Sewage treatment system

Abstract

The invention discloses a sewage treatment system which is composed of a grating pretreatment unit, an oil separation tank, a high-speed air flotation machine, a coagulation primary sedimentation tank, a hydrolytic acidification and anoxic tank, a screening nano bubble generator, a contact oxidation and aerobic tank of microbial filler, a microbial preparation coagulation sedimentation unit, a sludge treatment unit, a sulfur-autotrophic phosphorus and nitrogen removal unit, an ultraviolet disinfection unit and the like. The air dissolving efficiency of the micro-charge high-speed air flotation machine is as high as 95-99%, the equipment volume is only 1 / 5 of that of traditional equipment, and the decontamination and separation effects are good; the water outlet and air outlet amount of the screening nano bubble generator is 10 times larger than that of a conventional nano aerator, ionized water, small molecular group water and magnetized water are generated in a combined mode, so that charges are carried, the solubility and the permeability are high, microorganisms are activated, the biochemical rate is increased, pollutants are effectively removed, sludge is degraded, and the sludge yield is reduced. The coagulation of the microbial preparation enables the inclined tube precipitation effect to be better, and the sulfur autotrophic technology and the efficient denitrification of the denitrification filter material solve the problems of insufficient carbon sources and denitrification, so that the sewage treatment constantly reaches the standard.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and specifically to a comprehensive sewage treatment system integrating advanced technologies such as an automatic grille, multi-stage oil-water separation, high-speed air flotation purification, coagulation primary sedimentation and hydrolysis acidification by microbial agents, a sieve micro-nano bubble generator, a suspension ball biological contact oxidation tank with the functions of ion equipment and magnetic equipment, microbial contact oxidation and aerobic tank, coagulation precipitation of microbial agents and sludge treatment, sulfur autotrophic deep denitrification, and ultraviolet disinfection. The purpose is to efficiently remove various pollutants in water bodies and achieve the up-to-standard discharge of water quality. Background Art

[0002] With the acceleration of the industrialization process and the improvement of the urbanization level, sewage treatment has become an important topic in environmental protection. Traditional sewage treatment methods are difficult to meet the increasingly strict treatment requirements, and there are problems such as low treatment efficiency, high energy consumption, and large floor area in terms of technology. Therefore, it is particularly important to develop a sewage treatment system integrating multiple efficient treatment technologies. Summary of the Invention

[0003] The purpose of the present invention is to provide a sewage treatment system, which realizes the efficient purification treatment of sewage through the coordinated action of multiple functional devices and multiple treatment processes, and improves the effects of each other in terms of function and technology.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A sewage treatment system, which is a comprehensive sewage treatment system integrating advanced technologies such as a grille pretreatment unit, an oil separation tank unit, a coagulation primary sedimentation tank by microbial agents, a hydrolysis acidification and collection tank unit, a high-speed air flotation machine purification unit, an anoxic tank, a sieve nano-bubble generator, a suspension ball microbial filler contact oxidation and aerobic tank unit, a coagulation inclined tube sedimentation tank (secondary sedimentation tank) by adding microbial agents, a sulfur autotrophic denitrification filter material and anti-digestion unit, and a disinfection and automatic monitoring unit;

[0006] The grille pretreatment unit includes a sewage drainage ditch and an automatic grille machine, which are used to remove large garbage, meat foam, residues and impurities in the water body, so that the sewage to be treated later contains fewer impurities;

[0007] The oil separation tank unit is provided with a three-stage oil separation tank, with water passing through vertical straight pipes, entering from the bottom, and the straight pipes leading the water to the surface to connect to a positive tee, and then flowing horizontally to another oil separation tank for convenient pipeline cleaning. The three-stage oil separation tank effectively separates and removes floating oil and suspended matter in the sewage through gravity sedimentation and physical blockage;

[0008] The described high-speed air flotation machine purification unit (the air flotation machine is omitted for domestic sewage) uses the micro-charge high-speed air flotation separation technology and combines the new jet cutting dissolved air technology of the high-speed air flotation machine to generate stable and efficient micro-bubbles, effectively removing suspended solids, organic matter, and residual oil particles;

