CN216106514U

CN216106514U - Sewage treatment system based on AO-MBBR-inductive coupling filtering pond

Info

Publication number: CN216106514U
Application number: CN202122299162.8U
Authority: CN
Inventors: 徐芝芬; 韦春满; 李金城; 覃雪云; 邓培煌
Original assignee: Yixing Kingdom Environmental Prot Equipment Co ltd; Jiangsu Jinxi Environmental Technology Co ltd
Current assignee: Yixing Kingdom Environmental Prot Equipment Co ltd; Jiangsu Jinxi Environmental Technology Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-03-22
Anticipated expiration: 2031-09-22

Abstract

The utility model discloses a sewage treatment system based on an AO-MBBR-inductively coupled filter, which comprises an anoxic tank, an aerobic tank, a sedimentation tank, a constant-voltage direct-current power supply and one-stage or multi-stage inductively coupled filters; the bottom in the oxygen deficiency pond and the bottom in good oxygen pond communicate each other, the top lateral wall and the sedimentation tank intercommunication in good oxygen pond, the top lateral wall of sedimentation tank with the inductive coupling filtering pond intercommunication has laid the electrode matrix in the inductive coupling filtering pond, constant voltage DC power supply and electrode matrix electrical connection are equipped with second aeration lateral conduit in the bottom in inductive coupling filtering pond, and the level is provided with the perforation baffle in the inductive coupling filtering pond that is close second aeration lateral conduit top, be provided with the aeration person in charge of mutual intercommunication between inductive coupling filtering pond and oxygen deficiency pond and the good oxygen pond. The utility model combines AO, MBBR and the inductive coupling filter technology to effectively remove nitrogen, phosphorus and organic matters in domestic sewage and reach the standard discharge.

Description

Sewage treatment system based on AO-MBBR-inductive coupling filtering pond

Technical Field

The utility model belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment system based on an AO-MBBR-inductively coupled filter.

Background

China is a big agricultural country, countryside population is large, and village sewage discharge has the characteristics of small sewage quantity, large change of water quality and water quantity, obvious intermittent discharge, relatively simple sewage components and the like according to living habits of rural residents in China. However, due to the reasons of unplanned village and town layout, inadequate government capital investment and the like, the treatment of sewage in rural areas in China lacks corresponding facilities and equipment, so that most domestic sewage is directly discharged without being treated. The rural domestic sewage which is discharged randomly not only pollutes underground water, but also causes nitrogen and phosphorus eutrophication in lakes, even causes black and odorous water to be generated, and seriously threatens the ecological environment. At present, a distributed rural sewage treatment system is popularized and applied in a large range of engineering, and processes commonly used by the distributed system in treating rural sewage comprise AO and A²O, MBR, MBBR and the like, the running and effluent quality is relatively stable, and in some areas with relatively developed economy or special water functional areas, the water quality of the rural sewage after treatment is required to meet higher requirements, particularly nitrogenAnd the control of phosphorus puts forward higher requirements, while the common process of a distributed system is limited by the nitrogen and phosphorus removal rate of a biological method when water is fed with high nitrogen and high phosphorus, and the phosphorus removal rate can only reach 35-60% generally, and the higher emission requirement is hardly reached. Therefore, the fundamental purpose of rural domestic sewage treatment is to protect the water environment, and the most main pollutants are nitrogen, phosphorus and organic pollutants. Therefore, how to design a simple process and a simple device to simultaneously remove nitrogen, phosphorus and organic matters, meet the emission requirement and stably operate for a long time is a prominent problem in the field of environmental protection at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sewage treatment system based on an AO-MBBR-inductively coupled filter, which is based on the difficulties of small sewage treatment amount, large water quality and water quantity change, difficult centralized treatment and the like of rural domestic sewage at the present stage, can effectively remove nitrogen, phosphorus and organic matters in the domestic sewage and can reach the standard discharge by combining the AO, MBBR and inductively coupled filter technologies on pollutants in the sewage. In order to achieve the purpose, the utility model adopts the following technical scheme:

according to one aspect of the utility model, a sewage treatment system based on an AO-MBBR-inductively coupled filter tank is provided, and comprises an anoxic tank, an aerobic tank, a sedimentation tank, a constant-voltage direct-current power supply and one-stage or multi-stage inductively coupled filter tanks; the bottom in oxygen deficiency pond and the bottom in good oxygen pond communicate each other, the top lateral wall and the sedimentation tank intercommunication in good oxygen pond, the top lateral wall of sedimentation tank with the inductive coupling filtering pond intercommunication has laid the electrode matrix in the inductive coupling filtering pond, constant voltage DC power supply and electrode matrix electrical connection are equipped with second aeration lateral conduit in the bottom in inductive coupling filtering pond, and the level is provided with the perforation baffle in the inductive coupling filtering pond that is close second aeration lateral conduit top, be provided with the aeration person in charge of mutual intercommunication between inductive coupling filtering pond and oxygen deficiency pond and good oxygen pond (2).

