultrafiltration membrane filtering equipment is connected with the oil removing tank (201); a water production outlet of the tubular ultrafiltration membrane filtering device (4) is connected with an anaerobic treatment tank (501) of the biochemical reactor (5) through a pipeline, a fan (6) is respectively connected with a first aerator (17) and a second aerator (18) through pipelines, and an MBR membrane filtering device (19) is sequentially connected with a self-priming pump (7), an intermediate water tank (8), a booster pump (9) and a high-pressure pump (10) through pipelines and then is connected with an inlet of a disc tubular reverse osmosis membrane device (11); a clear water outlet of the disc tube type reverse osmosis membrane equipment (11) is connected with a produced water recycling pipe; the concentrated water outlet of the disc tube type reverse osmosis membrane equipment is connected with an anaerobic treatment pool (501) of the biochemical reactor through a pipeline; the bottom of the anaerobic treatment tank (501), the bottom of the aerobic contact oxidation treatment tank (502), the bottom of the MBR treatment tank (503) and the bottom of the oil removal tank (201) are respectively connected with a sludge concentration tank (13) through pipelines; a sludge lifting pump (20) is arranged at the bottom of the sludge concentration tank (13), and the sludge lifting pump (20) is respectively connected with the dosing device (14) and the sludge dewatering machine (12) through pipelines; the water outlet of the sludge dewatering machine is connected with the oil removing pool (201) through a pipeline; the sludge outlet of the sludge dewatering machine is connected with a sludge outward conveying pipe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114249444A (en) * | 2021-12-24 | 2022-03-29 | 新疆德安环保科技股份有限公司 | Oil film removing system and method |
| CN114940561A (en) * | 2022-05-20 | 2022-08-26 | 安徽海螺环保集团有限公司 | Oil sludge treatment waste liquid treatment system |
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