[0009] The described microbial agent coagulation primary sedimentation and hydrolysis acidification unit uses co-precipitation microbial agents to precipitate and remove suspended solids and organic pollutants, and through the hydrolysis acidification process, using the action of microorganisms, converts complex non-dissolved polymers in the water body into simple dissolved monomers, promoting the subsequent biodegradation process;

[0010] The described anoxic tank provides an anoxic environment for the sewage, enabling denitrifying bacteria to carry out denitrification reactions under such conditions. The dissolved oxygen concentration in the anoxic tank is usually controlled between 0.2 - 0.5 mg / l. In this environment, denitrifying bacteria use the undegraded carbon-containing organic matter in the sewage as a carbon source to reduce the nitrate returned through the internal circulation from the aerobic tank to N2 and release it, playing a role in the denitrification process, removing nitrate nitrogen through denitrification, and also removing part of the BOD5. And through the action of hydrolysis reactions, the biodegradability of the sewage is improved. Through the treatment of the anoxic tank, the organic matter content in the sewage can be effectively reduced, and the efficiency of subsequent biological treatment can be enhanced.

[0011] The described molecular sieve micro-nano bubble generator introduces air or oxygen into the micro-nano generator. The gas is adsorbed in the micropores through the molecular sieve, and gas separation and purification are achieved within the micropores of the molecular sieve. Gas molecules interact to form bubbles and are released from the molecular sieve, forming nano-bubble oxygenation;

[0012] The described suspension ball microbial filler and filter material contact oxidation unit with the functions of ion equipment (ion concentration > 200 million / cm 3 ) and magnetic equipment (8000 - 12000 gauss), through molecular sieve micro-nano aeration, small molecular cluster water generator, and magnetic equipment, promotes nitrification and denitrification reactions. Using microorganisms, continuous contact oxidation reactions occur during the full contact between the filler and the sewage. The nano-bubble stones on the surface generate oxygen for oxygenation in visible light, and a certain amount of muddy sewage containing mud is refluxed from the outer drainage of the sedimentation tank to the hydrolysis acidification anoxic tank at the front end of this tank for better denitrification and removal of organic pollution. The calculation method for the reflux volume is:

[0013] Qr = Q1 * f1 / Xi

[0014] Multiply the total sewage production Q1 at the current time by the sludge reflux ratio f1, and then divide by the sludge mass concentration Xi to obtain the reflux volume Qr;

[0015] The suspension ball packing and filter material aerobic tank unit with ion device and magnetic device functions enhances the contact between water body and packing through sieve micro-nano aeration, small molecule cluster water generator and magnetic device, and promotes oxidation, nitrification and denitrification reactions; the nano bubble stones on the surface layer generate oxygen for aeration in visible light. In addition to having good filtration and contact oxidation reaction effects, the suspension ball packing and filter material have a large specific surface area and are porous and loose, which are easily utilized by microorganisms, can provide necessary trace elements for the growth and reproduction of microorganisms, improve the biochemical rate, and effectively realize biodiversity at its activation sites, thus improving the denitrification efficiency;

[0016] In the microbial agent coagulation precipitation and sludge thickening, pressure filtration and drying unit, microbial agents are used for coagulation precipitation to remove pollutants, and inclined parallel tubes are used to improve the precipitation efficiency. The sludge treatment unit includes an inclined tube sedimentation tank, a plate and frame filter press, a sludge thickening tank and a drying tank. The concentrated sludge is separated from water and mud through the plate and frame filter press, and the mud blocks are dried in the drying tank and added with microorganisms to be used as organic fertilizers;

[0017] In the sulfur autotrophic and high-efficiency denitrification filter material unit, sulfur autotrophic bacteria will also continuously reproduce and grow, forming a complete growth and reproduction system to achieve the purpose of water purification and recycling; by using the metabolic action of sulfur autotrophic bacteria groups, the pollutants in water are converted into harmless or useful substances. The suspension ball packing and suspension ball denitrification filter material have a large specific surface area and are porous and loose, which are easily utilized by microorganisms, can provide necessary trace elements for the growth and reproduction of autotrophic microorganisms, improve the biochemical rate, effectively remove total nitrogen, and completely solve the problems of insufficient carbon source and denitrification in sewage treatment, with sustainability and environmental benefits;

[0018] In the disinfection and water quality automatic monitoring unit, the equipment is installed beside the pool body for convenient manual maintenance of the ultraviolet lamp. After ultraviolet lamp disinfection, in order to further ensure that the effluent water quality meets the standard constantly, a water quality automatic monitoring system is set at the external drainage outlet.