Preferably, the bottom in the anoxic tank and the bottom in the aerobic tank are respectively provided with a first aeration branch pipe, aeration discs are uniformly distributed on the first aeration branch pipe, the first aeration branch pipes in the anoxic tank and the aerobic tank are respectively communicated with the aeration main pipe through a first air guide branch pipe, the aeration main pipe is provided with an air blower, the first aeration branch pipes in the anoxic tank and the aerobic tank and positioned above the first aeration branch pipes are respectively provided with combined filler and MBBR filler, the first air guide branch pipe is provided with a first air check valve, the side wall at the top end of the aerobic tank is provided with a water through hole, the sedimentation tank is internally provided with an L-shaped conveying pipe communicated with the water through hole, the upper end of the L-shaped conveying pipe is connected to the water outlet side of the water through hole, and the other end of the L-shaped conveying pipe extends downwards to be close to the upper part of the bottom of the sedimentation tank, the top side wall of the sedimentation tank on the opposite side of the water passing hole is provided with a triangular weir water outlet, and the top side wall of the sedimentation tank is communicated with the top side wall of the inductive coupling filter tank through the triangular weir water outlet.

The above scheme is preferred, the inductive coupling filtering pond includes the one-level inductive coupling filtering pond and the second grade inductive coupling filtering pond of constituteing by the two-stage filtering pond, is being kept away from the top lateral wall of the second grade inductive coupling filtering pond of one-level inductive coupling filtering pond one side and is being provided with out the basin, the top lateral wall of sedimentation tank pass through triangle weir delivery port with the top lateral wall intercommunication of one-level inductive coupling filtering pond, the bottom in one-level inductive coupling filtering pond and the bottom in second grade inductive coupling filtering pond communicate each other, the perforation baffle level runs through the bottom top and the second grade inductive coupling filtering pond top that set up in one-level inductive coupling filtering pond, the one end of perforation baffle is connected on the one-level inductive coupling filtering pond lateral wall in triangle weir delivery port one side, the other end of perforation baffle is connected on the second grade inductive coupling filtering pond lateral wall in play basin one side, second aeration branch pipeline level sets up in the bottom in the one-level inductive coupling filtering pond of perforation baffle below and the second grade inductive coupling filtering pond And a second air guide branch pipe which is arranged at one side close to the water outlet of the triangular weir, extends downwards from the top end of the primary inductive coupling filter tank to the bottom end and is communicated with the second aeration branch pipe and the aeration main pipe, the electrode matrixes are respectively arranged in the primary inductive coupling filter tank and the secondary inductive coupling filter tank, and a second air check valve is arranged on the second air guide branch pipe.

Preferably, in the above scheme, the electrode matrix is an electrode array formed by columnar electrodes distributed at intervals.

Preferably, porous phosphorus removal fillers with the particle size of 10-30 mm are respectively paved between the positions, below the level of the water outlet of the triangular weir, in the primary inductive coupling filter tank and the secondary inductive coupling filter tank and the surface of the perforated baffle.

Preferably, cobblestones with the particle size of 2mm-10mm are paved on the porous phosphorus removal filler in the primary inductive coupling filter tank, and quartz sand with the particle size of 0.8mm-1.5mm is paved on the porous phosphorus removal filler in the secondary inductive coupling filter tank.

Above-mentioned scheme is preferred, is being close the bottom of sedimentation tank is provided with drain and dive sludge reflux pump, the output of this dive sludge reflux pump pass through the back flow with the bottom intercommunication in oxygen deficiency pond.

Preferably, the thickness of the porous phosphorus removal filler in the secondary inductive coupling filter is more than 1.5 times that of the porous phosphorus removal filler in the primary inductive coupling filter.

Preferably, the volume ratio of the anoxic tank to the aerobic tank is 1: 2-1: 4.

In summary, due to the adoption of the technical scheme, the utility model has the following technical effects:

(1) the electrode matrix of the utility model generates oxidation reduction action to lead various indexes of effluent to be better than that of the common biological aerated filter, substances with stronger oxidability and reducibility are generated on the electrodes in the coupling filter under the action of an external power supply, the substances remove pollutants in water through oxidation reduction action, the pollutants in water can be better degraded through direct oxidation and indirect oxidation action, and simultaneously oxygen and hydrogen generated by micro-electrolysis have promotion function on cell growth and activity of microorganisms.

(2) The aeration pipe is arranged at the bottom of the anoxic tank to prevent the filler from being excessively adhered by microorganisms to lose the adsorption effect, and the aeration mode can be intermittently started to carry out back flushing on the filler in the anoxic tank so as to maintain the optimal adsorption performance of the filler.

(3) The bottom of the inductive coupling filter tank is provided with a perforated baffle plate with the aperture of 10-20mm, and an aeration branch pipeline is arranged below the perforated baffle plate, so that suspended matters in sewage are adsorbed by the surface of a filter material and are continuously accumulated in the filter material layer in the filtering process, the pores of the filter layer are gradually blocked by sewage, the aeration can play a back flushing role, the filter tank can recover the working performance, and the adsorption performance of the filter material layer is recovered.

