CN113354083A - Device and method for synchronously recycling struvite in anaerobic membrane biological sewage treatment - Google Patents
Device and method for synchronously recycling struvite in anaerobic membrane biological sewage treatment Download PDFInfo
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Abstract
The invention provides a device and a method for synchronously recycling struvite in anaerobic membrane biological sewage treatment. In the invention, under the condition of the existence of an electric field, the electrode reaction can improve the pH value of the solution, effectively inhibit acidification, stimulate microorganisms, accelerate the degradation speed of pollutants, increase the surface charge of sludge and relieve membrane pollution to a certain extent; on the other hand, the magnesium plate is used as the anode plate, so that the problem of low nitrogen and phosphorus removal rate of the anaerobic membrane bioreactor can be solved, and the anaerobic membrane bioreactor is converted into available resources of struvite for recycling.
Description
Technical Field
The invention belongs to the technical field of water treatment, relates to anaerobic membrane biological sewage treatment, and particularly relates to a device and a method for synchronously recycling struvite in anaerobic membrane biological sewage treatment.
Background
Since the last century, with the rapid growth of the world population and the rapid development of the industrialization level, the living standard of people is continuously improved, so that the treatment capacity and the treatment difficulty of industrial wastewater and domestic sewage are continuously improved, and the serious water pollution and the water resource shortage become one of the most serious problems facing China and even the world. In addition, the technical requirements for recovering resources and energy from wastewater and constructing a new carbon-neutral water treatment model are increasing day by day, and the synchronous recovery of resources and energy in the wastewater treatment process becomes an important content of sustainable development. Due to the large water pollution, the diversity of pollutant components and the continuous emergence of new pollutants, the development of new sewage treatment technologies is urgent.
As a new technology for coupling a membrane separation technology with an Anaerobic biological technology, an Anaerobic membrane bioreactor (AnMBR) has the advantages of low sludge yield, low capital investment, low energy consumption, small carbon footprint and the like, and has attracted extensive attention of researchers in the field of sewage treatment in recent years. However, the further development of the method is restricted due to the problems of serious membrane pollution, poor treatment effect of pollutants such as ammonia nitrogen, total phosphorus and the like.
CN109022491A discloses a fermentation coupling recycling process of poultry and livestock manure HYTHANE, which is characterized in that a first-stage anaerobic process screens and acclimates hydrolytic bacteria and acidifying bacteria through a fully-mixed anaerobic reactor and an anaerobic membrane bioreactor two-phase HYTHANE fermentation system, and hydrogen, organic acid and carbon dioxide are simultaneously generated. Acetic acid nutritional type and hydrogen nutritional type methanogens in the secondary fermentation can be sufficiently metabolized by substrates efficiently. And then, adopting anaerobic digestion liquid three-electrode electrolytic flow control to recover magnesium ammonium phosphate and struvite. Compared with the traditional anaerobic biogas production, the system has the advantages that the heat value of the hydrogen alkane gas generated by the system is high, and the energy recycling rate of the livestock manure resources is further improved. The same coupling technology carries out three-electrode electrolysis aiming at phosphorus and nitrogen enrichment in the digestive juice, sacrifices an anode ionized magnesium rod, generates high-efficiency agricultural fertilizer (struvite) and further degrades the digestive juice.
CN111484137A discloses a high concentration effluent disposal system and technology that adopts AnMBR membrane, including struvite sedimentation tank, hydrolysis acidification tank, anaerobism pond, AnMBR pond, high load denitrogenation pond, low-load denitrogenation pond and the denitrification denitrogenation pond that pending sewage flows through in proper order, characterized in that: further comprises Mg2+Adding device, alkalinity adding device, second water pump, third water pump and control device, Mg2+The adding device adds a magnesium source into the struvite sedimentation tank, a first AnMBR membrane and an air pump are arranged in the AnMBR tank, and a second AnMBR membrane is arranged in the denitrification tank. According to the treatment process of the high-concentration wastewater treatment system, the short-cut nitrification anaerobic ammonia oxidation system is used, so that aeration quantity, energy and carbon sources are saved, the recovery of phosphorus sources and carbon sources is realized, biogas generated in the AnMBR tank 4 is used for AnMBR membrane backwashing and the carbon sources in the denitrification denitrogenation tank 7, and the multi-stage cyclic utilization of energy is realized.