[0019] A process flow of a sewage treatment system includes the following specific steps:

[0020] S1: The water body to be treated first passes through an automatic grille to remove impurities such as garbage, meat foam and residues;

[0021] S2: The sewage undergoes oil-water separation and pollutant precipitation in a three-stage oil separation tank;

[0022] S3: The high-speed air flotation machine (the air flotation machine is omitted for domestic sewage) uses the technologies of high-speed air flotation separation with micro-charge and new jet cutting dissolved air, so that stable and efficient micro-bubbles can effectively carry away suspended solids and oil particles. The air flotation machine efficiently completes oil-water separation and removal of organic pollutants, making the water body reach the purification effect.

[0023] S4: The microbial agent aggregates pollutants to complete primary sedimentation and hydrolysis acidification in the anoxic tank. The pollutants are precipitated, and through the hydrolysis acidification process, complex and non-dissolved polymers in the water body are converted into simple dissolved monomers. Macromolecular organic matter is transformed into small-molecule substances through the action of extracellular enzymes of microorganisms. To better denitrify and remove organic pollutants, a certain amount of muddy sewage is refluxed from the effluent of the sedimentation tank to the hydrolysis acidification tank;

[0024] S5: The anoxic tank provides an anoxic environment for the sewage, enabling denitrifying bacteria to carry out denitrification reactions under such conditions. Through denitrification, nitrate nitrogen is removed, and at the same time, part of the BOD5 can also be removed, effectively reducing the organic matter content in the sewage and improving the efficiency of subsequent biological treatment.

[0025] S6 The sieve nano-bubble generator introduces air or oxygen into the micro-nano generator. The gas is adsorbed in the micropores through the molecular sieve, and gas separation and purification are achieved in the micropores of the molecular sieve. Gas molecules interact to form bubbles and are released from the molecular sieve, forming nano-bubble aeration. The suspension ball filler with ion equipment and magnetic equipment functions and the highly efficient denitrification filter material contact oxidation tank, through functional equipment including sieve micro-nano aeration, small-molecule cluster water generator and magnetic equipment, increase the contact between the water body and the filler, promote oxidation, nitrification and denitrification reactions. Using microorganisms in the full contact between the filler and the sewage, continuous contact oxidation reactions are carried out. The nano-bubble stones on the surface layer generate oxygen directly and naturally in visible light, effectively removing organic pollutants;

[0026] S7 The suspension ball microbial filler contact oxidation and the highly efficient denitrification filter material contact oxidation tank, through functional equipment including laser cavitation micro-nano aeration, small-molecule cluster water generator and magnetic equipment, increase the contact between the water body and the filler, promote oxidation, nitrification and denitrification reactions. Using microorganisms in the full contact between the filler and the sewage, continuous contact oxidation reactions are carried out. The nano-bubble stones on the surface layer generate oxygen directly and naturally in visible light, effectively removing organic pollutants;

[0027] S8 The suspension ball microbial filler contact oxidation aerobic tank, through the sieve nano-bubble generator, small-molecule cluster water generator and magnetic equipment, strengthens the contact between the water body and the filler, promotes nitrification and denitrification reactions. Multiple large-flow pumps with magnetized water and small-molecule cluster water continuously cross-transport the water body into the central suspension ball microbial filler contact oxidation filter box, making the water body circulate and contact the filler, and carrying out more sufficient contact oxidation reactions. Moreover, because the specific surface area of the filler and the filter material is large and it has the characteristics of being loose and porous, it is easily utilized by microorganisms, can provide necessary trace elements for the growth and reproduction of microorganisms, improve the biochemical rate, and its activation sites effectively achieve biodiversity and improve the sewage treatment effect;

[0028] S9 microbial preparation coagulation sedimentation tank and sludge concentration filter press drying unit, add microbial preparation as needed to make pollutants enter the sedimentation tank for more thorough separation, and use inclined parallel pipes to improve sedimentation efficiency and remove pollutants more thoroughly. The sludge treatment unit includes an inclined tube sedimentation tank plate and frame filter press, a sludge concentration tank, and a drying tank. After the sludge is concentrated, the plate and frame filter press is used to separate the mud and water. After the mud blocks are dried in the drying tank, microorganisms are added as organic fertilizers;

