CN118145800B - Phosphorus-containing wastewater treatment system - Google Patents
Phosphorus-containing wastewater treatment systemInfo
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- CN118145800B CN118145800B CN202410262668.7A CN202410262668A CN118145800B CN 118145800 B CN118145800 B CN 118145800B CN 202410262668 A CN202410262668 A CN 202410262668A CN 118145800 B CN118145800 B CN 118145800B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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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
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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Abstract
本发明涉及水处理技术领域，尤其涉及含磷废水处理系统。该处理系统由下至上依次包括：生物除磷反应单元、电生物氧化吸附单元和气体膜分离单元；生物除磷反应单元包括并列布置的厌氧池和好氧池；电生物氧化吸附单元包括并列设置的电生物磷氧化池和折流式吸附池；电生物磷氧化池设置于厌氧池上方，其底部通过第一排气口与厌氧池内部相连通；折流式吸附池设置于好氧池上方，其底部通过第二排气口与好氧池内部相连通；气体膜分离单元位于折流式吸附池上方，底部通过第四排气口与折流式吸附池内相连通。该含磷废水处理系统在对含磷废水进行生物除磷的同时，还可以实现对伴随产生的磷化氢气体和生物气溶胶进行处理，有助于消除安全隐患、保护大气环境。
This invention relates to the field of water treatment technology, and more particularly to a phosphorus-containing wastewater treatment system. The system comprises, from bottom to top: a biological phosphorus removal reaction unit, an electrobiological oxidation adsorption unit, and a gas membrane separation unit. The biological phosphorus removal reaction unit includes an anaerobic tank and an aerobic tank arranged in parallel. The electrobiological oxidation adsorption unit includes an electrobiological phosphorus oxidation tank and a baffled adsorption tank arranged in parallel. The electrobiological phosphorus oxidation tank is located above the anaerobic tank, and its bottom is connected to the interior of the anaerobic tank through a first exhaust port. The baffled adsorption tank is located above the aerobic tank, and its bottom is connected to the interior of the aerobic tank through a second exhaust port. The gas membrane separation unit is located above the baffled adsorption tank, and its bottom is connected to the interior of the baffled adsorption tank through a fourth exhaust port. This phosphorus-containing wastewater treatment system, while performing biological phosphorus removal from phosphorus-containing wastewater, can also treat the accompanying phosphine gas and bioaerosols, helping to eliminate safety hazards and protect the atmospheric environment.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a phosphorus-containing wastewater treatment system.
Background
Phosphorus is the main nutrient element causing eutrophication of water. Eutrophication of water body not only can lead to the growth of algae in the water body, but also can lead to the rapid decrease of oxygen content in the water body, and the survival of aquatic organisms such as fishes and the like is affected. Phosphorus mainly comes from domestic sewage, industrial wastewater, soil fertilizer soil loss and the like. In domestic sewage, the phosphorus content of various detergents is about 70%. Wastewater discharged from industries such as chemical industry, papermaking, rubber, dye and textile printing and dyeing, pesticide, coking, petrochemical industry, fermentation, medicine and medical treatment, food and the like often contains organic phosphorus compounds.
The dephosphorization method of the phosphorus-containing wastewater can be divided into a physicochemical dephosphorization method, a biological dephosphorization method and an artificial wetland dephosphorization method. Compared with a physical-chemical dephosphorization method, the biological dephosphorization method basically does not need to add extra chemical agents, and compared with an artificial wetland dephosphorization method, the equipment occupation area is relatively small, so that at present, a sewage treatment plant generally adopts the biological dephosphorization method to treat phosphorus-containing wastewater. The biological phosphorus removal method utilizes the biochemical effect of phosphorus accumulating bacteria to remove phosphorus, and the principle is that the phosphorus accumulating bacteria can fully release the polymeric phosphate in the cell body under the anaerobic condition, can absorb phosphorus from water under the aerobic condition and convert the phosphorus into the characteristic of the polymeric phosphate in the cell body, so as to form phosphorus-rich biological sludge, and the phosphorus-rich sludge is discharged from the system through precipitation, thereby achieving the effect of removing phosphorus from wastewater. In recent years, along with the promotion of environmental protection consciousness and health consciousness of people, how to further optimize the environmental protection performance of the biological phosphorus removal method, and the reduction of potential safety hazards are more and more paid attention to by people in the field.
Disclosure of Invention
In order to solve or partially solve the problems in the related art, the present invention provides a phosphorus-containing wastewater treatment system.
The invention provides a phosphorus-containing wastewater treatment system which sequentially comprises a biological phosphorus removal reaction unit, an electrobiological oxidation adsorption unit and a gas membrane separation unit from bottom to top,
The biological phosphorus removal reaction unit comprises an anaerobic tank and an aerobic tank which are arranged in parallel, wherein the anaerobic tank is provided with a first water inlet and a first water outlet, the aerobic tank is provided with a second water inlet, a second water outlet and an aeration port, the first water outlet is connected with the second water inlet through a transfusion pipeline, and a first circulating pump is arranged on the transfusion pipeline;
The electrobiological oxidation adsorption unit comprises an electrobiological phosphorus oxidation tank and a baffling adsorption tank which are arranged in parallel, wherein the electrobiological phosphorus oxidation tank is arranged above the anaerobic tank, and the bottom of the electrobiological phosphorus oxidation tank is communicated with the inside of the anaerobic tank through a first exhaust port;
The electric biological phosphorus oxidation tank is characterized in that a spray liquid inlet is arranged at the upper part of the electric biological phosphorus oxidation tank, a third water outlet is arranged at the lower part of the electric biological phosphorus oxidation tank, a reaction zone is arranged between the spray liquid inlet and the third water outlet, biological filler and an electrode are arranged in the reaction zone, the biological filler is porous filler which is pre-inoculated with an electric active strain, the electrode is externally connected with a power supply, the spray liquid inlet is connected with a first circulating pipeline, a second circulating pump is arranged on the first circulating pipeline, the third water outlet is connected with a transfusion pipeline through the second circulating pipeline, and a third exhaust port is arranged at the top of the electric biological phosphorus oxidation tank;
The baffle type adsorption tank is internally provided with adsorption filler and a vertical baffle plate, and the top of the baffle type adsorption tank is provided with a fourth exhaust port;
The gas membrane separation unit is positioned above the baffled adsorption tank, a gas separation membrane component is arranged in the gas membrane separation unit, the bottom of the gas membrane separation unit is communicated with the baffled adsorption Chi Naxiang through a fourth exhaust port, an oxygen-enriched outlet and a fifth exhaust port are arranged on the upper part of the gas membrane separation unit, the oxygen-enriched outlet is connected with an aeration port, and an air pump is arranged between the oxygen-enriched outlet and the aeration port.
