CN110240367B - Sewage treatment system and method for synchronous and efficient removal of carbon, nitrogen and phosphorus - Google Patents
Sewage treatment system and method for synchronous and efficient removal of carbon, nitrogen and phosphorus Download PDFInfo
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- CN110240367B CN110240367B CN201910657353.1A CN201910657353A CN110240367B CN 110240367 B CN110240367 B CN 110240367B CN 201910657353 A CN201910657353 A CN 201910657353A CN 110240367 B CN110240367 B CN 110240367B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000010865 sewage Substances 0.000 title claims abstract description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 42
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 40
- 239000011574 phosphorus Substances 0.000 title claims abstract description 40
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 39
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000007788 liquid Substances 0.000 claims abstract description 65
- 238000006243 chemical reaction Methods 0.000 claims abstract description 51
- 230000000243 photosynthetic effect Effects 0.000 claims abstract description 47
- 239000012528 membrane Substances 0.000 claims abstract description 33
- 238000009292 forward osmosis Methods 0.000 claims abstract description 24
- 239000003011 anion exchange membrane Substances 0.000 claims abstract description 9
- 239000000725 suspension Substances 0.000 claims abstract description 8
- 230000005684 electric field Effects 0.000 claims description 14
- 238000005273 aeration Methods 0.000 claims description 12
- 241000894006 Bacteria Species 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims description 9
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- 230000029553 photosynthesis Effects 0.000 claims description 7
- 238000010672 photosynthesis Methods 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 230000000593 degrading effect Effects 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003204 osmotic effect Effects 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 13
- 241000195493 Cryptophyta Species 0.000 abstract description 11
- 238000000926 separation method Methods 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 description 13
- 231100000719 pollutant Toxicity 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 3
- 239000010405 anode material Substances 0.000 description 3
- 238000012851 eutrophication Methods 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 125000001477 organic nitrogen group Chemical group 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- 239000003225 biodiesel Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005374 membrane filtration Methods 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 241000195649 Chlorella <Chlorellales> Species 0.000 description 1
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 244000062766 autotrophic organism Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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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
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
-
- 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
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/30—Organic compounds
-
- 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
- C02F3/005—Combined electrochemical biological processes
-
- 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
- C02F3/28—Anaerobic digestion processes
-
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
- C02F3/325—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae as symbiotic combination of algae and bacteria
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a sewage treatment system and a sewage treatment method for synchronously and efficiently removing carbon, nitrogen and phosphorus, wherein the system comprises a raw water barrel, an anode chamber, a photosynthetic reaction tank and a liquid drawing tank which are sequentially communicated, an anion exchange membrane is arranged between the anode chamber and the photosynthetic reaction tank, and a forward osmosis membrane is arranged between the photosynthetic reaction tank and the liquid drawing tank; an anode is arranged in the anode chamber, and the photosynthetic reaction tank is filled with microalgae suspension; the liquid drawing pool is filled with liquid drawing, a cathode is arranged in the liquid drawing pool, and the cathode is connected with an anode in the anode chamber through an external circuit. According to the invention, through organically combining the forward osmosis technology, the microalgae denitrification and dephosphorization technology and the bioelectrochemical technology, the high-efficiency separation of carbon, nitrogen and phosphorus and algae water in the synchronous removal of sewage is realized, and meanwhile, the pollution of a forward osmosis membrane algae source can be effectively controlled.
Description
Technical Field
The invention relates to a sewage biological treatment technology, in particular to a sewage treatment system and a sewage treatment method for synchronously and efficiently removing carbon, nitrogen and phosphorus.
Background
With the continuous increase of population numbers and the rapid development of industrial and agricultural production in China, the discharge of human production and domestic sewage is increased, a large amount of environmental pollutants are discharged into water bodies, the environment of the receiving water bodies is accelerated to deteriorate, and in recent years, the eutrophication of the environment of the water bodies in China has a trend of accelerated deterioration, so that the eutrophication of surface water bodies has become one of the core problems of water pollution in China. The pollutants such as nitrogen and phosphorus in the water body are key factors for causing eutrophication of the water body, and the discharge of a large amount of nitrogen and phosphorus-containing sewage is a main cause for increasing the concentration of the nitrogen and phosphorus pollutants in the receiving water body, so that the research and development of the economic and efficient nitrogen and phosphorus removal technology becomes one of important tasks for solving the water pollution problem in China.