[0029] S10 autotrophic and high-efficiency denitrification filter material adopts the principle that sulfur autotrophic bacteria will continue to reproduce and grow, forming a complete growth and reproduction system to achieve the purpose of water purification and recycling; using the metabolism of sulfur autotrophic bacteria, pollutants in the water are converted into harmless or useful substances. Sulfur autotrophic high-efficiency denitrification filter material has a large specific surface area and is loose and porous, which is easily used by microorganisms. It can provide necessary trace elements for the growth and reproduction of autotrophic microorganisms, improve the biochemical rate, and effectively remove total nitrogen, solving the problem of insufficient carbon source and denitrification in sewage treatment. It is sustainable and environmentally friendly.

[0030] S11 automatic monitoring of poison and external drainage water quality, ultraviolet lamp disinfection lamps are installed on the upper layer and near the pool side, making it easier to manually replace and clean the lamps, and automatic water quality monitoring is set at the rear section of the clear water tank to ensure that the water meets the discharge standards.

[0031] Beneficial effects of the present invention:

[0032] (1) The problem of insufficient carbon source and denitrification in sewage has been solved. Sulfur autotrophic and high-efficiency denitrification filter materials use pyrite and other materials as filter fillers, and sulfur autotrophic denitrification technology is used to remove total nitrogen. The principle of this technology is to use reduced sulfur sources such as sodium sulfide (Na2S), sodium thiosulfate (Na2S2O3) and elemental sulfur (S) as electron donors, and CO 32 -, HCO3-, and CO2 are used as inorganic carbon sources to reduce NO3--N to N2 in anoxic environments; compared with other autotrophic denitrification technologies, the reduced sulfide used as an electron donor is cheap and easy to obtain, less affected by water quality, and easy to use; therefore, sulfur autotrophic denitrification and high-efficiency denitrification filter media technology has always been regarded as one of the best technologies to replace traditional heterotrophic denitrification technology in treating low C / N wastewater;

[0033] (2) Reduced sludge discharge. Using ionized water, magnetized water, and small-molecule cluster water to activate microorganisms, through multifunctional synergistic effects, comprehensively remove and efficiently purify various pollutants in sewage. Small-molecule cluster water and magnetized water change the molecular structure of water molecules, enhance the penetration ability of water molecules into sludge, make the sludge structure loose and easy to be carried away; through the predation of microorganisms, reduce the generation amount of sludge; this method utilizes the interaction between microorganisms, optimizes the microbial community structure, promotes the consumption of sludge by dominant microorganisms, so as to achieve the purpose of reducing the generation amount of sludge;

[0034] (3) Energy conservation and consumption reduction: Using ionized water, magnetized water, and small-molecule cluster water to activate microorganisms, improves the biochemical rate, and because the generated bubbles are tiny, provides sufficient oxygen for the organic matter degradation process. For the same domestic sewage treatment, with a daily treatment volume of 600 tons / day, the total power consumption of the conventional treatment method usually reaches 47 Kw / h, while the total power consumption of using this system is 21 Kw / h, saving 55% of energy, achieving high-efficiency energy conservation, reducing operating costs, and improving energy utilization efficiency;

[0035] (4) Strong ability to cope with pollution load shocks. When the pollution load suddenly increases by less than 30% compared with the original, as long as some dominant microorganisms are added to the packing and filter media, the treatment effect will be very good. When the water mass has a high concentration or the water volume suddenly increases, and the pollution load increases by more than 60% compared with the original, the microbial storage tank in front of the two sedimentation tanks can be activated, and dominant microbial agents can be added to achieve co-sedimentation, effectively removing more than 82% of suspended solids and organic pollutants, ensuring the constant compliance of sewage treatment;

[0036] (5) Small floor area: The system has a high degree of integration and a compact layout, effectively reducing the floor area (for example, when the treatment concentration and treatment water volume are the same, the volume of the conventional air flotation machine is 5 times larger than that of the high-speed air flotation machine of this system). All equipment is convenient to maintain: Each treatment unit is reasonably designed, easy to operate, and convenient for daily maintenance and repair;