(4) The utility model adopts the modular design, and occupies a small area; the operation is stable, the operation and maintenance management is simple and convenient, the energy consumption is low, and the operation cost is low; the system can automatically run without the management of a specially-assigned person; the method has wide application range, is suitable for the on-site treatment and recycling of dispersed rural domestic sewage, tourist attraction sewage, landscape water, lake water and the like with small water quantity and large change of water quality and quantity, has simple and convenient process treatment, can stably run for a long time while meeting the discharge requirement, effectively solves the treatment problem of rural sewage in China, and has good application prospect.

Drawings

FIG. 1 is a schematic structural diagram of a sewage treatment system based on an AO-MBBR-inductively coupled filter according to the present invention;

1-an anoxic tank, 2-an aerobic tank, 3-a sedimentation tank, 4-a first aeration branch pipe, 4 a-a first gas guide branch pipe, 4 b-a first air check valve, 5-a blower, 6-a submersible sludge reflux pump, 7-a combined filler, 8-a porous phosphorus removal filler, 9-MBBR filler, 10-a primary inductively coupled filter tank, 11-a secondary inductively coupled filter tank, 12-a triangular weir water outlet, 12 a-a water outlet tank, 13-a second aeration branch pipe, 13 a-a second gas guide branch pipe, 14-a perforated baffle, 15-an aeration main pipe, 16-a second air check valve, 17-a sewage discharge outlet, 18-an electrode matrix, 19-a constant-voltage direct current power supply, 20-quartz sand, 21-cobblestones, and 30-a water through hole, 31-L-shaped delivery pipe, 40-aeration disc and 60-return pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

As shown in fig. 1, the sewage treatment system based on the AO-MBBR-inductively coupled filter provided by the present invention comprises an anoxic tank 1, an aerobic tank 2, a sedimentation tank 3, a constant voltage dc power supply 19 and one or more inductively coupled filters; the bottom of the anoxic tank 1 is communicated with the bottom of the aerobic tank 2, the top side wall of the aerobic tank 2 is communicated with the sedimentation tank 3, the top side wall of the sedimentation tank 3 is communicated with the inductively coupled filter tank, an electrode matrix 18 is distributed in the inductively coupled filter tank, a constant-voltage direct-current power supply 19 is electrically connected with the electrode matrix, a second aeration branch pipeline 13 is arranged at the bottom of the inductively coupled filter tank, a perforated baffle plate 14 is horizontally arranged in the inductively coupled filter tank close to the upper part of the second aeration branch pipeline 13, and an aeration main pipe 15 which is communicated with each other is arranged among the inductively coupled filter tank, the anoxic tank 1 and the aerobic tank 2; the bottom in the anoxic tank 1 and the bottom in the aerobic tank 2 are respectively provided with a first aeration branch pipeline 4, aeration discs 40 are uniformly distributed on the first aeration branch pipelines 4, the first aeration branch pipelines 4 in the anoxic tank 1 and the aerobic tank 2 are respectively communicated with the aeration main pipe 15 through a first air guide branch pipe 4a, the aeration main pipe 15 is provided with an air blower 5, the first air guide branch pipe 4a is provided with a first air check valve 4b, the aeration pipes of the anoxic tank 1 are subjected to aeration back flushing through the first air guide branch pipe 4a, and aeration can achieve the back flushing effect on the filler; the volume of the anoxic tank 1 is smaller than that of the aerobic tank 2, the volume ratio of the anoxic tank 1 to the aerobic tank 2 is 1: 2-1: 4, the ratio of the volume to the volume is preferably 1:3, the aeration main pipe 15 aerates the aerobic tank 2 for a long time through the first air guide branch pipe 4a, combined fillers 7 and MBBR fillers 9 are respectively arranged in the anoxic tank 1 and the aerobic tank 2 and positioned above the first aeration branch pipe 4, a sewage discharge port 17 and a submersible sludge reflux pump 6 are arranged at the bottom close to the sedimentation tank 3, and the output end of the submersible sludge reflux pump 6 is communicated with the bottom of the anoxic tank 1 through a reflux pipe 60; the combined filler 7 is composed of hydroformylation fibers, has large specific surface area, is not blocked, is quick to form a film, mainly provides a carrier for microorganisms, and has the structure that a plastic wafer is pressed and buckled into a double-ring large plastic ring, and the hydroformylation fibers or polyester yarns are pressed on the ring of the ring to ensure that fiber bundles are uniformly distributed; the inner ring is provided with the snowflake-shaped plastic branches, so that the combined filler can be used for hanging a film, can effectively cut bubbles, improves the transfer rate and the utilization rate of oxygen, enables a water-gas biomembrane to be fully exchanged, enables organic matters in water to be efficiently treated, has an explanation effect on pollutants in the sewage due to the fact that the sewage can be bred in the anoxic pond 1 and the aerobic pond 2, has a certain adsorption effect on the pollutants in the domestic sewage due to the combined filler 7, has a biodegradation effect on the organic matters due to the microorganisms growing on the surface of the combined filler 7 in a film-hanging manner, and can reach a BOD (biochemical oxygen demand) and COD (chemical oxygen demand) removal rate of a water body of more than 60-70%; the sewage enters the anoxic tank 1 and the aerobic tank 2 in sequence to contact with the MBBR filler 9; the combined filler 7 in the anoxic tank 1 and the MBBR filler 9 are fixed with denitrifying bacteria, short-range denitrifying bacteria, anaerobic ammonium oxidation bacteria and the like, part of ammonia nitrogen in raw water and nitrite and nitrate in reflux liquid in the sedimentation tank 2 are reduced into nitrogen under the combined action, microbial flora rapidly grows and breeds in the anoxic tank 1 and active sludge, pollutants in sewage are intercepted and adsorbed by a biological membrane and the active sludge and are used as nutrient sources of microorganisms, and the pollutants are digested in the growth and breeding processes of the microorganisms, so that the sewage is primarily degraded; then sewage flows into the aerobic tank 2 through the side wall at the bottom of the anoxic tank 1 for purification and restoration, an aeration main pipe 15 in the aerobic tank 2 is needed to carry out long-time aeration on the aerobic tank 2 through a first gas guide branch pipe 4a and a first air check valve 4b, suspended microbial carriers in a fluidized state tumble in the aerobic tank 2 in a disordered state during aeration, the fluidized state of MBBR fillers 9 is maintained, the sewage is contacted with active microbial carriers (MBBR fillers) flowing in the aeration, ammonia nitrogen in the water in the aerobic tank 1 is oxidized into nitrite under the action of microorganisms, meanwhile, a dissolved oxygen gradient is gradually formed on the surfaces of the combined fillers 7 and the MBBR fillers 9 and a biological film formed in the surface of the combined fillers and the MBBR fillers, an aerobic area is formed on the surfaces of the fillers and the biological film, and an anoxic area or an anaerobic area is formed in the interior of the fillers and the aerobic tank can realize synchronous nitrification in the same biological film system, Denitrification is carried out, and high-efficiency denitrification is realized; the phosphorus-accumulating bacteria can absorb the phosphorus in the water excessively to enter the bacteria in an amount exceeding the metabolism requirement of the phosphorus-accumulating bacteria under the aerobic condition, and the phosphorus removal effect is finally achieved.