At present, the widely adopted denitrification and dephosphorization process of sewage plants in China comprises A 2 And O, SBR and oxidation ditch processes, the traditional nitrogen and phosphorus removal processes have a series of problems of poor nitrogen and phosphorus removal effect, high investment operation cost, low recycling rate and the like although the technology is mature and the process is stable. Algae can effectively absorb nutrient substances such as nitrogen and phosphorus in water through photosynthesis, can effectively remove nitrogen and phosphorus while completing growth metabolism of the algae, and in addition, microalgae have high oil content and high growth rate, and are considered as biodiesel raw materials with the most development prospect.
The microalgae is utilized to treat sewage, so that the efficient removal of nitrogen and phosphorus in the sewage and the harvesting of microalgae biomass can be synchronously realized, however, the microalgae cells are tiny, the density is close to that of the water, the surface is negatively charged, the microalgae cells are in a stable suspension state in the water due to the characteristics, the natural separation is difficult to realize through gravity precipitation like activated sludge, and the insufficient separation of the microalgae can lead to the loss of a large amount of the microalgae cells, so that the treatment effect and the stability of the system are affected. In addition, most microalgae belong to autotrophic organisms, the removal capability of organic pollutants is limited, and the growth of the microalgae is inhibited due to the fact that the concentration of organic matters is too high, so that the microalgae sewage treatment system is often used as a rear unit of an aerobic secondary sewage treatment system and is used for removing nitrogen and phosphorus in secondary effluent, the utilization sequence of the microalgae on nitrogen sources is ammonia nitrogen > organic nitrogen > nitrate nitrogen > nitrite nitrogen, the nitrogen sources in urban sewage mainly exist in the form of ammonia nitrogen and organic nitrogen, after the sewage is treated by the secondary aerobic system, more than 90% of ammonia nitrogen and organic nitrogen are oxidized into nitrate nitrogen or nitrite nitrogen which is not easy to be utilized by algae, and therefore the denitrification efficiency of the microalgae treatment system is reduced, and meanwhile, a large amount of toxic and harmful substances exist in the sewage, so that the activity and the fertility of the microalgae are reduced, and the nitrogen and phosphorus removal efficiency of the system are also influenced.
The membrane filtration technology is combined with the microalgae sewage treatment technology, so that the problems of difficult algae-water separation and low biomass in the traditional microalgae sewage treatment technology can be effectively solved, however, the traditional ultrafiltration and microfiltration membrane cannot effectively intercept pollutants such as low molecular weight organic matters, nitrogen-phosphorus nutritive salts and the like, and when the microalgae in the system have poor pollutant removal effect, the effluent quality can be influenced. In addition, ultrafiltration and microfiltration membranes must be driven by an applied pressure to achieve algae-water separation, which not only results in high operating costs but also results in serious membrane pollution, further increasing the operating and maintenance costs of the system.
Disclosure of Invention
The invention aims to provide a sewage treatment system and a sewage treatment method for synchronously and efficiently removing carbon, nitrogen and phosphorus, which are used for solving the problems of low microalgae activity, low nitrogen and phosphorus removal efficiency, serious membrane pollution and high cost in the traditional membrane filtration technology for separating algae from water in the existing microalgae sewage treatment system.