[0037] The high-speed air flotation machine of this system uses micro-charge high-speed air flotation separation and adopts a new type of jet cutting dissolved air technology, making the dissolved air efficiency as high as 95% to 99%. The volume of the equipment is only one-fifth of that of a general air flotation machine. The diameter of micro-bubbles is reduced by 3 - 10 times, and the total contact area between micro-bubbles and water is increased by at least 100 times, efficiently achieving the purification effect of oil-water separation; The packing pool and aerobic pool use ultrasonic cavitation micro-nano aeration technology to make the packing and aerobic pool have sufficient oxygen content. The sewage uses a large-flow submersible pump to continuously pass the sewage through the 8000 - 12000 Gauss magnetic field line cutting channels of the small-molecule cluster water generator and the narrow gap of the rear-stage magnetic equipment, allowing small-molecule cluster water and magnetized water to flow back into the packing for contact oxidation reaction, by ion superposition (ion concentration > 200 million / cm 3)Generate microcharges, activate microorganisms and improve the biochemical rate, effectively remove pollutants. The nanometer stones on the surface release a large amount of oxygen under the action of visible light to achieve natural oxygenation. In the latter treatment stage, microbial agents are added to the sewage as needed and enter the inclined tube sedimentation tank for sedimentation. The treatment effect is more significant, and total nitrogen is effectively removed through sulfur autotrophy and suspended spherical denitrification filter media. After ultraviolet disinfection and passing the automatic water quality monitoring, it is discharged up to the standard. Brief Description of the Drawings

[0038] Figure 1 It is a structural diagram of a sewage treatment system of the present invention;

[0039] Figure 2 It is a plan view of aerobic biological contact oxidation treatment in the present invention;

[0040] Figure 3 It is a process flow diagram of a sewage treatment system of the present invention. Detailed Embodiments

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0042] In the description of the embodiments of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0043] In addition, if terms such as "horizontal", "vertical", "hanging" are used, it does not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0044] In the description of the embodiments of the present invention, "a plurality of" represents at least 2.

[0045] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", "linked" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Embodiment:

[0047] A sewage treatment system consists of a grille pretreatment unit, an oil separation tank unit, a high-speed air flotation machine purification unit, a microbial agent coagulation primary sedimentation tank and a hydrolysis acidification unit, a suspended ball microbial filler and a filter material contact oxidation unit, a sulfur autotrophic and denitrification filter material aerobic unit, a coagulation inclined tube sedimentation tank and disinfection unit, and an automatic monitoring unit;

[0048] The described grille pretreatment unit includes a sewage inlet ditch and an automatic grille machine, which are used to remove large garbage, meat foam, residues and impurities in the water body, so that the sewage for subsequent treatment contains less impurities;

[0049] The described oil separation tank unit is provided with a three-stage oil separation tank, which enters the water from the bottom of the vertical straight pipe, and the water is led to the surface layer and connected to a positive tee to flow horizontally to another grid for convenient pipeline cleaning. The three-stage oil separation tank effectively separates and removes the floating oil and suspended substances in the sewage through gravity sedimentation and physical blockage;

[0050] The described high-speed air flotation machine purification unit is that the high-speed air flotation machine uses the micro-charge high-speed air flotation separation technology and combines with the new jet cutting dissolved air technology to generate stable and efficient micro-bubbles, effectively removing suspended substances, organic matters and residual oil particles;

[0051] The described microbial agent coagulation primary sedimentation and hydrolysis acidification unit uses a coprecipitation microbial agent to precipitate and remove suspended substances and organic pollutants, and through the hydrolysis acidification process, uses the action of microorganisms to convert complex non-dissolved polymers in the water body into simple dissolved monomers, promoting the subsequent biodegradation process;

[0052] The described suspended ball microbial filler and filter material contact oxidation unit promotes nitrification and denitrification reactions through sieve micro-nano aeration, small molecule cluster water generator and magnetic equipment. Using the microorganisms in the filler to continuously carry out contact oxidation reactions during the full contact with the sewage, the nano-bubble stones on the surface layer generate oxygen aeration in visible light, and a certain amount of muddy sewage containing mud is refluxed from the external drainage of the sedimentation tank to the hydrolysis acidification tank at the front end of this tank for better denitrification and removal of organic pollution. The calculation method of the reflux flow rate is:

[0053] Qr = Q1 * f1 / Xi

[0054] The total amount of pollutants produced at the current time, Q1, is multiplied by the sludge return ratio, f1, and then divided by the sludge mass concentration, Xi, to obtain the return flow rate, Qr.