In the utility model, as shown in fig. 1, a water passing hole 30 is arranged on the side wall of the top end of the aerobic tank 2, an L-shaped conveying pipe 31 communicated with the water passing hole 30 is arranged in the sedimentation tank 3, the upper end of the conveying pipe 31 is connected to the water outlet side of the water passing hole 30, the other end of the L-shaped conveying pipe 31 extends downwards to be close to the upper part of the bottom of the sedimentation tank 3, domestic sewage is treated in the aerobic tank 2 and then flows into the sedimentation tank 3 through the water passing hole 30 on the side wall of the top end of the aerobic tank 2 and the L-shaped conveying pipe 31, a triangular weir water outlet 12 is arranged on the side wall of the top end of the sedimentation tank 3 at the opposite side of the water passing hole 30, the side wall of the top end of the sedimentation tank 3 is communicated with the side wall of the top end of the inductively coupled filter tank through the triangular weir water outlet 12, the sewage flowing out from the aerobic tank automatically flows into the sedimentation tank 3 to be separated from mud and water to remove a large amount of particulate matters and organic matters, supernatant is formed at the upper part in the sedimentation tank 3, the supernatant automatically flows into the inductive coupling filter tank after being deposited by a triangular weir water outlet 12, one part of the muddy water mixed liquid in the sedimentation tank 3 flows back the nitrite generated in the sedimentation tank 3 to the anoxic tank 1 through the sludge reflux pump 6 for denitrification, and the other part of the muddy water mixed liquid is discharged through a sewage outlet 17.