CN110526346B discloses an electrochemical anaerobic membrane biological sewage treatment device and a treatment method thereof, the device comprises a reaction tank, a sacrificial anode electrode, a non-sacrificial anode electrode and a membrane assembly cathode are arranged in the reaction tank, the electrochemical anaerobic membrane biological sewage treatment device further comprises a power supply device, the anode of the power supply device is respectively and independently electrically connected with the sacrificial anode electrode and the non-sacrificial anode electrode, and the cathode of the power supply device is electrically connected with the membrane assembly cathode. The invention combines electrochemistry with an anaerobic membrane bioreactor, removes pollutants in advance, increases sludge size and neutralizes surface charges of sludge through electric flocculation; the electric field static electricity repels pollutants, the hydrogen evolution reaction is carried out to improve the appearance of a filter cake layer, and the in-situ electric cleaning of the surface of the membrane is realized; the electric field stimulates the activity of the microorganism, improves the metabolic rate of the microorganism and promotes the yield of methane. The metal ions generated by the electric flocculation relieve the pH drop caused by acid production by microorganism metabolism.
Common anaerobic membrane bioreactor membrane fouling control strategies include membrane modification and membrane cleaning, however, the above methods are relatively uneconomical, and thus mitigating membrane fouling by AnMBR by optimizing reactor structure and membrane characteristics will become the main research direction of AnMBR. Research shows that the method can stimulate microorganisms in the presence of an electric field, improve the activity of the microorganisms, accelerate the degradation speed of pollutants, increase the surface charge of sludge, and reduce the compactness and stability of a sludge cake layer formed on the surface of a membrane, thereby relieving membrane pollution to a certain extent. In addition, in the nitrogen and phosphorus removal technology, struvite precipitation is considered as a promising technology, and struvite is a white crystal, is slightly soluble under neutral or alkaline conditions, has the characteristic of slowly releasing nitrogen and phosphorus nutrient elements in the struvite, can be used as a slow release fertilizer, but can be crystallized by externally adding a magnesium source due to the low magnesium content in wastewater. Therefore, an external anaerobic electrically-controlled membrane bioreactor needs to be built, and a magnesium anode is combined with the anaerobic membrane bioreactor to achieve the purposes of efficiently treating organic matters in high-concentration organic wastewater and simultaneously recovering nitrogen and phosphorus resources in the wastewater.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device and a method for synchronously recycling struvite in anaerobic membrane biological sewage treatment. In the invention, on one hand, under the condition of the existence of an electric field, the pH value of the solution can be improved through electrode reaction, the pH value of the solution is stabilized to about 7.3, the acidification effect is effectively inhibited, a good environment is provided for the methanogenesis process, the microorganism can be stimulated, the degradation speed of pollutants is accelerated, the surface charge of sludge can be increased, and the membrane pollution is relieved to a certain extent; on the other hand, the magnesium plate is used as the anode plate, so that the economic efficiency is high, magnesium ions can be continuously provided, the problem of low nitrogen and phosphorus removal rate of the anaerobic membrane bioreactor can be solved, and the anaerobic membrane bioreactor is converted into available resources of struvite for recycling.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device for synchronously recycling struvite in anaerobic membrane biological sewage treatment, which comprises an anaerobic bioreactor, a membrane module reactor and a power supply device, wherein the anaerobic bioreactor is connected with the membrane module reactor, the power supply device is electrically connected with the membrane module reactor, the membrane module reactor comprises a shell, an anode plate, a cathode plate and a membrane module are arranged in the shell, the anode plate and the cathode plate are distributed on two sides of the membrane module, and the anode plate is a magnesium plate.