[0055] In the suspended ball filler and filter aerobic unit, through sub-screen micro-nano aeration, small molecular cluster water generators, and magnetic equipment, the contact between the water body and the filler is enhanced to promote oxidation, nitrification, and denitrification reactions. The nano-bubble stones on the surface generate oxygen for aeration in visible light. In addition to having good filtration and contact oxidation reaction effects, the suspended ball filler and filter have a large specific surface area and the characteristics of being loose and porous, making them easily utilized by microorganisms. They can provide essential trace elements for the growth and reproduction of microorganisms, improve the biochemical rate, and their activated sites effectively achieve biodiversity and improve the denitrification efficiency.

[0056] In the microbial agent coagulation precipitation and sludge thickening, pressing, and drying unit, a microbial agent is used for coagulation precipitation to remove pollutants, and inclined parallel tubes are used to improve the precipitation efficiency. The sludge treatment unit includes an inclined tube sedimentation tank, a plate and frame filter press, a sludge thickening tank, and a drying pool. The concentrated sludge is separated from the water by the plate and frame filter press, and the mud blocks are dried in the drying pool and then added with microorganisms to be used as organic fertilizers.

[0057] In the sulfur autotrophic and high-efficiency denitrification filter unit, the sulfur autotrophic bacteria themselves will continuously reproduce and grow, forming a complete growth and reproduction system to achieve the purpose of water purification and recycling. Using the metabolic action of the sulfur autotrophic bacteria group, the pollutants in the water are converted into harmless or useful substances. The suspended ball filler and the suspended ball denitrification filter have a large specific surface area and the characteristics of being loose and porous, making them easily utilized by microorganisms. They can provide essential trace elements for the growth and reproduction of autotrophic microorganisms, improve the biochemical rate, effectively remove total nitrogen, and completely solve the problems of insufficient carbon source and denitrification in sewage treatment, with sustainability and environmental benefits.

[0058] In the disinfection and water quality automatic monitoring unit, the equipment is installed beside the pool body for easy manual maintenance of the ultraviolet lamp. After ultraviolet lamp disinfection, to further ensure that the effluent water quality meets the standards constantly, a water quality automatic monitoring system is set at the external drainage outlet.