In the utility model, as shown in fig. 1, the inductively coupled filter comprises a first-stage inductively coupled filter 10 and a second-stage inductively coupled filter 11, the first-stage inductively coupled filter 10 and the second-stage inductively coupled filter 11 are composed of two stages, a water outlet tank 12a is arranged on the top side wall of the second-stage inductively coupled filter 11 far from the first-stage inductively coupled filter 10, the top side wall of the sedimentation tank 3 is communicated with the top side wall of the first-stage inductively coupled filter 10 through a triangular weir water outlet 12, the bottom of the first-stage inductively coupled filter 10 is communicated with the bottom of the second-stage inductively coupled filter 11, the perforated baffle 14 horizontally penetrates through the upper part of the bottom of the first-stage inductively coupled filter 10 and the upper part of the second-stage inductively coupled filter 11 respectively, one end of the perforated baffle 14 is connected to the side wall of the first-stage inductively coupled filter 10 at the triangular weir water outlet 12, the other end of the perforated baffle 14 is connected to the side wall of the second-stage inductively coupled filter 11 at the water outlet tank 12a side, the second aeration branch pipe 13 is horizontally arranged at the bottom of the primary inductively coupled filter 10 and the bottom of the secondary inductively coupled filter 11 below the perforated baffle 14, a second air guide branch pipe 13a which extends downwards from the top end of the primary inductively coupled filter 10 to the bottom end and is communicated with the second aeration branch pipe 13 is arranged at one side close to the water outlet 12 of the triangular weir, the second air guide branch pipe is communicated with the main aeration pipe 15, the electrode matrixes 18 are respectively distributed in the primary inductively coupled filter 10 and the secondary inductively coupled filter 11, and a second air check valve 16 is arranged on the second air guide branch pipe 13 a; the electrode matrix 18 is a columnar electrode, porous phosphorus removal fillers 8 with the particle size of 10mm-30mm are respectively paved in the primary inductively coupled filter 10 and the secondary inductively coupled filter 11 and between the positions below the level of the water outlet 12 of the triangular weir and the surface of the perforated baffle 14, the porous phosphorus removal fillers are formed by taking fly ash, gypsum, phosphogypsum, cement, quicklime and the like as raw materials through high-temperature steam, and the phosphorus removal fillers contain a large amount of uniform and fine pores and have the characteristics of light volume weight, good mechanical strength, developed pores, easy film formation, strong phosphorus adsorption and the like; cobblestones 21 with the particle size of 2mm-10mm are paved on the porous phosphorus removal filler 8 in the primary inductively coupled filter 10, quartz sand 20 with the particle size of 0.8mm-1.5mm is paved on the porous phosphorus removal filler 8 in the secondary inductively coupled filter 11, the volume ratio of the cobblestones 21 and the porous phosphorus removal filler 8 in the primary inductively coupled filter 10 is 2:1, the volume ratio of the quartz sand 20 and the porous phosphorus removal filler 8 in the secondary inductively coupled filter 11 is 1:1, the thickness (height) of the porous phosphorus removal filler 8 in the secondary inductively coupled filter 11 is more than 1.5 times of the thickness of the porous phosphorus removal filler 8 in the primary inductively coupled filter 10, so that the purification flow of sewage flowing through the porous phosphorus removal filler 8 in the secondary inductively coupled filter 11 is more than the flow flowing through the primary inductively coupled filter 10, and the sewage is more fully purified, the porous phosphorus removal filler 8 is prepared from fly ash, gypsum, phosphogypsum, cement, quicklime, zirconium dioxide and water according to the following mass ratio: mixing the raw materials at a ratio of 70:15:5:8:25:15:10, stirring to form slurry, filling and pouring the slurry into a mold, standing for 2-3 hours, introducing 100-150 ℃ high-temperature water vapor to heat the filled and poured slurry, heating for 2-3 hours, gradually cooling, taking out, uniformly cutting into 10-30 mm particles, curing for 1-3 days under 60-80 ℃ steam heating condition to form uniform and fine-pore dephosphorization filler, and finally demolding to obtain a dephosphorization block; the porous phosphorus removal filler 8 is prepared from fly ash, gypsum, phosphogypsum, cement, quicklime and zirconia as raw materials by high-temperature steam, and has the characteristics of light volume weight, good mechanical strength, developed pores, easiness in film formation, strong phosphorus adsorption and the like.

