ECOF four-micro-organism membrane small sewage treatment device

Abstract

The application relates to the technical field of sewage treatment, and particularly discloses an ECOF four-micro-organism membrane small sewage treatment device, which comprises, in sequence, an electrolytic cell, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, an electric flocculation tank and a filter membrane tank; an iron electrode is arranged in the electrolytic cell, and a direct-current voltage is loaded on the iron electrode; the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank form an A 2 / O treatment unit, an A 2 / O treatment unit is internally provided with a reflux system and an aeration system. The electrolysis breaks the bonds of macromolecular organic matters in sewage, breaks the walls of the macromolecular organic matters and performs physical and chemical treatment, so that the macromolecular organic matters are electrolyzed into small-molecule organic matters and inorganic matters; the small-molecule organic matters float upwards into a next biochemical treatment step, provide a carbon source for subsequent biochemical treatment, and thus improve the efficiency of biochemical treatment in the A 2 / O treatment unit; the inorganic matters sink to form sludge, and the purpose of phosphorus removal of the sewage is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, and particularly to an ECOF four-micro-organism membrane small sewage treatment device. BACKGROUND

[0002] Sewage treatment is a process for purifying sewage to meet the water quality requirements for discharging to a certain water body or reusing. Sewage is divided into production sewage and domestic sewage according to its source. Production sewage includes industrial sewage, agricultural sewage, medical sewage and the like; and domestic sewage is the sewage generated in daily life, which is a complex mixture of various forms of inorganic and organic substances.

[0003] In the sewage treatment procedure, the wastewater treatment system can be divided into primary treatment, secondary treatment and tertiary deep treatment according to the different treatment degrees. The primary treatment mainly removes the suspended solids in the wastewater, the secondary treatment most commonly uses the biological treatment method to remove the organic substances in the wastewater in colloidal and dissolved states by a large margin, and the tertiary deep treatment further removes the pollutants that cannot be removed by the secondary treatment, such as phosphorus, nitrogen, biologically difficult-to-degrade organic pollutants, inorganic pollutants and pathogens. For domestic sewage, it is necessary to perform the tertiary treatment according to the above treatment degrees because it contains a large amount of phosphorus, nitrogen and organic pollutants. At present, cities are the main source of domestic sewage, and the treatment of urban domestic sewage is the most important in the current and future urban water-saving and urban water environment protection work, so the construction of domestic sewage treatment facilities is one of the necessary infrastructures of a city, and the urban domestic sewage treatment facilities have been relatively perfect.

[0004] However, it is obviously unrealistic to establish a large sewage treatment plant or directly access to the urban domestic sewage treatment plant for some remote workstations, supporting facilities and some scattered work points, such as highway service areas, toll stations, scenic spots, stations and wharfs. Therefore, it is necessary to provide an efficient and small domestic sewage treatment equipment for the scattered small places such as highway service areas and toll stations.A 2 The A / O method of denitrification and phosphorus removal process, i.e. the anaerobic-anoxic-aerobic sewage treatment process, is a commonly used secondary sewage treatment process, which is widely used for denitrification and phosphorus removal. It is mainly composed of an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank. The anaerobic tank is mainly used for releasing phosphorus and ammoniating part of the organic substances; the anoxic tank is mainly used for denitrification, i.e. denitrification; and the aerobic tank is used for removing COD and nitrification. However, the current A 2 The anaerobic, anoxic and aerobic processes of the A / O method of denitrification and phosphorus removal process need to reach a certain treatment time to meet the effluent requirements; secondly, the macromolecular organic substances in the sewage are difficult to degrade, and the A 2The degradation of macromolecular organic matters by the / O method for denitrification and phosphorus removal will prolong the treatment time, and the prolongation of the treatment time will inevitably result in the increase of the land area occupied by the sewage treatment equipment, and this does not meet the demand for the treatment efficiency and the miniaturization of the treatment equipment of the sewage treatment of the above-mentioned dispersed small sites.

[0005] Therefore, the company intends to integrate the electrolytic treatment method, the biochemical treatment method, the flocculation treatment method and the membrane filtration treatment method to form a short-range sewage treatment technology by combining various sewage treatment technologies, so as to improve the sewage treatment efficiency and put forward a miniaturized sewage treatment equipment suitable for dispersed small sites. SUMMARY

[0006] The purpose of the present application is to provide an ECOF four-micromolecule membrane miniaturized sewage treatment device, which can integrate various sewage treatment technologies and be suitable for dispersed small sites.

[0007] The electrolytic cell, the anaerobic tank, the anoxic tank, the aerobic tank, the sedimentation tank, the electric flocculation tank and the filter membrane tank are sequentially arranged.

[0008] The iron electrode is arranged in the electrolytic cell, and a direct current voltage of 12-36V is loaded at both ends of the iron electrode, the electrolytic current is controlled to be 3-40A, and the sewage enters the electrolytic cell through the pipeline and then overflows to the anaerobic tank after electrolysis.

[0009] The anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank form an A 2 / O treatment unit, and the sewage can perform A 2 / O method denitrification and phosphorus removal process in the A 2 / O treatment unit.

[0010] The A 2 / O treatment unit further comprises a reflux system and an aeration system, the reflux system can pump the sediment at the bottom of the aerobic tank and / or the sedimentation tank into the anaerobic tank and / or the anoxic tank through the reflux pump, the reflux pipes connected with the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank can be independently controlled, and the aeration system comprises aeration discs arranged at the bottom of the anaerobic tank, the anoxic tank and the aerobic tank and can be independently controlled.

[0011] The supernatant of the sedimentation tank overflows to the electric flocculation tank, the aluminum electrode is arranged in the electric flocculation tank, and the supernatant of the electric flocculation tank overflows to the filter membrane tank.

[0012] The stainless steel fine filter assembly is arranged in the filter membrane tank, the inner layer of the stainless steel fine filter assembly is connected with the clean water discharge pipe, and the clean water filtered through the stainless steel fine filter assembly is discharged through the clean water discharge pipe.

[0013] Beneficial effects:

[0014] (1) First, the ferroelectric electrode is used to electrolyze the sewage, and the electrolysis breaks the bonds of macromolecular organic matter in the sewage, breaks the wall and performs physical and chemical treatment, so as to electrolyze the macromolecular organic matter into small molecular organic matter and inorganic matter; the small molecular organic matter floats up into the next biochemical treatment step, providing a carbon source for the subsequent biochemical treatment, thereby improving the efficiency of the subsequent A 2 / O processing unit.

[0015] (2) During the electrolysis process, the iron ions released by the iron electrode combine with the chlorine ions in the sewage to form iron salts, which play a flocculating role to make the inorganic matter generated by electrolysis gather and accelerate its sinking to the bottom to form sludge, and the sludge is discharged to achieve the purpose of phosphorus removal from sewage.