In the invention, on one hand, under the condition of the existence of an electric field, the pH value of the solution can be improved through electrode reaction, the pH value of the solution is stabilized to about 7.3, the acidification effect is effectively inhibited, a good environment is provided for the methanogenesis process, the microorganism can be stimulated, the degradation speed of pollutants is accelerated, the surface charge of sludge can be increased, and the membrane pollution is relieved to a certain extent; on the other hand, the magnesium plate is used as the anode plate, so that the economic efficiency is high, magnesium ions can be continuously provided, the problem of low nitrogen and phosphorus removal rate of the anaerobic membrane bioreactor can be solved, and the anaerobic membrane bioreactor is converted into available resources of struvite for recycling.
As a preferable technical scheme of the invention, a pH probe is also arranged in the shell.
It should be noted that the present invention is not particularly limited to the structural features such as the size, shape, or material of the pH probe, and the pH probe is used to measure the pH value of the liquid, so it is understood that other pH probes capable of implementing such functions can be used in the present invention, and those skilled in the art can adapt the size, shape, or material of the pH probe according to the use scenario and the test conditions.
As a preferable technical scheme of the invention, the bottom of the anaerobic bioreactor is provided with a liquid inlet.
Preferably, a liquid outlet is arranged at the top of the anaerobic bioreactor.
Preferably, the liquid outlet is externally connected with a liquid outlet pipeline.
Preferably, the liquid outlet pipe is connected with the membrane module reactor.
Preferably, the anaerobic bioreactor is a full-mixing anaerobic bioreactor.
It should be noted that the present invention does not specifically require and specially limit the structural features of the liquid outlet pipe, such as size, shape, or material, and the liquid outlet pipe in the present invention functions to make the liquid of the anaerobic bioreactor flow into the membrane module reactor for reaction, so it can be understood that other liquid outlet pipes capable of achieving such functions can be used in the present invention, and those skilled in the art can adaptively adjust the size, shape, or material of the liquid outlet pipe according to the use scenario and test conditions.
As a preferable technical scheme, the bottom of the anaerobic bioreactor is provided with a return port, the return port is connected with the membrane component reactor through a return pipeline, and liquid in the membrane component reactor returns to the anaerobic bioreactor through the return pipeline.
Preferably, a peristaltic pump is arranged on the return pipeline.
It should be noted that the present invention does not specifically require and specially limit the size, shape, material, and other structural features of the return line, and the return line functions in the present invention to circulate the concentrated solution of the mixed solution after solid-liquid separation in the membrane module reactor to the anaerobic bioreactor, and to discharge water after filtration, so it can be understood that other return lines capable of achieving such functions can be used in the present invention, and those skilled in the art can adaptively adjust the size, shape, or material of the return line according to the use scenario and test conditions.
It should be noted that the present invention does not specifically require and limit the structural features of the peristaltic pump, such as size, shape, or material, and the peristaltic pump functions to circulate liquid in the present invention, so it is understood that other peristaltic pumps capable of achieving such functions may be used in the present invention, and those skilled in the art may adaptively adjust the size, shape, or material of the peristaltic pump according to the use scenario and the test conditions.
As a preferable technical scheme of the invention, a mechanical stirring device is arranged in the anaerobic bioreactor, and a magnetic stirring device is arranged in the membrane component reactor.
Preferably, the rotation speed of the mechanical stirring device is 100-200 rpm, for example, 100rpm, 110rpm, 120rpm, 130rpm, 140rpm, 150rpm, 160rpm, 170rpm, 180rpm, 190rpm, 200rpm, but is not limited to the enumerated values, and other values not enumerated within the range of the enumerated values are also applicable.