In the utility model, as shown in fig. 1, columnar electrodes are arranged in a primary inductively coupled filter 10 and a secondary inductively coupled filter 11 to form an electrode matrix, the electrode material can be iron, aluminum, graphite or titanium-based coating and other conductive materials, an external constant voltage direct current power supply 19 is connected with the electrodes through a lead, the size of the aperture of the perforated baffle 14 is 5mm-8mm, the perforated baffle is mainly used for supporting porous phosphorus removal filler 8 and filtering sewage, the porous phosphorus removal filler 8 is prevented from falling to the bottoms of the primary inductively coupled filter 10 and the secondary inductively coupled filter 11 to block a water flow channel, the sewage passes through cobblestones 21 and the porous phosphorus removal filler 8 in the primary inductively coupled filter 10, then passes through the water flow channel between the perforated baffle 14 and the portion of the primary inductively coupled filter 10 and between the perforated baffle 14 and the bottom of the secondary inductively coupled filter 11, under the aeration action of the second aeration branch pipe 13, the sewage is accelerated to remove suspended matters and solid impurities in the water from the bottom of the secondary inductive coupling filter 11 through the porous dephosphorization filler 8 and the quartz sand 20, and finally flows out of the water outlet groove 12 a. In the utility model, as shown in figure 1, after supernatant sewage in a sedimentation tank 3 enters a primary inductive coupling filter tank 10 through a triangular weir water outlet 12, the supernatant sewage passes through cobblestone 21 packing with larger particle size from top to bottom and then passes through a porous phosphorus removal packing 8 with smaller particle size, pollutants are adsorbed on the packing, under the action of an external electric field of an electrode matrix 18, three-dimensional electrolysis is formed, and organic matters, nitrogen and phosphorus are removed under the combined action of the packing, micro-electrolysis and microorganisms; the sewage treated by the primary inductive coupling filter 10 enters the secondary inductive coupling filter 11 from the bottom, the sewage passes through the porous phosphorus removal filler 8 and the quartz sand 20 from bottom to top, the residual pollutants are adsorbed on the filler, three-dimensional electrolysis is formed under the action of an external electric field of the electrode matrix 18, and organic matters, nitrogen and phosphorus are further removed under the combined action of the filler, micro-electrolysis and microorganisms; in the utility model, the removal of organic matters in the domestic sewage mainly depends on the biological contact oxidation process at the front section and the electrolytic oxidation at the rear section; the removal of the total phosphorus mainly depends on the adsorption effect, the biological effect and the electrochemical precipitation effect of the porous filler; the total nitrogen removal mainly depends on biological denitrification and an inductive coupling filter tank technology; the inductively coupled filter technology makes the pollutant obtain the degradation under biological and electrochemistry dual action, both combine together and can form lower ORP (oxidation reduction potential) at the negative pole and promote autotrophic denitrifying bacteria's growth and denitrification, reduce nitrate nitrogen to nitrogen gas, the positive pole is different according to electrode material, different electrochemical reaction can take place, thereby effect such as production electroflocculation, electrocatalytic oxidation, the microorganism fixed growth and the higher redox ability of electrolysis through fully having combined the biomembrane, and technical advantage such as high-efficient mass transfer relation between the two, can effectual processing pollutant.

In the present invention, the process of sewage treatment by the sewage treatment system based on the AO-MBBR-inductively coupled filter of the present invention is further explained with reference to FIG. 1: firstly, domestic sewage is treated by a grid and then is sequentially sent into an anoxic tank 1 and an aerobic tank 2 to be treated by microorganisms, and the steps are as follows: domestic sewage is treated by a grid and is sent into an anoxic tank 1, a combined filler 7 and an MBBR filler 9 are respectively added into the anoxic tank 1 and an aerobic tank 2, and denitrifying bacteria are fixed on the MBBR filler 9 in the anoxic tank 1, so that the domestic sewage is subjected to short-range anaerobic denitrification reaction in the anoxic tank 1; part of ammonia nitrogen in the raw water, nitrite and nitrate in the reflux liquid in the sedimentation tank 2 are reduced into nitrogen under the combined action of denitrifying bacteria, anaerobic ammonium oxidation bacteria and the like, microbial flora rapidly grows and breeds in the anoxic tank 3 and the activated sludge, pollutants in the sewage are intercepted and adsorbed by a biological membrane and the activated sludge and are used as nutrient sources of microorganisms, and the pollutants are digested in the growth and breeding process of the microorganisms, so that the sewage is primarily degraded; domestic sewage subjected to denitrification reaction enters the aerobic tank 2 from the side wall of the lower end of the anoxic tank 1, and a first aeration branch pipeline 4 is arranged at the bottom of the aerobic tank 2 to maintain the MBBR filler 9 in the aerobic tank 2 in a fluidized state; oxygen generated during aeration of the first aeration branch pipe 4 is fully contacted with the domestic sewage, the combined filler 7 and the MBBR filler 9, a biological film is formed on the surfaces of the combined filler 7 and the MBBR filler 9 and in the combined filler 7 and the MBBR filler 9, a dissolved oxygen gradient is gradually formed from the surface of the combined filler 7 and the surface of the MBBR filler 9 to the inside, the pollutants are promoted to perform oxidation reaction under the action of microorganisms in the aerobic tank 2, aerobic zones are formed on the surfaces of the combined filler 7, the surface of the MBBR filler 9 and the surface of the biological film, and an anoxic zone or an anaerobic zone is formed in the aerobic zones, so that the pollutants in the domestic sewage are subjected to synchronous nitrification reaction and denitrification reaction; secondly, the domestic sewage treated by the microorganisms enters a sedimentation tank 3 for sludge sedimentation to realize sludge-water separation, and the sedimentated sludge flows back to the anoxic tank 1 to further remove suspended matters in the water body; finally, supernatant formed after domestic sewage is precipitated in the precipitation tank 3 enters the inductive coupling filter through a water outlet 12 of the triangular weir, the flow speed of the supernatant in the inductive coupling filter is accelerated under the action of applying voltage on an electrode matrix 18 by using a constant-voltage direct-current power supply 19 to perform micro-electrolysis and aeration of a second aeration branch pipeline 13, so that the supernatant firstly passes through a cobblestone filler 21 and a porous phosphorus removal filler 8 from top to bottom in the inductive coupling filter to adsorb pollutants and the electrode matrix 18 performs micro-electrolysis, part of organic matters, nitrogen and phosphorus are firstly removed, and then the supernatant passes through the electrode matrix 18 again to perform micro-electrolysis, the porous phosphorus removal filler 8 and quartz sand 20 from bottom to top to adsorb the pollutants, thereby further removing organic matters, nitrogen and phosphorus in the supernatant sewage under the combined action of the filler-micro-electrolysis-microorganism; after entering the primary inductive coupling filter 10 through the water distribution tank 12, the supernatant passes through cobblestone 21 packing with larger particle size from top to bottom in the primary inductive coupling filter 10, then passes through porous phosphorus removal packing 8 with smaller particle size, and adsorbs pollutants in the supernatant sewage and removes organic matters, nitrogen and phosphorus pollutants in the supernatant sewage under the action of three-dimensional electrolysis formed under the action of an external electric field of the electrode matrix 18 and aeration through the second aeration branch pipeline 13; the supernatant sewage treated by the primary inductive coupling filter 10 enters the secondary inductive coupling filter 11 from the bottom, flows from bottom to top in the secondary inductive coupling filter 11, sequentially passes through the porous phosphorus removal filler 8 and the quartz sand 20, and forms three-dimensional electrolysis under the action of an external electric field of the electrode matrix 18, so that the residual pollutants in the supernatant sewage are fully contacted with the porous phosphorus removal filler 8 and the quartz sand 20, and the pollutants in the supernatant sewage are adsorbed and micro-electrolyzed, thereby further removing organic matters, nitrogen and phosphorus pollutants in the supernatant sewage.