[0016] (3) During the electrolysis process, the electrode will generate heat, which has a heating effect on the water body; during the biochemical treatment stage, the biochemical microorganisms will be in a dormant state when the temperature is lower than 15℃, and the biochemical microorganisms have the highest activity when the temperature reaches about 25℃, therefore, the heat generated by electrolysis can also improve the efficiency of the biochemical treatment stage of sewage.

[0017] (4) In the above basic scheme, the sewage can continuously enter the electrolytic cell through the pipeline, and the treated clear water can continuously be discharged through the clear water discharge pipe, that is, the sewage and clear water can be discharged simultaneously, and the sewage can be treated during the continuous water inlet and outlet process, so that the sewage can be treated more efficiently.

[0018] (5) In the above basic scheme, a reflux system is provided between the aerobic tank, the sedimentation tank and the anaerobic tank, and the reflux pipe can be independently controlled; in addition, the aeration discs at the bottom of the anaerobic tank, the anoxic tank and the aerobic tank can also be independently controlled.

[0019] Microbial carriers are added to the anaerobic tank, the anoxic tank and the aerobic tank, and the microbial carriers have a porous structure for microbial attachment and reproduction. When the concentration of nitrogen, phosphorus and COD in the sewage is low, the aeration disc in the anaerobic tank and the anoxic tank is closed, and the anaerobic tank, the anoxic tank and the sedimentation tank perform anaerobic reaction, and the aeration disc in the aerobic tank is completely opened to perform aerobic reaction; that is, the sewage treatment mode is AO mode, which can achieve the purpose of sewage treatment while saving energy consumption.

[0020] If the concentrations of nitrogen, phosphorus and COD in the sewage are at a medium level, the sewage in the sedimentation tank is returned to the anaerobic tank, and the aeration plate in the anaerobic tank is slightly opened to form a micro-aeration state, so as to perform the AA0 mode; the aeration plate at the bottom of the anaerobic tank is closed to perform anaerobic treatment on the sewage to release phosphorus and ammonify part of the organic matter; the aeration plate in the anoxic tank is adjusted to make the anoxic tank in a micro-oxygen state to perform denitrification treatment; and the aeration plate in the aerobic tank is fully opened to provide sufficient oxygen for aerobic reaction to consume the organic matter in the sewage and perform nitrification. Secondly, the control is conducted to make the return pipe connected with the sedimentation tank and the anoxic tank conductive, so that the return pump returns the sediment at the bottom of the sedimentation tank to the anoxic tank to fully perform nitrification and denitrification treatment on the sewage to fully decompose the organic matter.

[0021] If the concentrations of nitrogen, phosphorus and COD in the sewage are high, the anaerobic reaction is mainly performed in the sedimentation tank, the aeration plate in the anaerobic tank is slightly opened to form a micro-aeration state, and the aeration plate in the anoxic tank is fully opened to form an aerobic reaction state, that is, the anoxic tank and the aerobic tank both perform aerobic reaction, and the sewage in the sedimentation tank and the aerobic tank is returned to the anaerobic tank. The state is still the AA0 mode, but in this state, the aerobic reaction has a larger reaction space, so that the removal capacity of the organic matter, nitrogen and phosphorus is enhanced.

[0022] If the concentrations of nitrogen, phosphorus and COD in the sewage are super high, the anaerobic reaction can still be performed in the sedimentation tank, the aeration plate in the anaerobic tank is fully opened to perform aerobic reaction, and the aeration plate in the anoxic tank is slightly opened to perform anoxic reaction; and the sewage in the sedimentation tank and the aerobic tank is returned to the anaerobic tank and the aerobic tank. The state is the AOAO mode, which still has a larger aerobic reaction space and disperses different reaction spaces, which helps to improve the removal efficiency of the organic matter, nitrogen and phosphorus.

[0023] As can be seen from the above, by controlling the aeration amount in the anaerobic tank, the anoxic tank and the aerobic tank and the return range of the sewage, the microbial reaction kinetics balance can be manipulated, the organic load, the nitrogen and phosphorus load and the DO value in the reactor can be controlled, the activity of aerobic bacteria and anaerobic bacteria can be adjusted according to the state of the sewage, and the problems of nitrogen and phosphorus removal in sewage treatment are solved.

[0024] The preferred scheme one is that, as a further optimization of the basic scheme, the aerobic tank and the sedimentation tank are separated by a partition plate, the lower end of the partition plate is provided with an inclined plate inclined to the sedimentation tank, and the lower edge of the inclined plate and the side wall of the sedimentation tank form a communication port communicating the sedimentation tank and the aerobic tank.

[0025] In the state of aeration in the aerobic tank 14, the water body in the sedimentation tank 15 is in a static state, so that the dust and particulate matter in the water body sink downward to form sludge, the sludge slides into the aerobic tank 14 under the guide action of the inclined plate, and flows with the water body again under the influence of aeration to perform biochemical reaction, so that the sludge can continuously perform anaerobic, anoxic and aerobic reactions on the biological carrier.

[0026] Preferred solution two: as a further optimization of the basic solution, the aerobic tank is provided with a nitric acid online sensor, and the backflow pipes connected with the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank are provided with electromagnetic valves, and the pipelines connected with the aeration discs provided at the bottom of the anaerobic tank, the anoxic tank and the aerobic tank are provided with electromagnetic throttle valves; the nitric acid online sensor is connected with the control signal input end of the controller, and the electromagnetic valves and the electromagnetic throttle valves are connected with the execution signal output end of the controller.

[0027] The nitrogen content of the sewage in the aerobic tank is detected by the nitric acid online sensor, and the controller controls the sewage backflow range and the aeration amount through the sensor feedback value, so as to adjust the A 2 O, AO and AOAO, etc. Dynamic conversion of different treatment methods, so that the sewage is in the best treatment efficiency while ensuring the quality of sewage treatment.

[0028] Preferred solution three: as a further optimization of the basic solution, it also includes a clean water tank, a clean water discharge pipe is connected with the clean water tank, the clean water tank is connected with a drain pipe for drainage, and an ultraviolet disinfection device is arranged between the drain pipe and the clean water tank.

[0029] Chemical disinfection has complex procedures such as procurement, storage, transportation and addition; chlorine dioxide generator produces hydrogen gas during operation, which has the risk of explosion, and without the operation of full-time personnel, it is inconvenient for long-term storage. Ultraviolet disinfection equipment is arranged on the drain pipe, and ultraviolet rays can kill the sewage in all directions, and the implementation process of ultraviolet rays is simple.

[0030] Preferred solution four: as a further optimization of the basic solution, the clean water discharge pipe is connected with a backwashing pump through a bypass pipe, and a stop valve is arranged on the clean water discharge pipe in parallel with the backwashing pump.