Further, in the anaerobic tank, the first water inlet is positioned below the first water outlet, and a first horizontal baffle plate is arranged between the first water inlet and the first water outlet in the anaerobic tank.
Further, in the aerobic tank, the second water outlet is positioned above the aeration opening, the aeration opening is positioned above the first water inlet, an aeration pipe, a second horizontal baffle plate and a membrane assembly are arranged in the aerobic tank, the aeration pipe is communicated with the aeration opening, a plurality of aeration holes are uniformly distributed on the surface of the aeration pipe along the horizontal direction, the second horizontal baffle plate is arranged between the aeration pipe and the second water inlet, the membrane assembly is arranged above the aeration pipe, an outlet of the membrane assembly forms the second water outlet, and a sludge discharge opening is further arranged at the bottom of the aerobic tank.
Further, the membrane module is a hollow fiber membrane module or a roll-type membrane module.
Further, a supporting plate is arranged in the electrobiological phosphorus oxidation tank and is positioned above the third water outlet, the biological filler is supported by the supporting plate, and a plurality of air guide holes are uniformly formed in the supporting plate.
Further, the porous filler is polyurethane.
Further, a spray pipe is arranged in the electrobiological phosphorus oxidation tank and connected with a spray liquid inlet, and a plurality of groups of spray heads are uniformly arranged on the spray pipe along the horizontal direction.
Further, the electroactive strain is one or two of pseudomonas aeruginosa and bacillus.
Further, the electrode is a graphite electrode, a carbon felt electrode or a carbon fiber electrode, and the electrode is arranged along the horizontal direction.
Further, in the baffling type adsorption tank, the adsorption filler is activated carbon, ceramsite, diatomite, quartz sand or molecular sieve.
The phosphorus-containing wastewater treatment system provided by the invention can have the following beneficial effects:
1. the phosphorus-containing wastewater treatment system is of a longitudinal three-layer structure, fully utilizes the space in the vertical direction and the upward movement characteristic of gas, simplifies the design of a gas pipeline, and reduces the duty area of equipment.
2. The electric biological phosphorus oxidation tank and the baffling adsorption tank are arranged above the biological phosphorus removal reaction unit in the treatment system and are respectively used for treating phosphine generated in the anaerobic treatment process and biological aerosol generated in the aerobic treatment process. Therefore, the phosphorus-containing wastewater treatment system can treat phosphine gas and biological aerosol which are generated simultaneously while biologically dephosphorizing phosphorus-containing wastewater, and is beneficial to eliminating potential safety hazards and protecting the atmospheric environment.
3. A part of liquid discharged from the aerobic tank of the treatment system is returned to the electrobiological phosphorus oxidation tank to be used as nutrient solution and conductive liquid of the electrobiological phosphorus oxidation tank. After the gas exhausted from the baffling adsorption tank is separated and treated by the gas membrane separation unit, the treatment system returns the oxygen-enriched air to the aerobic tank as supplementary aeration, so that the energy consumption can be saved. Thus, the treatment system also achieves reuse of oxygen resources and phosphorus resources.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
FIG. 1 is a schematic diagram of a phosphorus-containing wastewater treatment system according to an embodiment of the present invention.
Description of the reference numerals
1-Anaerobic tank
11-First water inlet
12-First water outlet
13-First exhaust port
14-First horizontal baffle
2-Aerobic tank
21-Second water inlet
22-Second water outlet
23-Aeration port
24-Second exhaust port
25-Aeration pipe
26-Second horizontal baffle
27-Membrane Assembly
28-Mud discharging port
3-Electric biological phosphorus oxidation tank
31-Third water outlet
32-Biological packing
33-Electrode
34-Third exhaust port
35-Shower pipe
36-Support plate
4-Baffling type adsorption tank
41-Fourth exhaust port
42-Adsorption packing
43-Vertical baffle
5-Gas membrane separation unit
51-Oxygen-enriched outlet
52-Fifth exhaust port
53-Gas separation membrane module
P1-infusion pipeline
P2-first circulation pipeline
P3-second circulation pipeline
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the invention. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The inventor of the present application has found that although biological phosphorus removal has a better treatment effect on phosphorus in sewage, microorganisms are different from chemical agents, and have the characteristics of vitality and metabolization, so that other pollutants, mainly phosphine gas and biological aerosol, are generated, and the two pollutants directly enter the atmosphere to pollute the surrounding environment and harm the health of human bodies. Specific:
It has been found that obligate anaerobic bacteria, such as phosphate-reducing bacteria, are capable of reducing organic phosphorus compounds and inorganic phosphates in the environment to phosphine in an anaerobic environment. Phosphine is a gaseous, colorless, highly toxic inorganic compound. Pure phosphine gas is colorless and odorless, but often has acetylene taste or garlic taste or rotten fish taste when metal phosphide produces phosphine gas. Inhalation of phosphine can have an effect on the heart, respiratory system, kidneys, intestines and stomach, nervous system and liver. The phosphine gas discharged into the air can pollute the surrounding environment and harm the health of human bodies.