Claims

1. A sewage treatment system is mainly for treating domestic sewage with a water quality concentration within 3000 mg / l, organic sewage in the food and various industries, and is characterized in that: It is composed of a grid pretreatment unit, an oil separation tank unit, a microbial agent coagulation primary sedimentation tank, a collecting tank unit, a high-speed air flotation machine purification unit, a hydrolysis acidification and anoxic tank, a sieve nano-bubble generator, a suspended sphere microbial filler contact oxidation and aerobic tank unit, a microbial agent coagulation inclined tube sedimentation tank, a sulfur autotrophic denitrification filter material unit, and a disinfection and automatic monitoring unit; The grid pretreatment unit includes a sewage discharge ditch and an automatic grid machine, which are used to remove large garbage, meat foam, residues and impurities in the water body, so that the sewage for subsequent treatment contains less impurities; The oil separation tank unit is provided with a three-stage oil separation tank, with water flowing through vertical straight pipes, entering from the bottom, and the straight pipes guiding the water to the surface to connect to a positive tee, and then flowing horizontally to another oil separation tank for convenient pipeline cleaning. The three-stage oil separation tank effectively separates and removes floating oil and suspended solids in the sewage through gravity sedimentation and physical blockage; The high-speed air flotation machine purification unit is that the high-speed air flotation machine uses the micro-charge high-speed air flotation separation technology and combines the new jet cutting dissolved air technology to generate stable and efficient micro-bubbles. The dissolved air efficiency of the micro-charge high-speed air flotation machine is as high as 95%-99%, effectively removing suspended solids, organic matter and residual oil particles; The microbial agent coagulation primary sedimentation and hydrolysis acidification unit uses a coprecipitation microbial agent to precipitate and remove most of the organic matter from suspended solids and organic pollutants, and through the hydrolysis acidification process, using the action of microorganisms, converts complex non-dissolved polymers in the water body into simple dissolved monomers, promotes the subsequent biodegradation process, and improves the biochemical rate; The anoxic tank provides an anoxic environment for the sewage, enabling denitrifying bacteria to carry out denitrification reactions under such conditions. The dissolved oxygen concentration in the anoxic tank is usually controlled between 0.2-0.5mg / l. In this environment, denitrifying bacteria use the undegraded carbon-containing organic matter in the sewage as a carbon source to reduce the nitrate nitrogen refluxed from the aerobic tank through internal circulation to N2 and release it, playing a role in the denitrification process, removing nitrate nitrogen through denitrification, and also removing part of the BOD5. And through the action of hydrolysis reaction, the biodegradability of the sewage is improved. Through the treatment of the anoxic tank, the organic matter content in the sewage can be effectively reduced, and the efficiency of subsequent biological treatment can be improved. The sieve nano-bubble generator introduces air or oxygen into the micro-nano generator. The gas is adsorbed in the micropores through the molecular sieve, gas separation and purification are achieved in the micropores of the molecular sieve, gas molecules interact to form bubbles and are released from the molecular sieve to form nano-bubble aeration; The suspended sphere microbial filler contact oxidation unit promotes nitrification and denitrification reactions through a sieve nano-bubble generator, a small molecular cluster water generator and magnetic equipment. The microorganisms continuously carry out contact oxidation reactions during the full contact between the filler and the sewage. The nano-bubble stones on the surface generate oxygen for aeration in visible light, and a certain amount of muddy sewage containing mud is refluxed from the external drainage of the sedimentation tank to the hydrolysis acidification tank at the front end of this tank for better denitrification and removal of organic pollution. The calculation method of the reflux flow rate is: Qr = Q1 * f1 / Xi The total amount of pollutants Q1 at the current time is multiplied by the sludge return ratio f1 and then divided by the sludge mass concentration Xi to obtain the return flow Qr. In the suspended ball microbial filler contact oxidation aerobic unit, through a sieve nano-bubble generator, a small molecular cluster water generator and a magnetic device, the circulation contact between the water body and the filler is enhanced, promoting oxidation, nitrification and denitrification. The nano-bubble stones on the surface layer generate oxygen for aeration in visible light. Because of its large specific surface area and the characteristics of being loose and porous, it is easily utilized by microorganisms, can provide necessary trace elements for the growth and reproduction of microorganisms, improve the biochemical rate, and its activation sites effectively realize biological diversity and improve the denitrification efficiency. In the microbial agent coagulation precipitation and sludge thickening, pressure filtration and drying unit, the microbial agent is used for coagulation precipitation to remove pollutants, and the inclined parallel tubes are used to improve the precipitation efficiency. The sludge treatment unit includes an inclined tube sedimentation tank, a plate and frame filter press, a sludge thickening tank and a drying tank. The concentrated sludge is separated from the water through the plate and frame filter press, and the mud cake is dried in the drying tank and added with microorganisms to make organic fertilizer. In the sulfur autotrophic and high-efficiency denitrification filter media unit, the sulfur autotrophic bacteria themselves will also continuously reproduce and grow, forming a complete growth and reproduction system to achieve the purpose of water purification and recycling. By using the metabolic action of the sulfur autotrophic bacteria group, the pollutants in the water are converted into harmless or useful substances. The suspended ball microbial filler contact oxidation and the suspended ball denitrification filter media, because of their large specific surface area and the characteristics of being loose and porous, are easily utilized by microorganisms, can provide necessary trace elements for the growth and reproduction of autotrophic microorganisms, improve the biochemical rate, effectively remove total nitrogen, and completely solve the problems of insufficient carbon source and denitrification in sewage treatment, with sustainability and environmental benefits. In the disinfection and water quality automatic monitoring unit, the equipment is installed beside the pool body for convenient manual maintenance of the ultraviolet lamp. After ultraviolet lamp disinfection, to further ensure that the effluent water quality meets the standards constantly, a water quality automatic monitoring system is set at the external drainage outlet.