[0031] With the continuous treatment of sewage, the particles attached to the stainless steel fine filter assembly will reduce the filtration efficiency, resulting in a decrease in the amount of effluent per unit time; in this case, the stop valve on the clean water discharge pipe is closed, and the backwashing pump is started, which pumps the clean water in the clean water tank into the inner layer of the stainless steel fine filter assembly and then discharges it through the filter hole, so as to remove the attached substances on the stainless steel fine filter assembly.

[0032] Preferred solution five: as a further optimization of preferred solution four, it also includes a blowdown system, the blowdown system includes a blowdown main pipe and blowdown branch pipes communicated with the blowdown main pipe, the blowdown branch pipes are respectively communicated with the bottom of the electric flocculation tank and the filter membrane tank, and stop valves are arranged on the blowdown branch pipes.

[0033] With the continuous treatment of sewage, the sediment at the bottom of the electric flocculation tank and the filter membrane tank gradually increases; by opening the stop valve on the blowdown branch pipe, the sediment at the bottom of the corresponding electric flocculation tank or filter membrane tank can be removed correspondingly.

[0034] Preferred solution six: As a further optimization of the preferred solution five, the bottom of the electrolytic cell and the filter membrane cell is set as a funnel shape. In order to facilitate the sediment to accumulate at the bottom and facilitate the sediment to be discharged.

[0035] Preferred solution seven: As a further optimization of the preferred solution six, the aeration system comprises at least two air pumps which can work alternately. Long time continuous operation of the air pump will generate a large amount of heat, thereby increasing the risk of air pump failure; therefore, the use of multiple air pumps working alternately can prolong the service life of the air pump, reduce the probability of air pump failure, and ensure the continuous operation of the sewage treatment device.

[0036] Preferred solution eight: As a further optimization of the preferred solution seven, the upper part of the electrolytic cell and the electric flocculation cell is provided with a scum discharge structure, the scum discharge structure comprises a funnel-shaped flow guide groove below the liquid surface and a scum discharge pipe connected to the bottom of the flow guide groove and extending to the outside, and the distance between the top of the flow guide groove and the liquid surface is 3-5mm.

[0037] Because the impurity composition in sewage is complex, a large amount of scum will be generated in the electrolysis and electric flocculation process. The flow guide groove of the scum discharge mechanism is slightly lower than the liquid surface. Under the action of water tension, water will not flow into the flow guide groove in a large amount at a moment, but will flow slowly along the side wall of the flow guide groove, thereby removing the scum under the action of water flow.

[0038] Preferred solution nine: As a further optimization of the preferred solution eight, the electrolytic cell, anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, electric flocculation cell, filter membrane cell and clear water tank are integrated in the same cubic structure, the cubic structure is divided into front side area and rear side area, the electrolytic cell, anaerobic tank, anoxic tank, aerobic tank and clear water tank are arranged in the front side area, the electric flocculation cell and the filter membrane cell are arranged in the rear side area, and the rear side area further comprises an equipment room, and the reflux pump, air pump, backwashing pump and control components are arranged in the equipment room.

[0039] By integrating the pool body and the equipment room into a cubic structure, the device occupies a small area, is coordinated with the surrounding environment, is flexible to install, and is suitable for sporadic, scattered, small sewage treatment of service areas, toll stations, rural areas, towns, cities and enterprises. Secondly, the electrical equipment, control valves and other equipment are uniformly integrated and installed in the equipment room, which is convenient for equipment maintenance, repair and operation.

[0040] The preferred scheme ten: as the further optimization of the preferred scheme two, the anoxic tank, the aerobic tank is further provided with the floating sink net plate arranged above the aeration disc, in the state that the aeration disc is slightly opened, bubbles cannot escape from the floating sink net plate and gather on the floating sink net plate, so that the floating sink net plate increases the water volume and floats, the floating sink net plate floats and makes the gas escape from the floating sink net plate, and the floating sink net plate sinks;The liquid level sensor is arranged on the floating sink net plate, the electromagnetic valve and the liquid level sensor are electrically connected with the controller, and the controller controls the electromagnetic valve to be opened only after the floating sink net plate floats to the set height detected by the liquid level sensor.

[0041] In the process of micro-aeration, the floating sink net plate will repeatedly float up and down, thereby having a stirring effect on the sewage;The sewage is periodically and intermittently refluxed to the tank body where the actual anoxic reaction occurs, so as to control the anoxic state in the tank body where the actual anoxic reaction occurs. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a perspective view of the embodiment one of the present application;

[0043] Figure 2 It is a top view of the embodiment two of the present application;

[0044] Figure 3 It is a front view of the embodiment two of the present application;

[0045] Figure 4 It is a three-dimensional modeling display diagram of the embodiment one of the present application;

[0046] Figure 5 It is a front view of the embodiment one of the present application; 2 / O processing unit in the water flow schematic diagram;

[0047] Figure 6 It is a sectional view of the anaerobic tank of the embodiment four of the present application;

[0048] Figure 7 It is a sectional view of the anaerobic tank of the embodiment six of the present application;

[0049] Figure 8 It is Figure 7 It is an enlarged view of the blocking block in the first sliding position in the A part;

[0050] Figure 9 It is a schematic view of the blocking block in the third sliding position in the embodiment six of the present application;

[0051] Figure 10 It is a schematic view of the blocking block in the second sliding position in the embodiment six of the present application;

[0052] Figure 11 It is a sectional view of the anaerobic tank of the embodiment eight of the present application. Detailed Implementation

[0053] The following detailed description illustrates the specific implementation method:

[0054] The reference numerals in the accompanying drawings include: electrolytic cell 11, overflow port 111, anaerobic tank 12, anoxic tank 13, aerobic tank 14, sedimentation tank 15, electroflocculation tank 16, froth drain pipe 162, filter membrane tank 17, equipment room 18, clear water tank 19, clear water drain pipe 21, return pipe 22, return pump 23, ultraviolet disinfection equipment 24, air pump 25, sewage branch pipe 26, flotation screen 50, liquid level sensor 51, exhaust structure 52, rubber membrane 53, connecting pipe 54, main pipe 71, branch pipe 72, flow regulating valve 73, aeration disc 74, pressurization chamber 75, control rail 80, first stop block 81, second protrusion 82, block 521, compression spring 522, exhaust channel 523, one-way valve 524, push-button valve 525, and push rod 527.

[0055] Example 1:

[0056] The ECOF four-micro physicochemical membrane wastewater treatment process is based on the ECOF four-micro physicochemical membrane wastewater treatment device, which includes, in sequence, an electrolysis tank 11, an anaerobic tank 12, an anoxic tank 13, an aerobic tank 14, a sedimentation tank 15, an electrocoagulation tank 16, a filtration membrane tank 17, and a clear water tank 19. All tanks are integrated into a cubic structure, which also includes an equipment room 18 for installing various pumps, valves, pipes, etc. This cubic structure is made of 304 stainless steel; using stainless steel increases the lifespan of the wastewater treatment equipment by 3-5 times compared to carbon steel and fiberglass equipment. The integrated cubic structure reduces the footprint, making it suitable for scattered, small-scale wastewater treatment in service areas, toll stations, rural areas, towns, cities, and enterprises. The integrated cubic structure also facilitates equipment installation.