The biological dephosphorization sewage treatment system contains a large amount of microorganisms, the microorganisms with smaller particle diameters in sewage or sludge are scattered into the surrounding air to form biological aerosol because of being disturbed by aeration and oxygenation or stirring of mechanical equipment. In addition, a large number of microorganisms are contained in the bioreactor for treating the waste gas, and the microorganisms attached to the surface of the filler are carried and discharged out of the bioreactor due to the impact of the inlet air flow, so that the discharge of bioaerosols is also caused. Bioaerosols generally refer to aerosols containing biologically active substances such as microorganisms or biomacromolecules having aerodynamic diameters within 100 μm, including bacteria, fungi, viruses, endotoxins, and mold spores, fern spores, protozoa, etc., and have infectivity and sensitization properties in addition to the characteristics of conventional aerosols. There are about 500 pathogens worldwide, more than 100 are transmitted through aerosol, and the human health is endangered. Recent studies have found that microbial aerosols are also important precursors for haze formation.
Therefore, the inventor considers that the phosphine waste gas and the biological aerosol are cooperatively treated while the sewage treatment is carried out on the phosphorus-containing wastewater by adopting a biological phosphorus removal method, and the method has important significance in eliminating potential safety hazards and protecting the atmospheric environment.
The embodiment of the invention provides a phosphorus-containing wastewater treatment system, referring to fig. 1, which sequentially comprises a biological phosphorus removal reaction unit, an electrobiological oxidation adsorption unit and a gas membrane separation unit 5 from bottom to top, wherein,
The biological phosphorus removal reaction unit comprises an anaerobic tank 1 and an aerobic tank 2 which are arranged in parallel, wherein the anaerobic tank 1 is provided with a first water inlet 11 and a first water outlet 12, the aerobic tank 2 is provided with a second water inlet 21, a second water outlet 22 and an aeration port 23, the first water outlet 12 is connected with the second water inlet 21 through a liquid delivery pipeline P1, a first circulating pump is arranged on the liquid delivery pipeline P1, the second water outlet 22 is connected with a liquid discharge pipeline and a first circulating pipeline P2, and the tops of the anaerobic tank 1 and the aerobic tank 2 are respectively provided with a first air outlet 13 and a second air outlet 24;
The electrobiological oxidation adsorption unit comprises an electrobiological phosphorus oxidation tank 3 and a baffled adsorption tank 4 which are arranged in parallel, wherein the electrobiological phosphorus oxidation tank 3 is arranged above the anaerobic tank 1, and the bottom of the electrobiological phosphorus oxidation tank is communicated with the interior of the anaerobic tank 1 through a first exhaust port 13;
The upper part of the electrobiological phosphorus oxidation tank 3 is provided with a spray liquid inlet, the lower part of the electrobiological phosphorus oxidation tank is provided with a third water outlet 31, a reaction zone is arranged between the spray liquid inlet and the third water outlet 31, a biological filler 32 and an electrode 33 are arranged in the reaction zone, the biological filler 32 is porous filler which is pre-inoculated with an electroactive strain, the electrode 33 is externally connected with a power supply, the spray liquid inlet is connected with a first circulating pipeline P2, a second circulating pump is arranged on the first circulating pipeline P2, the third water outlet 31 is connected with a transfusion pipeline P1 through a second circulating pipeline P3, and the top of the electrobiological phosphorus oxidation tank 3 is provided with a third exhaust port 34;
the baffle type adsorption tank 4 is internally provided with an adsorption filler 42 and a vertical baffle plate 43, and the top of the baffle type adsorption tank is provided with a fourth exhaust port 41;
The gas membrane separation unit 5 is arranged above the baffled adsorption tank 4, a gas separation membrane component 53 is arranged in the gas membrane separation unit, the bottom of the gas membrane separation unit is communicated with the inside of the baffled adsorption tank 4 through a fourth exhaust port 41, an oxygen-enriched outlet 51 and a fifth exhaust port 52 are arranged at the upper part of the gas membrane separation unit 5, the oxygen-enriched outlet 51 is connected with the aeration port 23, and an air pump is arranged between the oxygen-enriched outlet 51 and the aeration port 23.
The phosphorus-containing wastewater treatment system provided by the embodiment of the invention has a three-layer structure, fully utilizes the space in the vertical direction and the upward movement characteristic of gas, and simplifies the design of a gas pipeline. Specifically, the lowest layer is a biological phosphorus removal reaction unit, the middle layer is an electrobiological oxidation adsorption unit, and the uppermost layer is a gas membrane separation unit 5. The biological phosphorus removal reaction unit is used for carrying out phosphorus removal treatment on sewage, and the electric biological oxidation adsorption unit is arranged above the biological phosphorus removal reaction unit and is used for purifying phosphine and biological aerosol generated in the liquid phosphorus removal treatment process. The gas membrane separation unit 5 is used for reprocessing the purified gas to realize the recycling of oxygen. At the same time, a part of the liquid discharged from the aerobic tank 2 is returned to the electrobiological phosphorus oxidation tank 3 as a nutrient solution and a conductive liquid. Therefore, the phosphorus-containing wastewater treatment system can treat phosphine gas and biological aerosol which are generated along with the phosphorus-containing wastewater while biologically removing phosphorus, and is beneficial to eliminating potential safety hazards and protecting the atmospheric environment. And the whole system also realizes the recycling of oxygen resources and phosphorus resources.