2. According to the process flow of a sewage treatment system described in claim 1, it includes the following specific steps: S1: The water body to be treated first passes through an automatic grille to remove impurities such as garbage, meat foam and residues. S2: The sewage undergoes oil-water separation and pollutant precipitation in a three-stage oil interceptor. S3: With the technologies of a high-speed air flotation machine and a new type of jet cutting dissolved air, stable and efficient micro-bubbles can effectively carry away suspended solids and oil particles. The air flotation machine efficiently completes oil-water separation and removes organic pollutants, making the water body reach a purified effect. S4: The microbial agent coagulates pollutants to complete primary sedimentation and hydrolysis acidification. The pollutants are precipitated and the complex, non-dissolved polymers in the water body are converted into simple dissolved monomers through the hydrolysis acidification process. The macromolecular organic matter is transformed into small molecular substances through the action of extracellular enzymes of microorganisms. To better denitrify and remove organic pollutants, a certain amount of muddy sewage is refluxed from the effluent water of the sedimentation tank to the hydrolysis acidification tank. S5: The anoxic tank provides an oxygen-deficient environment for sewage, allowing denitrifying bacteria to undergo denitrification under such conditions, removing nitrate nitrogen through denitrification. At the same time, it can also remove part of the BOD5, effectively reducing the organic matter content in the sewage and improving the efficiency of subsequent biological treatment. S6: The sieve nano bubble generator introduces air or oxygen into the micro-nano generator. The gas is adsorbed in the micropores through the molecular sieve, and the gas is separated and purified in the molecular sieve micropores. The gas molecules interact to form bubbles and are released from the molecular sieve to form nano bubble oxygenation; S7: Suspended ball microbial filler contact oxidation and high-efficiency denitrification filter contact oxidation pool, through the functional equipment including laser cavitation micro-nano aeration, small molecular water generator and magnetic equipment, increase the contact between water and filler, promote oxidation, nitrification and denitrification reactions, use microorganisms to continuously carry out contact oxidation reaction in the full contact between filler and sewage, the nano bubble stone on the surface produces oxygen in visible light to directly increase oxygen naturally, effectively removing organic pollutants; S8: Suspended ball microbial filler contact oxidation aerobic pool, through the screening nano bubble generator, small molecular water generator and magnetic equipment, to strengthen the contact between water and filler, promote nitrification and denitrification reaction, multiple large flow pumps with magnetized water and small molecular water continuously cross to the central suspended ball microbial filler contact oxidation filter box to transport water, so that the water circulates and contacts the filler, more fully contact oxidation reaction, and because the filler and filter material have a large specific surface area and are loose and porous, they are easily used by microorganisms, can provide the necessary trace elements for microbial growth and reproduction, improve the biochemical rate, and its activation point effectively realizes biodiversity and improves the sewage treatment effect; S9: Microbial preparation coagulation sedimentation tank and sludge concentration filter press drying unit. Microbial preparations are added as needed to make pollutants enter the sedimentation tank for more thorough separation, and inclined parallel pipes are used to improve sedimentation efficiency and remove pollutants more thoroughly. The sludge treatment unit includes an inclined tube sedimentation tank plate and frame filter press, a sludge concentration tank, and a drying tank. After the sludge is concentrated, the plate and frame filter press is used to separate the mud and water. After the mud blocks are dried in the drying tank, microorganisms are added as organic fertilizers. S10: The autotrophic and high-efficiency denitrification filter material adopts the principle that sulfur autotrophic bacteria will continue to reproduce and grow, forming a complete growth and reproduction system to achieve the purpose of water purification and recycling; the metabolic action of sulfur autotrophic bacteria is used to convert pollutants in the water into harmless or useful substances. The sulfur autotrophic high-efficiency denitrification filter material has a large specific surface area and is loose and porous, which is easily used by microorganisms. It can provide necessary trace elements for the growth and reproduction of autotrophic microorganisms, improve the biochemical rate, and effectively remove total nitrogen, solving the problem of insufficient carbon source and denitrification in sewage treatment. It is sustainable and environmentally friendly; S11: Automatic monitoring of toxic and external drainage water quality. UV lamp disinfection lamps are installed on the upper layer and near the pool side to make it easier to replace and clean the lamps manually. Automatic water quality monitoring is set at the rear section of the clear water tank to ensure that the water meets the discharge standards.

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