In the utility model, in order to verify the treatment effect of the treatment system, the treatment system is used in a rural sewage treatment station in a certain village, sewage is subjected to grid filtration and larger suspended matters are lifted to the integrated AO-MBBR-inductively coupled filter system for treatment by a lift pump, and then is precipitated to obtain water by a secondary sedimentation tank, wherein the electrode material is iron as an anode, graphite as a cathode, and the water inflow is 30m³D, adjusting and aerating the system, wherein the effluent quality result during normal operation is shown in table 1, and the effluent NH is₃N, SS and TP all reach the first class A standard of pollutant discharge Standard of urban Sewage treatment plant (GB18918-2002), COD of the effluent reaches the first class B standard, and the treated effluent is used as farmland irrigation water.

TABLE 1 Water quality index content (unit mg/L)

Index (I)	COD	NH₃-N	SS	TP
					Quality of inlet water	240	60.00	180	2.80
Quality of effluent water	58.89	2.54	8.60	0.27
					Removal rate	75.5％	95.8％	95.2％	90.4％
First class A Standard	50.00	5.00	10.00	0.50
					Surface water IV type standard	30	1.5	—	0.3

As can be seen from Table 1, the utility model provides a distributed domestic sewage treatment system and treatment process for an AO-MBBR-inductively coupled filter based on the difficulties of small sewage treatment amount, large water quality and water volume change, difficult centralized treatment and the like in the rural domestic sewage treatment at the present stage, can simultaneously remove nitrogen, phosphorus and organic matters, and combines AO, MBBR and inductively coupled filter technologies by the process and the system, adopts a modular construction technology, and flexibly combines the AO, MBBR and inductively coupled filter technologies according to the requirement of the treated water volume; the AO-MBBR-inductively coupled filter treatment system has high treatment efficiency and good effect on pollutants in sewage; for domestic sewage, the indexes of removing water organic matters, nitrogen and phosphorus by combined process treatment can reach the first-level B standard and above in the pollutant discharge standard of municipal wastewater treatment plant (GB18918-2002), so that the discharge requirement is met, the system can stably run for a long time, the operation and maintenance management of the system is simple and convenient, the energy consumption is low, and the system is suitable for the on-site treatment and recycling of water quality such as distributed rural domestic sewage, tourist attraction sewage, landscape water, lake water and the like with small water quantity and large water quality and water quantity change, and has good application prospect.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims

1. A sewage treatment system based on AO-MBBR-inductively coupled filter, its characterized in that: the sewage treatment system comprises an anoxic tank (1), an aerobic tank (2), a sedimentation tank (3), a constant-voltage direct-current power supply (19) and one-stage or multi-stage inductively coupled filter tanks; the bottom in oxygen deficiency pond (1) and the bottom in good oxygen pond (2) communicate each other, the top lateral wall and the sedimentation tank (3) intercommunication in good oxygen pond (2), the top lateral wall of sedimentation tank (3) with inductively coupled filtering pond intercommunication has laid electrode matrix (18) in the inductively coupled filtering pond, constant voltage DC power supply (19) and electrode matrix electrical connection are equipped with second aeration pipeline (13) in the bottom in inductively coupled filtering pond, and the level is provided with perforation baffle (14) in the inductively coupled filtering pond that is close second aeration pipeline (13) top, be provided with the aeration person in charge (15) of mutual intercommunication between inductively coupled filtering pond and oxygen deficiency pond (1) and good oxygen pond (2).