The biological phosphorus removal reaction unit comprises an anaerobic tank 1 and an aerobic tank 2 which are arranged in parallel, wherein phosphorus accumulating bacteria in the anaerobic tank 1 degrade organic matters in wastewater through nucleoside triphosphates to release phosphorus accumulated in cells. The organic matters in the sewage provide a carbon source required by the phosphorus accumulating bacteria for respiration. Under anaerobic conditions, the phosphorus accumulating bacteria can utilize organic matters in sewage to carry out energy metabolism. The sewage enters the anaerobic tank 1 and contacts with the activated sludge in the tank, so that the organic matters in the sewage are quickly converted. In the aerobic tank 2, phosphorus accumulating bacteria fully excessively absorb phosphorus under aerobic conditions, and then part of phosphorus is removed from sewage through the sludge discharge port 28, so that the aim of reducing the phosphorus content of the sewage can be achieved. In order to save the occupied space of the biological dephosphorization reaction unit and simplify the structure, a baffle plate can be arranged in the microorganism treatment tank to separate the microorganism treatment tank into an anaerobic tank 1 and an aerobic tank 2.
The anaerobic tank 1 is preferably an upflow anaerobic tank, that is, the first water inlet 11 of the first anaerobic tank 1 is positioned below the first water outlet 12, sewage enters from the lower part of the anaerobic tank 1 and overflows from the upper part, so that a solid retention period and a microorganism retention period which are much higher than a hydraulic retention period can be obtained, and the decomposition rate of organic matters and the efficiency of an anaerobic zone are improved. Referring to fig. 1, the anaerobic tank 1 is also preferably provided with a first horizontal baffle 14 between the first water inlet 11 and the first water outlet 12. By arranging the horizontal baffle plate, the water flow is guided to be in an upflow state, which is helpful for further improving the decomposition rate of organic matters and the reaction efficiency of the anaerobic tank. As a preferable scheme of the embodiment, one end of the first horizontal baffle plate 14 is connected with the side wall of the anaerobic tank 1, and a gap of 50-100 mm is reserved between the other end and the opposite side wall. Phosphine gas generated in the sewage treatment process of the anaerobic tank 1 enters the electrobiological phosphorus oxidation tank 3 through the first exhaust port 13 for waste gas treatment.
After being discharged through the first water outlet 12, the sewage discharged from the anaerobic tank 1 is connected to the second water inlet 21 of the aerobic tank 2 through the infusion pipeline P1 and the first circulating pump, and then aerobic treatment is carried out. The aerobic tank 2 is also preferably an upflow anaerobic tank. Further, in the aerobic tank 2, the second water outlet 22 is positioned above the aeration opening 23, the aeration opening 23 is positioned above the first water inlet 11, and the aerobic tank 2 is internally provided with an aeration pipe 25, a second horizontal baffle plate 26 and a membrane assembly 27. Wherein, aeration pipe 25 is linked together with aeration mouth 23, and it sets up along the horizontal direction, and the surface evenly has arranged a plurality of aeration holes for carry out the even aeration to good oxygen pond 2, and the aperture of aeration hole is preferably 2~45mm. The second horizontal baffle plate 26 is arranged between the aeration pipe 25 and the second water inlet 21, the second horizontal baffle plate 26 is arranged above the second water inlet 21 to guide water flow and prolong the residence time of sewage in the aerobic tank 2, and the second horizontal baffle plate 26 is arranged below the aeration pipe 25 to prevent air/oxygen from the aeration pipe 25 from entering the anaerobic tank 1, thereby being beneficial to keeping the anaerobic state in the anaerobic tank 1. The bottom of the aerobic tank 2 is also provided with a sludge discharge port 28 for removing part of phosphorus from the sewage. As a preferable scheme of the embodiment, one end of the second horizontal baffle plate 26 is connected with the side wall of the aerobic tank 2, and a gap of 50-100 mm is reserved between the other end and the opposite side wall. The membrane module 27 is disposed above the aerator pipe 25, and the outlet thereof forms the second water outlet 22, and as will be understood by those skilled in the art, the inlet of the membrane module 27 is disposed above the aerator pipe 25. The membrane component 27 is used for solid-liquid separation, intercepting phosphorus accumulating bacteria in the aerobic tank 2, preventing bacteria from losing, controlling SS in the effluent, and omitting a sedimentation tank. Further preferably, the membrane module 27 is preferably a hollow fiber membrane module, a flat plate membrane module, a spiral wound membrane module, a tubular membrane module or a pleated filter element module. The membrane material may be a polyolefin membrane, a polyethylene membrane, a polyacrylonitrile membrane, a polysulfone membrane, or an aromatic polyamide membrane. Microorganism aerosol generated in the sewage treatment process of the aerobic tank 2 enters the baffled adsorption tank 4 through the second exhaust port 24 for treatment.
The electrobiological oxidation adsorption unit positioned on the second layer comprises an electrobiological phosphorus oxidation tank 3 and a baffled adsorption tank 4 which are arranged in parallel and are respectively used for treating phosphine gas discharged from the anaerobic tank 1 and microorganism aerosol discharged from the aerobic tank 2. Specific:
The common phosphine oxidizing bacteria utilize oxygen to oxidize the phosphine to phosphate, and during this process the phosphine releases electrons and the oxygen receives electrons. The bottom of the electrobiological phosphorus oxidation tank 3 is communicated with the inside of the anaerobic tank 1 through the first exhaust port 13, so that the oxygen content in the tank is low, the decomposition of phosphine is difficult to realize by oxidizing bacteria of common phosphine, and if oxygen is supplemented into the tank, the anaerobic environment of the anaerobic tank 1 can be destroyed because the electrobiological phosphorus oxidation tank 3 is communicated with the anaerobic tank 1. To solve this contradiction, phosphine gas is treated by electroactive microorganisms in this example. The reaction area in the electrobiological phosphorus oxidation tank 3 is cultivated with electroactive microorganisms through the biological filler 32, the electroactive microorganisms (such as pseudomonas aeruginosa and bacillus) can be enriched on the surface of the electrode 33 and grow rapidly around the electrode under the stimulation of the electrified electrode, the electroactive microorganisms have the capability of obtaining electrons from outside cells, the electron transfer speed is high, and the phosphine conversion efficiency is high under the anaerobic condition. In order to increase the content of the electroactive microorganisms in the reaction zone, the reaction zone is provided with a biological filler 32 and an electrode 33, the biological filler 32 is used for adsorbing and bearing the electroactive microorganisms, and the electrode 33 promotes the growth of the electroactive microorganisms through an external power supply. The porous filler is pre-inoculated with one or two of pseudomonas aeruginosa and bacillus. In order to further optimize the phosphine removal effect, the porous filler is also preferably pre-inoculated with one or more species of the genus bacteroides, methanogens, chrysobacterium, stenotrophomonas, pediococcus. The electrode 33 is preferably a graphite electrode, a carbon felt electrode or a carbon fiber electrode, and the electrode 33 is arranged in a horizontal direction, which is advantageous in increasing the contact area between the gas and the microorganisms on the electrode 33.