Preferably, the rotation speed of the magnetic stirring device is 100 to 200rpm, for example, 100rpm, 110rpm, 120rpm, 130rpm, 140rpm, 150rpm, 160rpm, 170rpm, 180rpm, 190rpm, 200rpm, but is not limited to the enumerated values, and other values not enumerated within the range of the enumerated values are also applicable.
It should be noted that the present invention does not specifically require and specially limit the size, shape, or material of the mechanical stirring device and the magnetic stirring device, and the mechanical stirring device and the magnetic stirring device in the present invention are used to stir and mix the liquid uniformly, so it can be understood that other mechanical stirring devices and magnetic stirring devices capable of achieving such functions can be used in the present invention, and those skilled in the art can adaptively adjust the size, shape, or material of the mechanical stirring device and the magnetic stirring device according to the use scenario and the test condition.
As a preferable technical scheme of the invention, the cathode plate is an inert electrode.
Preferably, the inert electrode is graphite.
As a preferable technical scheme of the invention, the membrane module is a hollow fiber filter membrane.
Preferably, the membrane material adopted by the hollow fiber filter membrane is PVDF.
Preferably, the outlet end of the hollow fiber filter membrane is connected with a drainage pipeline.
Preferably, a peristaltic pump is arranged on the water discharge pipeline.
As a preferable technical solution of the present invention, the power supply device is a dc power supply.
In a second aspect, a method for synchronously recycling struvite in anaerobic membrane biological sewage treatment, which uses the device for synchronously recycling struvite in anaerobic membrane biological sewage treatment according to the first aspect to treat sewage, comprises:
and (3) introducing the sewage to be treated into a full-mixing anaerobic bioreactor, starting a power supply device, and starting an anode plate and a cathode plate of the membrane component reactor to work to generate an electrodeposition reaction to generate struvite.
As a preferred technical solution of the present invention, the method specifically comprises the following steps:
introducing sewage to be treated into a full-mixing anaerobic bioreactor, starting a power supply device, and adjusting voltage;
preferably, the voltage in step (i) is 0.6V;
and (II) generating magnesium ions by an anode plate of the membrane component reactor, generating hydrogen evolution reaction by a cathode plate, and precipitating the magnesium ions by participating in the reaction with ammonium ions and phosphate ions in the sewage to generate struvite.
Illustratively, the invention provides a specific implementation process with strong operability, which comprises the following steps:
in the invention, sewage to be treated is introduced into a full-mixing anaerobic bioreactor, a DC power supply provides 0.6V voltage, and an anode plate generates Mg2+The hydrogen evolution reaction of the cathode plate occurs, and Mg is generated when the anode plate generates2+With NH in the feed liquid4 +、HnPO4 n-3The ion concentration product of (a) is greater than the solubility product constant of struvite (Ksp: 7.58X 10)-14～4.36×10-13) Spontaneous precipitation can be realized, struvite is generated, and the removal rate of nitrogen and phosphorus is improved. Researches show that the pH value of struvite sediment is 7.5-9.3, the optimal pH value is about 8.5, the pH value near the negative plate is increased due to electrode reaction of the negative plate, an environment beneficial to struvite sediment is formed, and Mg generated by the positive plate2+And the struvite can also migrate to the position near the cathode plate, so a large amount of struvite can be separated out on the surface of the cathode plate, and the recovery of the struvite by replacing the electrode plate is facilitated.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, on one hand, under the condition of the existence of an electric field, the pH value of the solution can be improved through electrode reaction, the pH value of the solution is stabilized to about 7.3, the acidification effect is effectively inhibited, a good environment is provided for the methanogenesis process, the microorganism can be stimulated, the degradation speed of pollutants is accelerated, the surface charge of sludge can be increased, and the membrane pollution is relieved to a certain extent; on the other hand, the magnesium plate is used as the anode plate, so that the economic efficiency is high, magnesium ions can be continuously provided, the problem of low nitrogen and phosphorus removal rate of the anaerobic membrane bioreactor can be solved, and the anaerobic membrane bioreactor is converted into available resources of struvite for recycling.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for synchronously recovering struvite in anaerobic membrane biological sewage treatment according to an embodiment of the present invention;