2. The AO-MBBR-inductively coupled filter-based sewage treatment system of claim 1, wherein: a first aeration branch pipe (4) is respectively arranged at the bottom in the anoxic tank (1) and the bottom in the aerobic tank (2), aeration discs (40) are uniformly distributed on the first aeration branch pipe (4), the first aeration branch pipes (4) in the anoxic tank (1) and the aerobic tank (2) are respectively communicated with the aeration main pipe (15) through first air guide branch pipes (4a), an air blower (5) is arranged on the aeration main pipe (15), a combined filler (7) and an MBBR filler (9) are respectively arranged in the anoxic tank (1) and the aerobic tank (2) and positioned on the first aeration branch pipes (4), a first air check valve (4b) is arranged on the first air guide branch pipe (4a), a water through hole (30) is arranged on the top side wall of the aerobic tank (2), and an L-shaped conveying pipe (31) communicated with the water through hole (30) is arranged in the sedimentation tank (3), the upper end of this L shape conveyer pipe (31) is connected in the play water one side of crossing water hole (30), the other end downwardly extending of L shape conveyer pipe (31) is close the bottom top of sedimentation tank (3), is provided with triangle weir delivery port (12) at the top lateral wall of sedimentation tank (3) of crossing the relative one side of water hole (30), the top lateral wall of sedimentation tank (3) pass through triangle weir delivery port (12) with the top lateral wall intercommunication of inductive coupling filtering pond.

3. The AO-MBBR-inductively coupled filter-based sewage treatment system of claim 2, wherein: the inductive coupling filter tank comprises a first-stage inductive coupling filter tank (10) and a second-stage inductive coupling filter tank (11) which are composed of two stages of filter tanks, wherein a water outlet groove (12a) is formed in the top side wall of the second-stage inductive coupling filter tank (11) far away from one side of the first-stage inductive coupling filter tank (10), the top side wall of the sedimentation tank (3) is communicated with the top side wall of the first-stage inductive coupling filter tank (10) through a triangular weir water outlet (12), the bottom of the first-stage inductive coupling filter tank (10) is communicated with the bottom of the second-stage inductive coupling filter tank (11), a perforation baffle (14) horizontally penetrates through the upper part of the bottom of the first-stage inductive coupling filter tank (10) and the upper part of the second-stage inductive coupling filter tank (11), one end of the perforation baffle (14) is connected to the side wall of the first-stage inductive coupling filter tank (10) on one side of the triangular weir water outlet (12), the other end of the perforated baffle plate (14) is connected to the side wall of the second-stage inductively coupled filter (11) on one side of the water outlet tank (12a), the second aeration branch pipe (13) is horizontally arranged at the bottom of the first-stage inductively coupled filter (10) below the perforated baffle plate (14) and the bottom of the second-stage inductively coupled filter (11), a second air guide branch pipe (13a) and an aeration main pipe (15) which are communicated with the bottom end and the second aeration branch pipe (13) are arranged on one side of the water outlet (12) close to the triangular weir, the top end of the first-stage inductively coupled filter (10) extends downwards, the electrode matrix (18) is respectively arranged in the first-stage inductively coupled filter (10) and the second-stage inductively coupled filter (11), and a second air check valve (16) is arranged on the second air guide branch pipe (13 a).

4. A sewage treatment system based on AO-MBBR-inductively coupled filter according to claim 1 or 3 wherein: the electrode matrix (18) is an electrode array formed by columnar electrodes at intervals.

5. The AO-MBBR-inductively coupled filter-based sewage treatment system of claim 3, wherein: porous phosphorus removal fillers (8) with the particle size of 10mm-30mm are respectively paved in the primary inductive coupling filter tank (10) and the secondary inductive coupling filter tank (11) between the position below the level of the water outlet (12) of the triangular weir and the surface of the perforated baffle (14).

6. The AO-MBBR-inductively coupled filter-based sewage treatment system of claim 5, wherein: cobblestones (21) with the particle size of 2mm-10mm are paved in the primary inductive coupling filter (10) and on the porous phosphorus removal filler (8), and quartz sand (20) with the particle size of 0.8mm-1.5mm is paved in the secondary inductive coupling filter (11) and on the porous phosphorus removal filler (8).

7. A sewage treatment system based on AO-MBBR-inductively coupled filter according to claim 1 or 2 or 3 wherein: the bottom that is being close sedimentation tank (3) is provided with drain (17) and dive sludge reflux pump (6), the output of this dive sludge reflux pump (6) pass through back flow (60) with the bottom intercommunication in oxygen deficiency pond (1).

8. The AO-MBBR-inductively coupled filter-based sewage treatment system of claim 5, wherein: the thickness of the porous phosphorus removal filler (8) in the secondary inductive coupling filter (11) is more than 1.5 times larger than that of the porous phosphorus removal filler (8) in the primary inductive coupling filter (10).

9. A sewage treatment system based on AO-MBBR-inductively coupled filter according to claim 1 or 2, characterized in that: the volume ratio of the anoxic tank (1) to the aerobic tank (2) is 1: 2-1: 4.