The invention aims at realizing the following technical scheme: a sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus comprises a raw water barrel, an anode chamber, a photosynthetic reaction tank and a liquid drawing tank which are sequentially communicated, wherein an anion exchange membrane is arranged between the anode chamber and the photosynthetic reaction tank, and a forward osmosis membrane is arranged between the photosynthetic reaction tank and the liquid drawing tank;
an anode is arranged in the anode chamber, and anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode; an anode chamber water inlet pipe and an anode chamber water outlet pipe are arranged on the anode chamber, the anode chamber water inlet pipe is communicated with the raw water barrel, and the anode chamber water outlet pipe is communicated with the photosynthetic reaction tank;
the photosynthetic reaction tank is filled with microalgae suspension, and an aeration device is arranged at the bottom of the photosynthetic reaction tank;
the liquid suction pool is filled with liquid suction, a cathode is arranged in the liquid suction pool, the cathode is connected with an anode in the anode chamber through an external circuit, and a load is arranged on the external circuit; the liquid-drawing tank is provided with an on-line conductivity adjusting device, and a liquid-drawing tank outlet pipe is arranged at the top of the liquid-drawing tank.
The anode is made of carbon cloth, carbon felt, carbon paper, carbon brush or graphite plate, and the anode is arranged in the middle of the anode chamber.
A water inlet pump is arranged between the anode chamber water inlet pipe and the raw water barrel, a liquid level controller is arranged at the top of the photosynthetic reaction tank and is electrically connected with the water inlet pump, and the liquid level controller is used for monitoring the liquid level of the photosynthetic reaction tank and controlling the operation of the water inlet pump according to the liquid level height.
The aeration device is connected with the air pump and is used for providing carbon dioxide into the photosynthetic reaction tank and completely mixing the microalgae suspension.
The cathode of the liquid drawing tank is made of carbon cloth or carbon paper, the cathode is arranged in the side wall of the liquid drawing tank opposite to the forward osmosis membrane, one surface of the cathode facing to outside air is coated with a carbon base layer and a polytetrafluoroethylene layer, and one surface of the cathode facing to the liquid drawing tank is coated with a Pt/C catalyst layer.
A sewage treatment method for synchronously and efficiently removing carbon, nitrogen and phosphorus comprises the following steps:
a. setting the sewage treatment system;
b. starting a water inlet pump to enable sewage in the raw water barrel to enter an anode chamber, degrading part of carbon, nitrogen and phosphorus organic matters in the sewage by anaerobic bacteria and electrogenesis bacteria attached to the surface of the anode, generating electrons by the electrogenesis bacteria and transmitting the electrons to the anode, and forming an internal electric field between the anode and the cathode;
c. after the sewage treated by the anode chamber enters the photosynthetic reaction tank, ammonia nitrogen and phosphorus in the sewage are consumed under the photosynthesis of microalgae, and the sewage is not completely removed in the photosynthetic reaction tankNO removed 3 - And NO 2 - The waste water enters an anode chamber through an anion exchange membrane under the action of an internal electric field, and is further removed under the action of anaerobic bacteria;
d. water molecules in the photosynthetic reaction tank penetrate through the forward osmosis membrane to enter the liquid drawing tank under the osmotic pressure of the liquid drawing, and overflow water outlet is realized through a liquid drawing water outlet pipe at the top of the liquid drawing tank.
The aeration device provides carbon dioxide for the microalgae and enables organic matters in the sewage to be fully mixed and contacted with the microalgae.
The internal electric field keeps negatively charged organic matters away from the forward osmosis membrane, and inhibits the forward osmosis membrane from being polluted.
The beneficial effects of the invention are as follows: the anode chamber, the photosynthetic reaction tank and the liquid drawing tank provided by the invention respectively play roles in degrading organic matters, removing nitrogen and phosphorus and separating algae and water, and the combined effect of the three reaction chambers can realize synchronous and efficient removal of carbon, nitrogen and phosphorus in sewage. The electrogenesis microorganism in the anode chamber can effectively degrade organic matters in sewage and generate electric energy, meanwhile, the anaerobic environment of the anode chamber can prevent ammonia nitrogen in the sewage from being oxidized into nitrate nitrogen which is not easy to be utilized by algae, the microalgae metabolism in the photosynthetic reaction tank can realize the efficient removal of nitrogen and phosphorus pollutants in the sewage, and the interception effect of the forward osmosis membrane can enable algae water to be separated efficiently, so that the high-quality effluent of the system is finally realized. In addition, the internal electric field generated between the anode material and the cathode material can generate an electric stimulation effect on microalgae cells, and can effectively improve the activity of microalgae, so that the pollutant removal efficiency is improved, and the electric field can drive NO which is not completely removed in the photosynthetic reaction tank 3 - And NO 2 - And the waste water enters an anaerobic anode chamber through an anion exchange membrane so as to be further removed. The electric field generated between the anode and the cathode can also drive membrane surface contaminants attached to the surface of the forward osmosis membrane to separate from the surface of the membrane, thereby slowing down the occurrence of membrane contamination.