The upper part of the electrobiological phosphorus oxidation tank 3 is also provided with a spray liquid inlet, water treated by the aerobic tank 2 is discharged through a second water outlet 22 and then is divided into two parts, one part is discharged through a liquid discharge pipeline, and the other part is connected with the spray liquid inlet through a first circulating pipeline P2 and is contacted with a reaction zone in a spraying mode. Preferably, a spray pipe 35 is arranged in the electrobiological phosphorus oxidation tank 3, the spray pipe 35 is connected with a spray liquid inlet, and a plurality of groups of spray heads are uniformly arranged on the spray pipe 35 along the horizontal direction. The spray heads are arranged, so that the spray liquid in the reaction zone is distributed more uniformly. Further, each group of the spray heads is provided with two spray heads, the included angle between the two spray heads and the vertical surface is 45 degrees, and the included angle between the two spray heads is 90 degrees.
The lower part of the electrobiological phosphorus oxidation tank 3 is also provided with a third water outlet 31, redundant spray liquid and liquid formed by microbial conversion of phosphine are discharged through the third water outlet 31, and the liquid discharged from the third water outlet 31 contains more microorganisms, so that the third water outlet 31 is connected to a transfusion pipeline P1 through a second circulation pipeline P3, and then enters an aerobic tank 2 for phosphorus removal treatment, and generated aerosol enters a baffled adsorption tank 4 for treatment. The working process of the electrobiological phosphorus oxidation tank 3 is approximately as follows, phosphine gas entering the electrobiological phosphorus oxidation tank 3 from the first air outlet 13 moves upwards to enter a reaction zone, is oxidized by electroactive microorganisms, is transferred from a gas phase to a liquid phase and is converted into phosphate, the treated gas is discharged from the third air outlet 34 at the top of the electrobiological phosphorus oxidation tank 3, and the liquid phase is discharged from the third water outlet 31 and enters the aerobic tank 2 through the second circulation pipeline P3 and the transfusion pipeline P1 for further treatment.
As a preferred solution of this embodiment, referring to fig. 1, a support plate 36 is disposed in the electrobiological phosphorus oxidation tank 3, the support plate 36 is located above the third water outlet 31, the biological filler 32 is supported by the support plate 36, and a plurality of air holes are uniformly formed in the support plate 36. The support plate 36 is used for supporting the biological filler 32, and the air guide holes formed on the support plate play a role in uniformly guiding air. The phosphine-containing gas discharged from the first exhaust port 13 is collected at the bottom of the electrobiological phosphorus oxidation tank 3, uniformly split by the supporting plate 36, and then enters the reaction zone. Further, the porous filler is polyurethane, and the polyurethane has the characteristics of large specific surface area and light weight, so that the weight of the filler can be reduced while more electroactive microorganisms are adsorbed, and the bearing capacity of the support plate 36 can be reduced.
The baffling type adsorption tank 4 is arranged above the aerobic tank 2, and the bottom of the baffling type adsorption tank is communicated with the inside of the aerobic tank 2 through a second exhaust port 24 and is used for treating the biological aerosol discharged from the aerobic tank 2. The baffle type adsorption tank 4 is provided with an adsorption packing 42 and a vertical baffle plate 43. The gas containing the biological aerosol enters the baffled adsorption tank 4 from the second exhaust port 24 at the top of the aerobic tank 2, passes through the adsorption filler 42 along a diversion path under the diversion effect of the vertical baffle plate 43, the biological aerosol is trapped in the adsorption filler 42, and the purified gas is discharged from the fourth exhaust port 41 at the top of the baffled adsorption tank 4. The vertical baffle 43 can prolong the residence time of the gas containing the biological aerosol in the reactor, so that the biological aerosol is fully contacted with the adsorption filling 42, and the interception effect is improved. As will be appreciated by those skilled in the art, the above-described vertical baffle 43 is located between the second exhaust port 24 and the second exhaust port 24. Preferably, one end of the vertical baffle plate 43 is connected with the top surface or the bottom surface of the baffle adsorption tank 4, a gap of 50-100 mm is reserved between the other end and the opposite side surface, and the horizontal distance between the two vertical baffle plates is 100-200 mm. The adsorption packing 42 is preferably activated carbon, ceramic particles, diatomaceous earth, quartz sand, or molecular sieves. The granularity of the activated carbon, the ceramsite, the diatomite or the quartz sand is preferably 2-20 mm. In this embodiment, molecular sieves are preferably used, which release a lot of heat during the adsorption of the bioaerosol, so that the bacteria adsorbed on the molecular sieves are deactivated. The analysis sieve is preferably a 4A molecular sieve or a 13X molecular sieve.