[0057] As attached Figure 1 , 4 As shown, the cubic structure includes a front region and a rear region. Electrolysis tank 11, clear water tank 19, anaerobic tank 12, anoxic tank 13, aerobic tank 14, and sedimentation tank 15 are located in the front region. These tanks are arranged sequentially along the length of the front region to allow for sequential wastewater flow. Since the electrolysis tank 11 only requires a small area for micro-electrolysis, and the clear water tank 19 temporarily stores the clear water needed for equipment operation, its clear water requirement is relatively small. Therefore, to fully utilize the space, the clear water tank 19 and the electrolysis tank 11 are arranged side-by-side along the width of the front region.

[0058] Electrolytic cell 11 is provided with electrolytic electrode, electrolytic electrode uses iron electrode plate, sewage through pipeline into electrolytic cell 11 electrolysis overflow to anaerobic tank 12;Anaerobic tank 12, anoxic tank 13, aerobic tank 14 and sedimentation tank 15 constitute an A 2 / O processing unit, sewage in A 2 / O processing unit can perform A 2 / O method of denitrification and phosphorus removal process. Electrolytic cell 11 to overflow port 111 of anaerobic tank 12 is arranged in the upper part, the communication port of anaerobic tank 12 to anoxic tank 13 is arranged in the lower part, the overflow port 111 of anoxic tank 13 to aerobic tank 14 is arranged in the upper part, the communication port of aerobic tank 14 to sedimentation tank 15 is arranged in the lower part;So as to prolong the time of sewage in the corresponding treatment tank. As shown in the drawings, the lower end of the aerobic tank 14 and the sedimentation tank 15 is arranged in an inclined manner, and the inclined plate is inclined to the sedimentation tank. In the aerobic tank 14, the water body in the sedimentation tank 15 is in a static state under aeration, so that the dust and particulate matter in the water body sink to form sludge, and the sludge slides into the aerobic tank 14 under the guidance of the inclined plate and flows again under the influence of aeration. Figure 5

[0059] A 2 / O processing unit also includes reflux system and aeration system. The reflux system includes reflux pump 23 and reflux pipe 22, and the reflux pipe 22 connected with the sedimentation tank 15 and the aerobic tank 14 is connected with the water inlet end of the reflux pump 23, and the reflux pipe 22 connected with the anaerobic tank 12 and the anoxic tank 13 is connected with the water outlet end of the reflux pump 23. In this embodiment, the reflux pipe 22 connected with the aerobic tank 14 and the anaerobic tank 12 is provided with a stop valve, and the sedimentation material at the bottom of the sedimentation tank 15 is refluxed to the anoxic tank 13 by starting the reflux pump 23, and whether the sewage in the aerobic tank 14 is refluxed and whether it is refluxed to the anaerobic tank 12 can be controlled by the stop valve connected with the reflux pipe 22 according to the nitrogen and phosphorus content in the sewage. In addition, the port of the reflux pipe connected with the sedimentation tank 15 is arranged at the edge of the inclined plate, so that the sewage can be refluxed to the anoxic tank 13 through the reflux pipe connected with the sedimentation tank 15, which can avoid the sludge at the bottom of the sedimentation tank 15 from blocking the communication port between the sedimentation tank and the aerobic tank 14. Secondly, in order to increase the reflux combination mode, the reflux pipe 22 connected with the sedimentation tank 15 and the anaerobic tank 12 can also be provided with a stop valve. The aeration system includes air pump 25 and aeration disc 74 arranged at the bottom of anaerobic tank 12, anoxic tank 13 and aerobic tank 14, and air pump 25 is connected with aeration disc 74 through pipeline, which includes main pipe 71 connected with air pump 25 and branch pipe 72 directly connected with aeration disc 74, branch pipe 72 corresponds to anaerobic tank 12, anoxic tank 13 and aerobic tank 14, and flow valve is arranged on branch pipe 72 to adjust the aeration amount entering anaerobic tank 12, anoxic tank 13 and aerobic tank 14. In this embodiment, air pump 25 is provided with two, and the two air pumps 25 work alternately. ​

[0060] The supernatant of the sewage in the sedimentation tank 15 is overflowed to the electric flocculation tank 16. The electric flocculation tank 16 is provided with an aluminum electrode. The sewage after the sedimentation in the sedimentation tank 15 still contains suspended solids and colloidal pollutants. Through the action of the electric field, the anode generates electrons to form "micro flocculants" of aluminum hydroxide, and the electrolysis produces flocculants to make the suspended solids and colloidal pollutants in the water precipitate, thereby solving the problems of manual addition of reagents and reagents.

[0061] The supernatant of the electric flocculation tank 16 is overflowed to the filter membrane tank 17. The filter membrane tank 17 is provided with a stainless steel fine filter assembly. The stainless steel fine filter assembly adopts a stainless steel nanometer 316L membrane. The inner layer of the stainless steel fine filter assembly is connected to a clear water discharge pipe 21. The clear water discharge pipe 21 extends to a clear water tank 19. The clear water in the filter membrane tank 17 and the clear water tank 19 is discharged to the clear water tank 19 through the difference in height. A backwashing pump is connected to the clear water discharge pipe 21 through a bypass pipe. A stop valve is provided on the clear water discharge pipe 21 in parallel with the backwashing pump. When the stop valve on the clear water discharge pipe 21 is closed and the backwashing pump is started, the clear water in the clear water tank 19 is pumped into the inner layer of the stainless steel fine filter assembly and then discharged through the filter holes, thereby removing the attachments on the stainless steel fine filter assembly.

[0062] The clear water tank 19 is connected to a drain pipe for drainage. An ultraviolet disinfection device 24 is provided between the drain pipe and the clear water tank 19. The ultraviolet disinfection device 24 is installed in the equipment room 18. The use of ultraviolet tube disinfection can more efficiently kill Escherichia coli in sewage and solve the problem of poor disinfection effect. Compared with chemical disinfection, there is no need to regularly add chemical reagents.

[0063] The electric flocculation tank 16 and the filter membrane tank 17 are connected to a sewage discharge system. The sewage discharge system includes a sewage main pipe and sewage branch pipes 26 connected to the sewage main pipe. The sewage branch pipes 26 are respectively connected to the bottoms of the electric flocculation tank 16 and the filter membrane tank 17. Stop valves are provided on the sewage branch pipes 26. In order to facilitate the accumulation of sediments at the bottom and facilitate the discharge of sediments, the bottoms of the electric flocculation tank 16 and the filter membrane tank 17 are funnel-shaped. In order to facilitate the layout of the sewage branch pipes 26, the lower ends of the funnel-shaped bottoms of the electric flocculation tank 16 and the filter membrane tank 17 are staggered. As the sewage treatment continues, the sediments at the bottoms of the electric flocculation tank 16 and the filter membrane tank 17 gradually increase. By opening the stop valves on the sewage branch pipes 26, the sediments at the bottoms of the corresponding electric flocculation tank 16 or filter membrane tank 17 can be removed.