The invention organically combines the forward osmosis technology, the microalgae denitrification and dephosphorization technology and the bioelectrochemical technology, realizes the efficient separation of carbon, nitrogen and phosphorus removal and algae water in the sewage synchronously, and simultaneously can effectively control the algae source pollution of the forward osmosis membrane.
Drawings
FIG. 1 is a schematic diagram of a sewage treatment system according to the present invention.
In the figure: 1-a raw water barrel; 2-a water inlet pump; 3-an anode chamber; 4-an anode chamber water inlet pipe; 5-anode; 6, an anode chamber water outlet pipe; 7-an anion exchange membrane; 8-a photosynthetic reaction tank; 9, an aeration device; 10-an air pump; 11-a liquid level controller; 12-a forward osmosis membrane; 13-a liquid bath; 14-draining pipe of liquid-drawing pool; 15-cathode; 16-an on-line conductivity adjusting device; 17-conducting wires; 18-load.
Detailed Description
As shown in figure 1, the integrated forward osmosis membrane-photosynthetic bioelectrochemical system for synchronously and efficiently removing carbon, nitrogen and phosphorus in sewage comprises a raw water bucket 1, an anode chamber 3, a photosynthetic reaction tank 8 and a liquid drawing tank 13 which are sequentially communicated; the anode chamber 1, the photosynthetic reaction tank 8 and the liquid drawing tank 13 are arranged side by side in parallel, the anode chamber 1 and the photosynthetic reaction tank 8 are separated by an anion exchange membrane 7, and the photosynthetic reaction tank 8 and the liquid drawing tank 13 are separated by a forward osmosis membrane 12. In the embodiment, the raw water barrel 1, the anode chamber 3, the photosynthetic reaction tank 8 and the liquid drawing tank 13 are all made of organic glass, the volumes of the anode chamber 3, the photosynthetic reaction tank 8 and the liquid drawing tank 13 are 5L, 5L and 2.5L respectively, the lengths, the widths and the heights of the anode chamber 3 and the photosynthetic reaction tank 8 are 18cm, 10cm and 28cm respectively, and the lengths, the widths and the heights of the liquid drawing tank 13 are 18cm, 5cm and 28cm respectively.
An anode 5 is arranged in the anode chamber 3, anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode 5, and the anaerobic bacteria are denitrifying bacteria and the like; the anode chamber water inlet pipe 4 and the anode chamber water outlet pipe 6 are respectively positioned at the lower part of the left side wall and the upper part of the right side wall of the anode chamber 1, the water inlet end of the water inlet pump 2 is connected with the water outlet pipe of the raw water barrel 1, and the water outlet end of the water inlet pump 2 is connected with the anode chamber water inlet pipe 4. The anode material is made of carbon cloth, carbon felt, carbon paper, carbon brush or graphite plate, and the anode is arranged at the central axis of the anode chamber.
The photosynthetic reaction tank 8 is filled with microalgae suspension, and an aeration device 9 is arranged at the bottom of the photosynthetic reaction tank 8; the aeration device 9 is connected with an air pump 10, and the aeration device 9 is used for providing carbon dioxide into the photosynthetic reaction tank 8 and completely mixing the microalgae suspension. The top of the photosynthetic reaction tank is provided with a liquid level controller (liquid level relay) 11, the liquid level controller 11 is electrically connected with the water inlet pump 2, and the liquid level controller 11 is used for monitoring the liquid level of the photosynthetic reaction tank 8 and controlling the operation of the water inlet pump 2 according to the liquid level height.