The gas membrane separation unit 5 positioned at the third layer is used for reprocessing the purified gas discharged from the baffled adsorption cell 4 so as to realize the recycling of oxygen. Specifically, the gas membrane separation unit 5 is located above the baffled adsorption tank 4, and the bottom of the gas membrane separation unit is communicated with the inside of the baffled adsorption tank 4 through the fourth exhaust port 41, so that multi-component gas separation is realized by using the gas separation membrane. The gas membrane separation technology is to separate by the adsorption capacity of each component in the gas on the surface of the polymer membrane and the difference in dissolution-diffusion in the membrane, namely, the difference in permeation rate under the drive of pressure. In general, all gases can permeate a polymer membrane, and the process is that gas molecules are firstly adsorbed and dissolved on the surface of the high-pressure side of the membrane, then are diffused in the membrane by means of concentration gradient, and finally are resolved from the low-pressure side of the membrane, and the structure is that the passing speed of small molecules and molecules with stronger polarity is higher, and the passing speed of large molecules and molecules with weaker polarity is lower. The membrane separation oxygen-making technology is to take air as raw material, let the air pass through the membrane under certain pressure condition, utilize different permeation rates of gases with different properties such as oxygen and nitrogen in the membrane to separate oxygen and nitrogen, its separation driving force is the partial pressure difference of the gases at both sides of the membrane, so the membrane gas separation has no phase change and does not need regeneration. The oxygen in the air permeates faster and preferentially permeates the membrane to be enriched, the other gases permeate slower and are more retained on the air side of the raw material to form permeation residual gas, and the oxygen continuously permeates the semi-permeable membrane to form oxygen-enriched air under the driving of pressure difference on the two sides of the membrane. Oxygen-enriched air is discharged from the oxygen-enriched outlet 51 into the aeration port 23, and the rest of the air is discharged from the fifth exhaust port 52 as aeration supplemental oxygen. The gas separation membrane module 53 may be a flat plate type membrane module, a spiral wound type membrane module, or a hollow fiber type membrane module. The membrane material of the gas separation membrane module 53 may be polysulfone, silicone rubber or polyphenylene oxide.
The overall workflow of the phosphorus-containing wastewater treatment system provided in this example is as follows:
wastewater treatment:
the phosphorus-containing wastewater enters the anaerobic tank 1 through the first water inlet 11 for anaerobic treatment, and is discharged from the first water outlet 12 after the treatment;
The sewage discharged from the first water outlet 12 reaches the second water inlet 21 of the aerobic tank 2 through the liquid delivery pipeline P1, enters the aerobic tank 2 for aerobic treatment, and the generated aerosol enters the bottom of the baffled adsorption tank 4 through the second air outlet 24. The sewage is discharged from the second water outlet 22 after being treated, most of the water is discharged through a liquid discharge pipeline, a small part of the water reaches a spray liquid inlet through a first circulating pipeline P2 and flows through a reaction area of the electrobiological phosphorus oxidation tank 3 from top to bottom as nutrient solution and conductive solution, and the liquid at the bottom of the electrobiological phosphorus oxidation tank 3 is discharged from a third water outlet 31 and enters a transfusion pipeline P1 through a second circulating pipeline P3.
And (3) treating phosphine waste gas:
waste generated by the anaerobic tank 1 enters the bottom of the electrobiological phosphorus oxidation tank 3 through the first exhaust port 13, contacts with electroactive microorganisms in the reaction zone in the upward movement process, is oxidized into liquid phosphorus by the electroactive microorganisms, and gas generated by the anaerobic tank 1 is purified and then is discharged from the third exhaust port 34 at the top of the electrobiological phosphorus oxidation tank 3.
Microbial aerosol treatment:
Aerosol generated by the aerobic tank 2 enters the baffling type adsorption tank 4 through the second exhaust port 24, passes through the adsorption filler 42 along a diversion path under the diversion effect of the vertical baffle plate 43, and is trapped in the adsorption filler 42, so that the purification of the microbial aerosol is realized.
The purified gas is discharged from the fourth exhaust port 41 at the top of the baffled adsorption tank 4, enters the gas membrane separation unit 5, is separated by the membrane component, is discharged from the oxygen-enriched outlet 51, is connected with the aeration port 23, is used as the supplementary oxygen for aeration, and is discharged from the fifth exhaust port 52.
From the above, the phosphorus-containing wastewater treatment system provided by the embodiment of the invention has the following advantages:
1. the phosphorus-containing wastewater treatment system is of a longitudinal three-layer structure, fully utilizes the space in the vertical direction and the upward movement characteristic of gas, simplifies the design of a gas pipeline, and reduces the duty area of equipment.
2. The electric biological phosphorus oxidation tank and the baffling adsorption tank are arranged above the biological phosphorus removal reaction unit in the treatment system and are respectively used for treating phosphine generated in the anaerobic treatment process and biological aerosol generated in the aerobic treatment process. Therefore, the phosphorus-containing wastewater treatment system can treat phosphine gas and biological aerosol which are generated simultaneously while biologically dephosphorizing phosphorus-containing wastewater, and is beneficial to eliminating potential safety hazards and protecting the atmospheric environment.
3. A part of liquid discharged from the aerobic tank of the treatment system is returned to the electrobiological phosphorus oxidation tank to be used as nutrient solution and conductive liquid of the electrobiological phosphorus oxidation tank. After the gas exhausted from the baffling adsorption tank is separated and treated by the gas membrane separation unit, the treatment system returns the oxygen-enriched air to the aerobic tank as supplementary aeration, so that the energy consumption can be saved. Thus, the treatment system also achieves reuse of oxygen resources and phosphorus resources.