[0064] Secondly, the bottom of the electrolytic tank 11 is funnel-shaped. The bottom of the electrolytic tank 11 is also connected to a sewage branch pipe 26 to remove the sediments at the bottom of the electrolytic tank 11.

[0065] The specific implementation process is as follows:

[0066] Step one: sewage is introduced into the electrolytic cell 11, and the sewage is electrolyzed by applying direct current on the iron electrode to break the bonds of the refractory macromolecules and break the wall, and the sewage is subjected to micro-electrolysis treatment. The micro-electrolysis current is controlled at 3-40 A, the current is 50 Hz pulse current, and the voltage is 24 V direct current.

[0067] During the electrolysis process, due to the continuous entry of sewage into the electrolytic contact, the electrolysis breaks the bonds of the refractory macromolecular organic matter in the sewage, breaks the wall, and changes the physical properties, so that the macromolecular organic matter is electrolyzed into small molecular organic matter and inorganic matter; the small molecular organic matter floats and overflows into the anaerobic tank 12 with the sewage, providing a carbon source for subsequent biochemical treatment; during the electrolysis process, the iron ions released by the iron electrode combine with the chlorine ions in the sewage to form iron salt, which plays a flocculating role to make the inorganic matter generated by electrolysis gather and accelerate its sinking to the bottom to form sludge, achieving the purpose of phosphorus removal.

[0068] Secondly, while the sewage is electrolyzed, the sewage will overflow into the A 2 / O treatment unit, which first enters the anaerobic tank 12; since electrolysis will increase the water temperature, and temperature rise can activate the microorganisms in the A 2 / O treatment unit.

[0069] Step two (2.1): by judging the water quality of the sewage in the A 2 / O treatment unit, the sewage treatment mode in the A 2 / O treatment unit is dynamically adjusted by backflow and aeration amount, and the sewage treatment mode can be switched between AO, AAO, and AOAO.

[0070] The following is an example:

[0071] When the concentrations of nitrogen, phosphorus, and COD in the sewage are low, the aeration discs 74 in the anaerobic tank 12 and the anoxic tank 13 are closed, and anaerobic reactions are carried out in the anaerobic tank 12, the anoxic tank 13, and the sedimentation tank 15. The aeration disc 74 in the aerobic tank 14 is completely opened to perform aerobic reaction; that is, the sewage treatment mode is AO mode, which can achieve the purpose of sewage treatment while saving energy.

[0072] If the concentrations of nitrogen, phosphorus, and COD in the sewage are at a medium level, the sewage in the sedimentation tank 15 is backflowed to the anaerobic tank 12, and the aeration disc 74 in the anaerobic tank 12 is slightly opened to form a micro-aeration state, thereby executing the AAO mode; the removal of organic matter, nitrogen, and phosphorus by the AAO process is obvious.

[0073] If the concentrations of nitrogen, phosphorus and COD in the sewage are high, the anaerobic reaction is mainly carried out in the sedimentation tank 15, while the aeration disc 74 in the anaerobic tank 12 is slightly opened to form a micro-aeration state, and the aeration disc 74 in the anoxic tank 13 is fully opened to form an anoxic reaction state, i.e. the aerobic reactions are carried out in the anoxic tank 13 and the aerobic tank 14, and the sewage in the sedimentation tank 15 and the aerobic tank 14 is backflowed into the anaerobic tank 12. This state is still the AA0 mode, but in this state, the aerobic reactions have more reaction space, which enhances the removal of organic matter, nitrogen and phosphorus.

[0074] If the concentrations of nitrogen, phosphorus and COD in the sewage are very high, the anaerobic reaction can still be carried out in the sedimentation tank 15, while the aeration disc 74 in the anaerobic tank 12 is fully opened to form an aerobic reaction state, and the aeration disc 74 in the anoxic tank 13 is slightly opened to form an anoxic reaction state; and the sewage in the sedimentation tank 15 and the aerobic tank 14 is shunted and randomly backflowed into the anaerobic tank 12 and the aerobic tank 14. This state is the AOAO mode, which still has a large aerobic reaction space and disperses different reaction spaces, which helps to improve the removal efficiency of organic matter, nitrogen and phosphorus.

[0075] Of course, according to the real-time or periodic detection of the water quality of the sewage in the A 2 / O treatment unit, other combinations of aeration amount and backflow mode can be used to form other reaction modes.

[0076] Step two: (2.1) according to the change of the water quality of the sewage in the A 2 / O treatment unit, the A 2 / O treatment unit is fed with a microbial carrier, which can be a porous ceramic or a volcanic rock, so that the microorganisms can attach and reproduce. The porous microbial carrier has gradually increasing internal pores from the inside to the surface, and the density of the porous microbial carrier is 1.0-1.2 times the density of water.

[0077] As the sewage treatment continues, part of the microbial carrier will be discharged from the A 2 / O treatment unit with the water flow. The decrease of the microbial carrier will slow down the growth and reproduction of the microorganisms, which will lead to a decrease in the efficiency of sewage treatment, so it is necessary to supplement the microbial carrier before the efficiency of sewage treatment decreases to the set basic efficiency.

[0078] Secondly, the center of the porous microbial carrier has low dissolved oxygen levels due to its small pores and slow flow to the external water, creating an anaerobic environment. In contrast, the middle section of the porous microbial carrier has larger pores and a faster flow rate to the external water, resulting in a microaerobic environment. The surface of the porous microbial carrier has the largest pores and is in direct contact with the external water, thus exhibiting an aerobic environment when the dissolved oxygen in the external water is sufficient. In other words, during the recirculation of water from the aerobic tank 14 to the anoxic tank 13 and anaerobic tank 12, anaerobic, microaerobic, and aerobic reactions will occur on the porous microbial carrier in any area of ​​the water, thereby improving the efficiency of wastewater biological treatment. Furthermore, the infiltration of oxygenated wastewater into the porous microbial carrier slows down oxygen escape, thus reducing the aeration rate during the aerobic stage. This allows the oxygen requirements for aerobic reactions to be met under microaerobic conditions, preventing the wastewater from violently churning and overflowing within small treatment equipment to maintain the dissolved oxygen levels needed for aerobic reactions. Therefore, the combined effects of micro-electrolysis, micro-aerobic processes, and micro-carriers provide sufficient conditions for short-range wastewater treatment.