wherein, 1-an anaerobic bioreactor; 2-a membrane module reactor; 3-a power supply device; 4-magnesium board; 5-a cathode plate; 6-hollow fiber filter membrane; 7-liquid inlet; 8-a return line; 9-a liquid outlet pipeline; 10-a drain line; 11-mechanical stirring device.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It should be understood by those skilled in the art that the present invention necessarily includes necessary piping, conventional valves and general pump equipment for achieving the complete process, but the above contents do not belong to the main inventive points of the present invention, and those skilled in the art can select the layout of the additional equipment based on the process flow and the equipment structure, and the present invention is not particularly limited to this.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In one embodiment, the present invention provides an apparatus for synchronously recycling struvite during anaerobic membrane biological sewage treatment, which is shown in fig. 1 and includes an anaerobic bioreactor 1, a membrane module reactor 2 and a power supply device 3, wherein the anaerobic bioreactor 1 is connected to the membrane module reactor 2, the power supply device 3 is electrically connected to the membrane module reactor 2, the membrane module reactor 2 includes a housing, further, the housing includes an anode plate, a cathode plate 5, a membrane module and a pH probe, the anode plate and the cathode plate 5 are distributed on two sides of the membrane module, specifically, the anode plate is a magnesium plate 4.
The anaerobic bioreactor 1 is a full-mixing anaerobic bioreactor, a liquid inlet 7 is arranged at the bottom of the anaerobic bioreactor 1, a liquid outlet is arranged at the top of the anaerobic bioreactor, further, the liquid outlet is externally connected with a liquid outlet pipeline 9, and the liquid outlet pipeline 9 is connected with the membrane module reactor 2. The size, shape, material and other structural characteristics of the liquid outlet pipe 9 are not specifically required or limited, and the liquid outlet pipe 9 in the present invention functions to make the liquid in the anaerobic bioreactor 1 flow into the membrane module reactor 2 for reaction, so it can be understood that other liquid outlet pipes 9 capable of realizing such functions can be used in the present invention, and those skilled in the art can adaptively adjust the size, shape or material of the liquid outlet pipe 9 according to the use scene and test conditions.
The bottom of the anaerobic bioreactor 1 is provided with a return port which is externally connected with a return pipeline 8, the invention does not have specific requirements and special limitations on the structural characteristics such as the size, the shape or the material of the return pipeline 8, and the return pipeline 8 has the function of enabling the concentrated solution after solid-liquid separation in the membrane module reactor 2 to flow into the anaerobic bioreactor 1 for reaction again, so that other return pipelines 8 capable of realizing the functions can be used in the invention, and technicians in the field can adaptively adjust the size, the shape or the material of the return pipeline 8 according to use scenes and test conditions.
The outlet end of the return pipeline 8 is connected with the membrane component reactor 2, and the return pipeline is provided with a peristaltic pump. The invention does not make specific requirements and special limitations on the structural characteristics of the peristaltic pump, such as size, shape or material, and the like, and the peristaltic pump plays a role in circulating liquid, so that it can be understood that other peristaltic pumps capable of realizing such functions can be used in the invention, and a person skilled in the art can adaptively adjust the size, shape or material of the peristaltic pump according to the use scene and test conditions.
A mechanical stirring device 11 is arranged in the anaerobic bioreactor 1, the rotating speed of the mechanical stirring device 11 is 100-200 rpm, a magnetic stirring device is arranged in the membrane component reactor 2, and the rotating speed of the magnetic stirring device is 100-200 rpm. The present invention does not specifically require and specially limit the structural features of the mechanical stirring device 11 and the magnetic stirring device, such as size, shape, or material, and the mechanical stirring device 11 and the magnetic stirring device are used to stir the liquid uniformly, so it can be understood that other mechanical stirring devices 11 and magnetic stirring devices capable of realizing such functions can be used in the present invention, and those skilled in the art can adaptively adjust the size, shape, or material of the mechanical stirring device 11 and the magnetic stirring device according to the use scenario and the test conditions.