The liquid-drawing tank 13 contains liquid-drawing liquid, a cathode 15 is arranged in the liquid-drawing tank 13, the cathode 15 is connected with the anode 5 in the anode chamber through a lead 17, and a load 18 is arranged on the lead 17. The cathode 15 is positioned on the side wall of the liquid-drawing tank opposite to the forward osmosis membrane 12, and the cathode 15 can be made of carbon cloth or carbon paper coated with a waterproof and air-permeable layer and a catalyst layer. The distance between the anode 5 and the cathode 15 was 17cm. The liquid-drawing tank 13 is provided with an on-line conductivity adjusting device 16, and a probe of the on-line conductivity adjusting device 16 is immersed in the liquid-drawing liquid, and the conductivity of the liquid-drawing liquid is monitored on line and the addition amount of the high-concentration liquid-drawing liquid is controlled to adjust the conductivity of the liquid-drawing liquid in the liquid-drawing tank so as to maintain the conductivity within a prescribed range. A liquid-drawing tank outlet pipe 14 is arranged at the top of the liquid-drawing tank.
When the invention is applied, the sewage containing organic matters, ammonia nitrogen and phosphorus in the raw water barrel 1 is pumped into the anode chamber 3 through the anode chamber water inlet pipe 4 by the water inlet pump 2, partial organic matters in the sewage are degraded by common anaerobic bacteria and electrogenesis bacteria attached to the surface of the anode 5 in the anode chamber 3, and the electrogenesis bacteria generate electrons and transfer the electrons to anode materials while degrading the organic matters, and then transfer the electrons to the cathode 15 through an external circuit to form current, so that an internal electric field is formed between the anode 5 and the cathode 15.
The chlorella in the photosynthetic reaction tank 8 is subjected to photosynthesis under the illumination condition to consume ammonia nitrogen and phosphorus in the sewage, so that the nitrogen and phosphorus can be effectively removed. In addition, NO which is not completely removed in the photosynthetic reaction cell 8 3 - And NO 2 - The wastewater enters the anaerobic anode chamber 3 through the anion exchange membrane 7 under the action of the electric field force, and is further removed under the action of denitrifying bacteria. The air pump 10 pumps air into the photosynthesis through the aeration device 9 at the bottom of the photosynthesis reaction tank 8A reaction tank 8 for providing CO for microalgae by aeration 2 The microalgae mixed solution is ensured to be in a complete mixing state, the microalgae is prevented from sinking, and meanwhile, the disturbance effect of the microalgae mixed solution can promote the contact between pollutants and the microalgae, so that the pollutant removal efficiency is improved.
The water molecules in the photosynthetic reaction tank 8 enter the liquid drawing tank 13 through the forward osmosis membrane 12 under the driving of the osmotic pressure of the liquid drawing liquid in the liquid drawing tank 13, overflow water is realized through the liquid drawing water outlet pipe 14, and pollutants such as organic matters, nitrogen and phosphorus nutrient salts and the like which are not removed in the photosynthetic reaction tank 8 can be effectively trapped by the forward osmosis membrane 12, so that high-quality water outlet is ensured. In the running process, negatively charged pollutants such as microalgae cells and microalgae extracellular organic matters can adhere and deposit on the surface of the forward osmosis membrane 12 to cause membrane pollution, so that the membrane effluent flux is influenced, and the electric field generated between the anode 5 and the cathode 15 in the system can lead the negatively charged key membrane pollutants to be subjected to the electric field force in the direction away from the surface of the membrane, so as to play a role in inhibiting the membrane pollution. In addition, the action of the electric field can stimulate the metabolic activity of the microalgae and strengthen the removal of nitrogen and phosphorus nutrient salts by the microalgae. Microalgae collected by the system can be used for preparing biodiesel, so that the recycling of pollutants in sewage is realized.