[0079] In addition, with the disturbance of water recirculation and aeration, the porous microbial carrier will float in the water, which is conducive to the entry of sewage into the microbial carrier and allows the microbial carrier to obtain dissolved oxygen; under static conditions, the porous microbial carrier can also settle.

[0080] Step 3: Wastewater overflows from sedimentation tank 15 to electrocoagulation tank 16. The aluminum electrodes of electrocoagulation tank 16 are turned on, with a current intensity of 3-40A and a voltage of DC 24V. Under the action of the electric field, electrons are generated at the anode to form aluminum hydroxide, a "micro-flocculator". Electrolysis produces flocculants, causing suspended solids and colloidal pollutants in the water to precipitate.

[0081] Step 4: After passing through the electrostatic precipitator 16, the wastewater enters the membrane filtration tank 17, and after being filtered by the membrane, the clean water is discharged; the clean water can be discharged after disinfection.

[0082] Step 5: Periodically remove the sludge from the bottom of the electrostatic precipitator 16 and the filter membrane tank 17, leaving some sludge at the bottom during removal. Incomplete removal of sludge promotes the growth and reproduction of microorganisms in the water.

[0083] Step 6: Periodically backwash the filter membrane to ensure its water permeability.

[0084] Example 2:

[0085] The difference between Example 2 and Example 1 is as follows: Figure 2 , 3As shown in Embodiment 2, both the electrolytic cell 11 and the electrocoagulation cell 16 are equipped with a foam discharge structure at their upper parts. The foam discharge structure includes a funnel-shaped guide channel located below the liquid surface and a foam discharge pipe 162 connected to the bottom of the guide channel and extending outward. The distance between the top of the guide channel and the liquid surface is 3-5 mm. Due to the complex composition of impurities in wastewater, a large amount of foam will be generated during the electrolysis and electrocoagulation processes. The guide channel of the foam discharge mechanism is slightly lower than the liquid surface. Under the action of water tension, the water will not rush in and fill the guide channel in a large amount at once, but will flow slowly downward along the side wall of the guide channel, thereby carrying the foam out under the action of the water flow, achieving the purpose of foam removal.

[0086] Example 3:

[0087] The difference between Example 3 and Example 1 is that in Example 3, a bypass pipe is provided on the sewage branch pipe 26 connected to the electrostatic precipitator 16 and the filter membrane tank 17. An electrically controlled shut-off valve is provided on the bypass branch pipe 72 in parallel with the shut-off valve, so that sewage can be discharged manually or automatically by electrical control.

[0088] Electrically controlled shut-off valves are installed on the return pipes 22 connecting to the anaerobic tank 12, anoxic tank 13, aerobic tank 14, and sedimentation tank 15 to select the return combination mode via electrical control. Secondly, the flow valves installed on the branch pipes 72 connecting to the aeration discs 74 in the exhaust system are also electrically controlled flow valves to control the aeration rate via electrical control.

[0089] The aerobic tank 14 is equipped with an online nitric acid sensor, and the sedimentation tank 15 is connected to an online COD monitor. The online nitric acid sensor and the online COD monitor are connected to the control signal input terminal of the controller. The electrically controlled shut-off valve, the electrically controlled flow valve, and other electrical equipment are all electrically connected to the execution signal output of the controller. Furthermore, the controller's signal input terminal is also connected to a wireless receiving module. By connecting the terminal to the wireless receiving module, the electrical equipment can be remotely controlled.

[0090] Based on feedback values ​​from the online nitric acid sensor and online COD monitor, the controller controls the aeration disc 74 and the electrically controlled shut-off valve controlling the reflux to adjust A. 2 The / O processing unit is controlled in different processing modes, thereby automatically adjusting the processing mode.

[0091] Example 4:

[0092] The difference between Example 4 and Example 1 is as follows: Figure 6As shown, a stop valve is arranged on the reflux pipe 22 connected with the anaerobic tank 12, the anoxic tank 13, the aerobic tank 14 and the sedimentation tank 15. A floating and sinking net plate 50 is slidably connected in the anaerobic tank 12 and the anoxic tank 13 and arranged horizontally and can slide in the vertical direction. The floating and sinking net plate 50 is made of a porous thin aluminum plate. After the floating and sinking net plate 50 sinks to the bottom, when the air diffuser 74 upwardly diffuses air, the air can penetrate the floating and sinking net plate 50 to float upwardly. The floating and sinking net plate 50 can also disperse air bubbles to avoid that the oxygen content is too high in a local area under the anoxic treatment condition. Secondly, the porous structure of the floating and sinking net plate 50 allows the micro-bubbles to adhere to the floating and sinking net plate 50.

[0093] When the anaerobic tank 12 and the anoxic tank 13 are in the micro-aeration state (i.e. the aeration amount is small, and the water body is in the micro-oxygen dissolving state), since the aeration amount is small, the vibration of the water body caused by the aeration is also small. The air bubbles form a plurality of micro-bubbles after passing through the floating and sinking net plate 50, and in combination with the porous structure of the floating and sinking net plate 50, part of the micro-bubbles will be adsorbed on the floating and sinking net plate 50. The adsorption of the air bubbles on the floating and sinking net plate 50 will increase the buoyancy of the floating and sinking net plate 50, so that the floating and sinking net plate 50 floats upwardly. The air bubbles adsorbed on the floating and sinking net plate 50 will be subjected to a reduced pressure and a disturbance caused by the floating and sinking net plate 50 floating upwardly, and part of the air bubbles adsorbed on the floating and sinking net plate 50 will break, so that the floating and sinking net plate 50 will sink. Therefore, during the micro-aeration process, the floating and sinking net plate 50 will repeatedly float upwardly and sink downwardly, thereby having a stirring effect on the sewage.

[0094] The stop valve connected with the anaerobic tank 12 and the anoxic tank 13 is an electrically controlled stop valve, and the floating and sinking net plate 50 is provided with a liquid level sensor 51. The electrically controlled stop valve and the liquid level sensor 51 are electrically connected with a controller. After the floating and sinking net plate 50 floats to a certain height, the controller controls the electrically controlled valve to be opened through the height feedback of the liquid level sensor 51, so that the sewage in the sedimentation tank 15 and the aerobic tank 14 starts to reflux. The refluxed sewage is located below the floating and sinking net plate 50, and the flow of the refluxed sewage will further promote the breakage of the air bubbles adhered to the floating and sinking net plate 50. After the floating and sinking net plate 50 sinks, the electrically controlled stop valve is closed. Therefore, with the floating and sinking of the floating and sinking net plate 50, the sewage will be periodically and intermittently refluxed. Since the dissolved oxygen content of the sewage refluxed to the anaerobic tank 12 and the anoxic tank 13 is high, the intermittent reflux is beneficial to control the dissolved oxygen content of the water body in the anoxic reaction. Secondly, the intermittent reflux is beneficial to the dispersion of the sewage with a high dissolved oxygen content in the anoxic tank 13 for a sufficient time, so as to avoid that the local area in the anoxic tank 13 has a too high dissolved oxygen content, thereby affecting the activity of the bacteria in the anoxic tank 13. That is, in the step two of the embodiment one, when the anaerobic tank 12 or the anoxic tank 13 performs the anoxic reaction, the sewage refluxed to the tank actually performing the anoxic reaction is periodically and intermittently refluxed, so as to control the anoxic state in the tank actually performing the anoxic reaction.