The technical scheme of the invention is further described below with reference to specific examples:
The phosphorus-containing wastewater treatment system in the following embodiment has the same structure and comprises a biological phosphorus removal reaction unit, an electrobiological oxidation adsorption unit and a gas membrane separation unit 5 from bottom to top as shown in fig. 1. The biological dephosphorization reaction unit comprises an anaerobic tank 1 and an aerobic tank 2 which are arranged in parallel, and the anaerobic tank and the aerobic tank are separated by a partition plate. The anaerobic tank 1 comprises a first water inlet 11, a first water outlet 12, a first air outlet 13 and a first horizontal baffle plate 14, and the aerobic tank 2 comprises a second water inlet 21, a second water outlet 22, an aeration port 23, a second air outlet 24, a sludge discharge port 28, an aeration pipe 25, a second horizontal baffle plate 26 and a membrane assembly 27. The specific structure of the anaerobic tank 1 and the aerobic tank 2 is the same as that of the above embodiment, and the connection relationship between the two is the same as that of the above embodiment. The electrobiological oxidation adsorption unit comprises an electrobiological phosphorus oxidation tank 3 and a baffled adsorption tank 4 which are arranged in parallel, and the electrobiological phosphorus oxidation tank and the baffled adsorption tank are formed by separation of a partition plate. The electrobiological phosphorus oxidation tank 3 comprises a spray liquid inlet, a third water outlet 31, biological fillers 32, an electrode 33, a third air outlet 34, a spray pipe 35 and a supporting plate 36, and the baffled adsorption tank 4 comprises a fourth air outlet 41, adsorption fillers 42 and a vertical baffle plate 43. The specific structures of the electrobiological phosphorus oxidation tank 3 and the baffled adsorption tank 4 are the same as the above embodiments. The biologic filler 32 is a porous filler pre-inoculated with pseudomonas aeruginosa and bacillus. The connection and the positional relationship between the electrobiological phosphorus oxidation tank 3 and the anaerobic tank 1 and the aerobic tank 2, and the connection and the positional relationship between the baffled adsorption tank 4 and the aerobic tank 2 are the same as those of the above embodiment. The gas membrane separation unit 5 includes an oxygen-enriched outlet 51, a fifth gas outlet 52, and a gas separation membrane assembly 53, and has the same specific structure as the above-described embodiment. The positions and connection relations between the gas membrane separation unit 5 and the baffled adsorption tank 4 and the aerobic tank 2 are the same as those of the above embodiment.
Example 1
Anaerobic tank:
Size: the length, width and height are respectively 0.3m,0.6m and 0.5m
Hydraulic retention time of 10h
And (3) an aerobic tank:
Size: the length, width and height are respectively 0.9m,0.6m and 0.5m
Hydraulic retention time of 10h
Aeration rate of 30L/min
Membrane module:
the hollow fiber membrane component is made of polyethylene membrane.
An electrobiological phosphorus oxidation tank:
the dimensions are respectively 0.4m,0.6m and 0.3m in length, width and height
The porous filler is light porous polyurethane, and the anode and cathode electrode materials are carbon fibers.
Baffle type adsorption tank:
The dimensions are respectively 0.7m,0.6m and 0.15m in length, width and height
Adsorption packing 4A molecular sieve
Gas residence time of 2min
Gas membrane separation unit:
The dimensions are respectively 0.7m,0.6m and 0.15m in length, width and height
The gas separation membrane component is a spiral roll type membrane component, 3 groups are all made of polysulfone.
Film area 0.15m 2
The phosphorus-containing wastewater treatment system is adopted to treat phosphorus-containing wastewater, and the treatment results are as follows:
The initial concentration of phosphorus, phosphine and bacterial aerosol is 10.5mg/L,1.29mg/m 3,642CFU/m3, the concentration after treatment is 0.30mg/L,0.03mg/m 3,0CFU/m3, and the removal rate is 97.1%,97.7% and 100.0%. The concentration of the total phosphorus discharged is lower than the pollutant discharge standard of urban sewage treatment plants established by the country, and the concentration of the bioaerosol discharged is lower than the indoor air quality standard established by the country.
Example 2
Anaerobic tank:
The dimensions are 1.5m,3m and 1.6m of length, width and height respectively
Hydraulic retention time of 6h
And (3) an aerobic tank:
the dimensions are 4.5m,3m and 1.6m respectively in length, width and height
Hydraulic retention time of 6h
Aeration rate of 140L/min
Membrane module:
the tubular membrane component is made of polyethylene membrane.
An electrobiological phosphorus oxidation tank:
the dimensions are 3m,0.75m for length, width and height respectively
The porous filler is granular active carbon, and the anode and cathode electrode materials are carbon felts;
Baffle type adsorption tank:
The dimensions are 3m,0.8m for length, width and height respectively
Adsorption packing 4A molecular sieve
Gas residence time of 5min
Gas membrane separation unit:
The dimensions are 3m,0.8m for length, width and height respectively
Gas separation membrane module:
The membrane material of the coiled membrane component is silicon rubber.
The dimensions are 3m,0.8m for length, width and height respectively
Membrane area 3.5m 2
The phosphorus-containing wastewater treatment system is adopted to treat phosphorus-containing wastewater, and the treatment results are as follows:
The initial concentration of phosphorus, phosphine and bacterial aerosol is 18.6mg/L,1.05mg/m 3,1001CFU/m3, the concentration after treatment is 0.29mg/L,0.03mg/m 3,75CFU/m3, and the removal rate is 98.4%,97.1% and 92.5%. The concentration of the total phosphorus discharged is lower than the pollutant discharge standard of urban sewage treatment plants established by the country, and the concentration of the bioaerosol discharged is lower than the indoor air quality standard established by the country.
Example 3
Anaerobic tank:
size: the length, width and height are respectively 0.25m,0.5m and 0.6m
Hydraulic retention time of 8h
And (3) an aerobic tank:
Size: the length, width and height are respectively 0.75m,0.5m and 0.6m
Hydraulic retention time of 8h
Aeration rate is 90L/min
Membrane module:
The membrane material is polysulfone membrane.