Claims (6)
1. The sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus is characterized by comprising a raw water barrel, an anode chamber, a photosynthetic reaction tank and a liquid drawing tank which are sequentially communicated, wherein an anion exchange membrane is arranged between the anode chamber and the photosynthetic reaction tank, and a forward osmosis membrane is arranged between the photosynthetic reaction tank and the liquid drawing tank;
an anode is arranged in the anode chamber, and anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode; an anode chamber water inlet pipe and an anode chamber water outlet pipe are arranged on the anode chamber, the anode chamber water inlet pipe is communicated with the raw water barrel, and the anode chamber water outlet pipe is communicated with the photosynthetic reaction tank;
the photosynthetic reaction tank is filled with microalgae suspension, and an aeration device is arranged at the bottom of the photosynthetic reaction tank;
the liquid suction pool is filled with liquid suction, a cathode is arranged in the liquid suction pool, the cathode is connected with an anode in the anode chamber through an external circuit, and a load is arranged on the external circuit; the liquid suction pool is provided with an on-line conductivity adjusting device, and a liquid suction pool outlet pipe is arranged at the top of the liquid suction pool;
the anode is made of carbon cloth, carbon felt, carbon paper, carbon brush or graphite plate, and is arranged in the middle of the anode chamber;
a water inlet pump is arranged between the anode chamber water inlet pipe and the raw water barrel, a liquid level controller is arranged at the top of the photosynthetic reaction tank and is electrically connected with the water inlet pump, and the liquid level controller is used for monitoring the liquid level of the photosynthetic reaction tank and controlling the operation of the water inlet pump according to the liquid level height.
2. The wastewater treatment system for synchronous and efficient removal of carbon, nitrogen and phosphorus according to claim 1, wherein the aeration device is connected with an air pump and is used for supplying carbon dioxide to the photosynthetic reaction tank and completely mixing the microalgae suspension.
3. The sewage treatment system for synchronous and efficient removal of carbon, nitrogen and phosphorus according to claim 1, wherein the cathode of the liquid drawing tank is made of carbon cloth or carbon paper, the cathode is arranged in the side wall of the liquid drawing tank opposite to the forward osmosis membrane, one surface of the cathode facing to the outside air is coated with a carbon-based layer and a polytetrafluoroethylene layer, and the surface of the cathode facing to the liquid drawing tank is coated with a Pt/C catalyst layer.
4. A sewage treatment method for synchronously and efficiently removing carbon, nitrogen and phosphorus is characterized by comprising the following steps:
a. setting the sewage treatment system according to any one of claims 1 to 3;
b. starting a water inlet pump to enable sewage in the raw water barrel to enter an anode chamber, degrading part of carbon, nitrogen and phosphorus organic matters in the sewage by anaerobic bacteria and electrogenesis bacteria attached to the surface of the anode, generating electrons by the electrogenesis bacteria and transmitting the electrons to the anode, and forming an internal electric field between the anode and the cathode;
c. after the sewage treated by the anode chamber enters the photosynthesis reaction tank, photosynthesis of microalgae is performedThe ammonia nitrogen and the phosphorus in the sewage are consumed down, and NO which is not completely removed in the photosynthetic reaction tank 3 - And NO 2 - The waste water enters an anode chamber through an anion exchange membrane under the action of an internal electric field, and is further removed under the action of anaerobic bacteria;
d. water molecules in the photosynthetic reaction tank penetrate through the forward osmosis membrane to enter the liquid drawing tank under the osmotic pressure of the liquid drawing, and overflow water outlet is realized through a liquid drawing water outlet pipe at the top of the liquid drawing tank.
5. The method for treating sewage by synchronously and efficiently removing carbon, nitrogen and phosphorus according to claim 4, wherein the aeration device provides carbon dioxide for microalgae and enables organic matters in the sewage to be in full mixed contact with the microalgae.
6. The method for treating sewage by synchronously and efficiently removing carbon, nitrogen and phosphorus according to claim 4, wherein the internal electric field keeps negatively charged organic matters away from the forward osmosis membrane and inhibits the pollution of the forward osmosis membrane.
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| CN112573667B (en) * | 2021-01-05 | 2023-08-25 | 浙江大学 | Sewage treatment device and method based on algae-bacteria symbiotic electrochemical system |
| CN113150944A (en) * | 2021-03-25 | 2021-07-23 | 青海师范大学 | Biological reaction system and method for producing microalgae by using agricultural wastewater and waste gas |
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