[0095] Embodiment five:

[0096] The difference between Example Five and Example Four is that, as shown in the accompanying drawings, the structure of the floating and sinking net plate 50 is different. The floating and sinking net plate 50 in Example Five comprises an upper plate, a lower plate and an expansion mechanism, the upper plate and the lower plate are buckled and a sandwich is formed therebetween, a plurality of opposite first through holes are provided on the upper plate and the lower plate, the first through holes on the upper plate and the lower plate are connected by a connecting pipe 54, the connecting pipe 54 is in a shape of a middle contraction and two end flares, so as to facilitate the dispersion of airflow during aeration and facilitate the passage of bubbles through the through holes. The upper plate, the lower plate and the pipe enclose a closed space in the sandwich, and the upper plate and the lower plate are further provided with second through holes, the expansion mechanism comprises a rubber film 53 covering the second through holes, so that when the pressure in the sandwich increases, the rubber film 53 expands, and the buoyancy of the floating and sinking net plate 50 in water increases. Figure 7

[0097] The expansion mechanism further comprises a booster chamber 75 provided on the branch pipe 72 connected with the aeration disc 74, the booster chamber 75 is connected with the main pipe 71 at one end with a larger diameter than the other end connected with the aeration disc 74, and the inner diameter of the booster chamber 75 is larger than the diameter of the branch pipe 72. After the airflow enters the booster chamber 75 from the main pipe 71, the pressure in the booster chamber 75 will increase due to the fact that the end connected with the aeration disc 74 is in a shape of a contraction, and the greater the airflow flow rate in the main pipe 71, the greater the pressure in the booster chamber 75. The sandwich of the floating and sinking net plate 50 is connected with the booster chamber 75 through a hose, so that the sewage does not enter the booster chamber 75 without aeration, and the booster chamber 75 is arranged above the liquid surface.

[0098] ​The expansion mechanism further comprises an exhaust structure 52, which comprises a block 521 slidably connected to the side of the floating net plate 50, the block 521 being arranged in the interlayer and extending to the outside, the inner end of the block 521 in the interlayer being provided with a limiting plate, and a compression spring 522 being arranged between the limiting plate and the side of the floating net plate 50. The block 521 is provided with an exhaust passage 523, and a one-way valve 524 is arranged in the exhaust passage 523, which is only used for exhausting the airflow in the interlayer, both ports of the exhaust passage 523 are located on the side of the block 521, and the block 521 comprises three sliding positions; the first sliding position: both ports of the exhaust passage 523 are located in the interlayer (the gas in the interlayer cannot be exhausted through the exhaust passage 523), the second sliding position: the two ports of the exhaust passage 523 are located in the interlayer and outside respectively (the gas in the interlayer is exhausted), and the third sliding position: both ports of the exhaust passage 523 are located outside (the gas in the interlayer cannot be exhausted). The exhaust structure 52 further comprises a control rail 80 vertically arranged at the corresponding position of the block 521, the lower part of the control rail 80 is provided with a first stop block 81, when the pressure in the interlayer is relatively large, the block 521 slides out and is located at the third sliding position, so that the first stop block 81 limits the block 521 to block the upward sliding of the floating net plate 50. The upper part of the control rail 80 is provided with a second protruding part 82, the lower end of the second protruding part 82 is provided with a wedge surface, the second protruding part 82 is made of a permanent magnet, and the block 521 is made of stainless steel; when the floating net plate 50 floats and is opposite to the second protruding part 82, the second protruding part 82 attracts the block 521 out and limits the block 521 to the second sliding position, the gas in the interlayer is exhausted, the rubber film 53 is retracted, and then the floating net plate 50 sinks, so that the floating net plate 50 repeatedly floats and sinks up and down.

[0099] Because the aeration amount in the corresponding reaction tank is large when the sewage performs the aerobic reaction, the sewage will roll violently; therefore, the up-and-down floating of the aluminum net plate is not needed to agitate the water body in this stage.

[0100] In the fifth embodiment, when the floating net plate 50 sinks to the bottom, the aeration disc 74 below the floating net plate 50 is adjusted to be in the fully open state, the pressure in the pressure chamber 75 and the interlayer will rapidly increase, and when the floating net plate 50 has not passed the first stop block 81 in the upward process, the block 521 has already completely stretched out to the third sliding position, so that the first stop block 81 blocks the lower part of the aluminum net plate through the block 521. That is, when the reaction tank performs the aerobic reaction, the floating net plate 50 is located at the lower part of the aerobic tank 14, and the floating net plate 50 further disperses the airflow above the aeration disc 74.

[0101] When the floating screen 50 sinks to the bottom, the aeration disc 74 below it is adjusted to be slightly open. Due to the small airflow into the pressurization chamber 75 and the interlayer, the air intake is slow. Therefore, the extension of the block 521 is also relatively slow. After the floating screen 50 passes the first stop 81, the block 521 has not yet reached the position of the first stop 81. The floating screen 50 will continue to rise. When the block 521 corresponds to the second protrusion 82, the magnetic attraction of the second protrusion 82 will independently position it in the second sliding position. The air in the interlayer will be discharged through the exhaust channel 523, and the floating screen 50 will sink. This process is repeated, and the floating screen 50 will float and sink repeatedly, forming a technical effect similar to that of Embodiment 4.

[0102] In Embodiment 5, during the switch from micro-aeration to full opening of the aeration disc 74, the floating screen 50 must initially be at the bottom. Only after the aeration disc 74 is fully open can the floating screen 50 be contained at the bottom. Therefore, in step two of Embodiment 1, when switching the state of the aeration disc 74, aeration is stopped first, and then the state to be switched is entered, i.e., the aeration disc 74 is lowered to the bottom by stopping aeration.

[0103] Example 6:

[0104] The difference between Example 6 and Example 5 is as follows: Figure 8 Appendix Figure 10 As shown in Embodiment Six, the exhaust channel 523 within the block 521 is equipped with a push-button valve 525 near its outer end. The push-button valve 525 has a push-button rod 527 extending outward from the block 521. When the floating mesh plate 50 is in the position of the second protrusion 82, the second protrusion 82 attracts the block 521, the push-button rod 527 is pressed, and the push-button valve 525 opens; when the push-button rod 527 is not pressed, the push-button valve 525 closes. This ensures that the internal interlayer can only exhaust through the exhaust channel 523 when the floating mesh plate 50 is in the position of the second protrusion 82, allowing for more precise control of the exhaust range.