The cathode plate 5 is an inert electrode, specifically, the inert electrode is graphite, the membrane component is a hollow fiber filter membrane 6, further, the membrane material adopted by the hollow fiber filter membrane 6 is PVDF, the outlet end of the hollow fiber filter membrane 6 is connected with a drainage pipeline 10, a peristaltic pump is arranged on the drainage pipeline 10, and the power supply device 3 is a direct current power supply.
In another embodiment, the present invention provides a method for simultaneous struvite recovery in anaerobic membrane biological wastewater treatment, comprising:
the method specifically comprises the following steps:
introducing sewage to be treated into a full-mixed anaerobic bioreactor, starting a power supply device 3, and adjusting the voltage to 0.6V;
(II) generating magnesium ions by an anode plate of the membrane component reactor 2, generating hydrogen evolution reaction by a cathode plate 5, and precipitating the magnesium ions by participating in the reaction with ammonium ions and phosphate ions in the sewage to generate struvite.
Specifically, the present embodiment provides the following examples:
introducing the sewage to be treated into a full-mixing anaerobic bioreactor, providing 0.6V voltage by a direct current power supply, and generating Mg by an anode plate2+The cathode plate 5 generates hydrogen evolution reaction, and Mg generated by the anode plate2+With NH in the feed liquid4 +、HnPO4 n-3The ion concentration product of (a) is greater than the solubility product constant of struvite (Ksp: 7.58X 10)-14～4.36×10-13) Spontaneous precipitation can be realized, struvite is generated, and the removal rate of nitrogen and phosphorus is improved. Researches show that the pH value of struvite sediment is 7.5-9.3, the optimal pH value is about 8.5, the pH value near the cathode plate 5 is increased due to electrode reaction of the cathode plate 5, an environment beneficial to struvite sediment is formed, and Mg generated by the anode plate2+And the struvite can also migrate to the position near the cathode plate 5, so a large amount of struvite can be separated out on the surface of the cathode plate 5, and the recovery of the struvite by replacing the electrode plate is facilitated.
The application example provides a method for synchronously recycling struvite in anaerobic membrane biological sewage treatment, which comprises the following steps:
the parameters of the sewage to be treated are as follows:
COD is 2500-3000 mg/L;
ammonia nitrogen is 100 mg/L;
the phosphate was 80 mg/L.
Introducing sewage to be treated into a full-mixing anaerobic bioreactor, starting a power supply device 3 when the rotating speed of a mechanical stirring device 11 is 100rpm and the rotating speed of a magnetic stirring device is 100rpm, and providing 0.6V voltage by a direct-current power supply;
(II) the magnesium plate 4 generates electro-deposition reaction under the action of the direct current power supply provided by the power supply device 3, and the anode plate generates Mg2+The cathode plate 5 generates hydrogen evolution reaction, and Mg generated by the anode plate2+With NH in the feed liquid4 +、HnPO4 n-3The ion concentration product of (a) is greater than the solubility product constant of struvite (Ksp: 7.58X 10)-14～4.36×10-13) Spontaneous precipitation can be realized, struvite is generated, and the removal rate of nitrogen and phosphorus is improved. Researches show that the pH value of struvite sediment is 7.5-9.3, the optimal pH value is about 8.5, the pH value near the cathode plate 5 is increased due to electrode reaction of the cathode plate 5, an environment beneficial to struvite sediment is formed, and Mg generated by the anode plate2+And the struvite can also migrate to the position near the cathode plate 5, so a large amount of struvite can be separated out on the surface of the cathode plate 5, and the recovery of the struvite by replacing the electrode plate is facilitated.
The effluent condition of the sewage treated by the device for synchronously recovering the struvite through anaerobic membrane biological sewage treatment is evaluated as follows:
the COD removal rate is 98 percent;
the ammonia nitrogen removal rate is 40%;
the phosphate removal was 60%.