An electrobiological phosphorus oxidation tank:
size: the length, width and height are respectively 0.4m,0.5m and 0.4m
The porous filler is light porous polyurethane, and the anode and cathode electrode materials are carbon rods;
Baffle type adsorption tank:
Size: the length, width and height are respectively 0.6m,0.5m and 0.3m
Adsorption filler 13X molecular sieve
Gas residence time of 1min
Gas membrane separation unit:
Size: the length, width and height are respectively 0.6m,0.5m and 0.1m
Gas separation membrane module:
The flat plate type membrane component is made of polysulfone.
Membrane area 0.2m 2
The phosphorus-containing wastewater treatment system is adopted to treat phosphorus-containing wastewater, and the treatment results are as follows:
The initial concentration of phosphorus, phosphine, bacterial aerosol and fungal aerosol is 17.1mg/L,2.04mg/m 3,530CFU/m3,284CFU/m3, the concentration after treatment is 0.9mg/L,0.04mg/m 3,4CFU/m3,6CFU/m3, and the removal rate is 94.7%,98.0%,99.2% and 97.9% respectively. The concentration of the total phosphorus discharged is lower than the pollutant discharge standard of urban sewage treatment plants established by the country, and the concentration of the bioaerosol discharged is lower than the indoor air quality standard established by the country.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A phosphorus-containing wastewater treatment system is characterized by comprising a biological phosphorus removal reaction unit, an electrobiological oxidation adsorption unit and a gas membrane separation unit from bottom to top in sequence,
The biological phosphorus removal reaction unit comprises an anaerobic tank and an aerobic tank which are arranged in parallel, wherein the anaerobic tank is provided with a first water inlet and a first water outlet, the aerobic tank is provided with a second water inlet, a second water outlet and an aeration port, the first water outlet is connected with the second water inlet through a transfusion pipeline, and a first circulating pump is arranged on the transfusion pipeline;
The electrobiological oxidation adsorption unit comprises an electrobiological phosphorus oxidation tank and a baffling adsorption tank which are arranged in parallel, wherein the electrobiological phosphorus oxidation tank is arranged above the anaerobic tank, and the bottom of the electrobiological phosphorus oxidation tank is communicated with the inside of the anaerobic tank through a first exhaust port;
The electric biological phosphorus oxidation tank is characterized in that a spray liquid inlet is arranged at the upper part of the electric biological phosphorus oxidation tank, a third water outlet is arranged at the lower part of the electric biological phosphorus oxidation tank, a reaction zone is arranged between the spray liquid inlet and the third water outlet, biological filler and an electrode are arranged in the reaction zone, the biological filler is porous filler which is pre-inoculated with an electric active strain, the electrode is externally connected with a power supply, the spray liquid inlet is connected with a first circulating pipeline, a second circulating pump is arranged on the first circulating pipeline, the third water outlet is connected with a transfusion pipeline through the second circulating pipeline, and a third exhaust port is arranged at the top of the electric biological phosphorus oxidation tank;
The baffle type adsorption tank is internally provided with adsorption filler and a vertical baffle plate, and the top of the baffle type adsorption tank is provided with a fourth exhaust port;
The gas membrane separation unit is positioned above the baffled adsorption tank, a gas separation membrane component is arranged in the gas membrane separation unit, the bottom of the gas membrane separation unit is communicated with the baffled adsorption Chi Naxiang through a fourth exhaust port, an oxygen-enriched outlet and a fifth exhaust port are arranged on the upper part of the gas membrane separation unit, the oxygen-enriched outlet is connected with an aeration port, and an air pump is arranged between the oxygen-enriched outlet and the aeration port.
2. The phosphorus-containing wastewater treatment system of claim 1, wherein the first water inlet is positioned below the first water outlet in the anaerobic tank, and wherein the anaerobic tank is provided with a first horizontal baffle between the first water inlet and the first water outlet.
3. The phosphorus-containing wastewater treatment system according to claim 1, wherein the second water outlet is positioned above the aeration opening, the aeration opening is positioned above the first water inlet, an aeration pipe, a second horizontal baffle plate and a membrane assembly are arranged in the aerobic tank, the aeration pipe is communicated with the aeration opening, the aeration pipe is arranged along the horizontal direction, a plurality of aeration holes are uniformly distributed on the surface, the second horizontal baffle plate is arranged between the aeration pipe and the second water inlet, the membrane assembly is arranged above the aeration pipe, the outlet of the membrane assembly forms the second water outlet, and a sludge discharge opening is further arranged at the bottom of the aerobic tank.
4. The phosphorus-containing wastewater treatment system of claim 3, wherein the membrane module is a hollow fiber membrane module or a roll-to-roll membrane module.
5. The phosphorus-containing wastewater treatment system according to claim 1, wherein a supporting plate is arranged in the electrobiological phosphorus oxidation tank and is positioned above the third water outlet, the biological filler is supported by the supporting plate, and a plurality of air guide holes are uniformly formed in the supporting plate.
6. The phosphorus-containing wastewater treatment system of claim 5, wherein said porous filler is polyurethane.
7. The phosphorus-containing wastewater treatment system according to claim 1, wherein the electrobiological phosphorus oxidation tank is internally provided with a spray pipe, the spray pipe is connected with a spray liquid inlet, and a plurality of groups of spray heads are uniformly arranged on the spray pipe along the horizontal direction.
8. The phosphorus-containing wastewater treatment system of claim 1, wherein the electroactive species is one or both of pseudomonas aeruginosa and bacillus.
9. The phosphorus-containing wastewater treatment system of claim 1, wherein the electrode is a graphite electrode, a carbon felt electrode, or a carbon fiber electrode, the electrodes being disposed in a horizontal direction.
10. The phosphorus-containing wastewater treatment system of claim 1, wherein in the baffled adsorption tank, the adsorption filler is activated carbon, ceramsite, diatomaceous earth, quartz sand or molecular sieve.
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