[0105] Example 7:

[0106] The difference between Example 7 and Example 6 is that in Example 7, the rubber membrane 53 is provided with air holes. As the rubber membrane expands, the air holes will enlarge, and the airflow in the interlayer will be discharged through the air holes, so the floating and sinking mesh plate 50 also has an aeration function; and the greater the air pressure in the interlayer, the larger the air holes and the greater the aeration volume; when the air pressure in the interlayer decreases, the air holes decrease and the aeration volume decreases; when the rubber membrane 53 is completely contracted, the air holes close.

[0107] Therefore, in this embodiment, when an aerobic reaction is required in the anoxic tank 13, the aeration disc 74 is fully open, the pressure in the interlayer increases rapidly, and the block 521 quickly slides to the third sliding position. The floating and sinking screen 50 is then limited by the first stop 81. At this time, the pores can also provide a large aeration volume. During the anoxic reaction, the aeration disc 74 is slightly open, the pressure in the interlayer increases slowly, and the block 521 extends slowly. When the floating and sinking screen 50 reaches the position of the first stop 81, the position of the block 521 can pass the first stop 81, after which the floating and sinking screen 50 begins to float and sink repeatedly; during this process, the pores are also in a state of micro-aeration.

[0108] Example 8:

[0109] The difference between Example 8 and Example 7 is as follows: Figure 11 As shown in Example 8, the floating and sinking mesh plate 50 completely replaces the aeration discs 74 in the anaerobic tank 12, the anoxic tank 13 and the aerobic tank 14, and the branch pipe 72 connected to the aeration disc 74 is directly connected to the interlayer of the floating and sinking mesh plate 50 through a flexible hose.

[0110] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An ECOF four-micro physicochemical membrane small-scale wastewater treatment device, characterized in that: It includes an electrolysis tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, an electrocoagulation tank, and a filtration membrane tank arranged in sequence; The electrolytic cell is equipped with iron electrodes, and a DC voltage of 12-36V is applied across the iron electrodes. The electrolysis current is controlled at 3-40A. Wastewater enters the electrolytic cell through a pipe, is electrolyzed, and then overflows into the anaerobic tank. An anaerobic tank, an anoxic tank, an aerobic tank, and a sedimentation tank together form an A 2 / O treatment unit, wastewater in A 2 The / O processing unit can execute A 2 / O method for nitrogen and phosphorus removal process; The A 2 The / O treatment unit also includes a reflux system and an aeration system. The reflux system pumps the sediment from the bottom of the aerobic tank and / or sedimentation tank into the anaerobic tank and / or anoxic tank through a reflux pump. The reflux pipes connected to the anaerobic tank, anoxic tank, aerobic tank and sedimentation tank are independently controlled. The aeration system includes aeration discs located at the bottom of the anaerobic tank, anoxic tank and aerobic tank and are independently controlled. The aerobic tank is equipped with an online nitric acid sensor. The return pipes connecting to the anaerobic, anoxic, aerobic, and sedimentation tanks are all equipped with solenoid valves. Solenoid throttling valves are installed on the pipes connecting to the aeration discs located at the bottom of the anaerobic, anoxic, and aerobic tanks. The online nitric acid sensor is connected to the controller's control signal input terminal, while the solenoid valves and solenoid throttling valves are connected to the controller's execution signal output terminal. The online nitric acid sensor detects the nitrogen content of the wastewater in the aerobic tank. The controller uses the feedback value from the online nitric acid sensor to control the wastewater return range and aeration rate, thereby dynamically switching between different treatment methods based on the wastewater influent conditions to ensure optimal wastewater treatment efficiency while maintaining wastewater treatment quality. The anoxic and aerobic tanks are also equipped with floating and sinking screens located above the aeration discs. When the aeration discs are slightly open, the air bubbles cannot escape quickly from the floating and sinking screens and instead gather near them. This increases the volume of water displaced by the screens, causing them to float. As the screens rise, the gas escapes from them, and the screens sink. A level sensor is installed on the screens. Both the solenoid valve and the level sensor are electrically connected to the controller. When the level sensor detects that the screens have risen to a set height, the controller uses the height feedback from the level sensor to open the solenoid valve. The supernatant from the sedimentation tank overflows into the electrocoagulation tank, which is equipped with aluminum electrodes. The supernatant from the electrocoagulation tank overflows into the filtration membrane tank. The filter membrane tank is equipped with a stainless steel fine filter assembly. The inner layer of the stainless steel fine filter assembly is connected to a clean water drain pipe. The clean water filtered by the stainless steel fine filter assembly is discharged through the clean water drain pipe.

2. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 1, characterized in that: The aerobic tank and the sedimentation tank are separated by a partition. The lower end of the partition is set as an inclined plate that slopes towards the sedimentation tank. The lower edge of the inclined plate forms a connection between the sedimentation tank and the aerobic tank with the side wall of the sedimentation tank.

3. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 1, characterized in that: It also includes a clear water tank, a clear water drain pipe connected to the clear water tank, a clear water tank connected to a drain pipe for drainage, and an ultraviolet disinfection device between the drain pipe and the clear water tank.

4. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 3, characterized in that: A backwash pump is connected to the clean water drain pipe via a bypass pipe, and a shut-off valve connected in parallel with the backwash pump is installed on the clean water drain pipe.

5. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 4, characterized in that: It also includes a sewage system, which includes a main sewage pipe and branch sewage pipes connected to the main sewage pipe. The branch sewage pipes are respectively connected to the bottom of the electrolytic cell, the filter membrane cell and the electrolytic cell, and are equipped with shut-off valves.

6. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 5, characterized in that: The bottom of the electrolytic cell, the filter membrane cell, and the electrolytic cell are configured in a funnel shape.

7. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 6, characterized in that: The aeration system includes at least two air pumps that operate alternately.

8. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 7, characterized in that: Both the electrolytic cell and the electroflocculation cell are equipped with a foam discharge structure at the top. The foam discharge structure includes a funnel-shaped guide channel located below the liquid surface and a foam discharge pipe connected to the bottom of the guide channel and extending outward. The distance between the top of the guide channel and the liquid surface is 3-5 mm.

9. The ECOF four-micro physicochemical membrane small-scale wastewater treatment device according to claim 8, characterized in that: The electrolytic cell, anaerobic cell, anoxic cell, aerobic cell, sedimentation cell, electroflocculation cell, filtration membrane cell, and clear water cell are integrated into the same cubic structure. The cubic structure is divided into a front area and a rear area. The electrolytic cell, anaerobic cell, anoxic cell, aerobic cell, sedimentation cell, and clear water cell are arranged in the front area, while the electroflocculation cell and filtration membrane cell are arranged in the rear area. The rear area also includes an equipment room, where the return pump, air pump, backwash pump, and control components are located.

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