In the invention, on one hand, under the condition of the existence of an electric field, the pH value of the solution can be increased through electrode reaction, the pH value of the solution is stabilized at about 7.3, the occurrence of acidification is effectively inhibited, the activity of microorganisms can be enhanced, the growth and metabolism of the microorganisms are promoted, the domestication period is shortened, the surface charge of sludge in sewage is increased, the physicochemical property of the sludge is improved, the compactness and the stability of a sludge cake layer formed on the surface of a membrane are damaged, and the membrane pollution is relieved to a certain extent. The gas generated by electrolysis at the cathode plate 5 can also have a cleaning effect on the surface of the membrane module reactor 2.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The device for synchronously recycling struvite in anaerobic membrane biological sewage treatment is characterized by comprising an anaerobic bioreactor, a membrane component reactor and a power supply device, wherein the anaerobic bioreactor is connected with the membrane component reactor;
the membrane module reactor comprises a shell, wherein an anode plate, a cathode plate and a membrane module are arranged in the shell, the anode plate and the cathode plate are distributed on two sides of the membrane module, and the anode plate is a magnesium plate.
2. The device of claim 1, wherein a pH probe is further disposed within the housing.
3. The device according to claim 1 or 2, wherein the bottom of the anaerobic bioreactor is provided with a liquid inlet;
preferably, a liquid outlet is arranged at the top of the anaerobic bioreactor;
preferably, the liquid outlet is externally connected with a liquid outlet pipeline;
preferably, the liquid outlet pipeline is connected with the membrane module reactor;
preferably, the anaerobic bioreactor is a full-mixing anaerobic bioreactor.
4. The device according to any one of claims 1 to 3, wherein a return port is arranged at the bottom of the anaerobic bioreactor, the return port is connected with the membrane component reactor through a return pipeline, and liquid in the membrane component reactor returns to the anaerobic bioreactor through the return pipeline;
preferably, a peristaltic pump is arranged on the return pipeline.
5. The apparatus according to any one of claims 1 to 4, wherein a mechanical stirring device is arranged in the anaerobic bioreactor, and a magnetic stirring device is arranged in the membrane assembly reactor;
preferably, the rotating speed of the mechanical stirring device and the rotating speed of the magnetic stirring device are both 100-200 rpm.
6. An apparatus according to any one of claims 1 to 5 wherein the cathode plate is an inert electrode;
preferably, the inert electrode is graphite.
7. The apparatus according to any one of claims 1 to 6, wherein the membrane module is a hollow fiber filter membrane;
preferably, the membrane material adopted by the hollow fiber filter membrane is PVDF;
preferably, the outlet end of the hollow fiber filter membrane is connected with a drainage pipeline;
preferably, a peristaltic pump is arranged on the water discharge pipeline.
8. The device according to any one of claims 1-7, wherein said power supply means is a dc power supply.
9. A method for synchronously recycling struvite in anaerobic membrane biological sewage treatment, which is characterized in that sewage is treated by adopting the device for synchronously recycling struvite in anaerobic membrane biological sewage treatment of any one of claims 1 to 8, and the method comprises the following steps:
and (3) introducing the sewage to be treated into a full-mixing anaerobic bioreactor, starting a power supply device, and starting an anode plate and a cathode plate of the membrane component reactor to work to generate an electrodeposition reaction to generate struvite.
10. The method according to claim 9, characterized in that it comprises in particular the steps of:
introducing sewage to be treated into a full-mixing anaerobic bioreactor, starting a power supply device, and adjusting voltage;
preferably, the voltage in step (i) is 0.6V;
and (II) generating magnesium ions by an anode plate of the membrane component reactor, generating hydrogen evolution reaction by a cathode plate, and precipitating the magnesium ions by participating in the reaction with ammonium ions and phosphate ions in the sewage to generate struvite.
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