507 results about "Oxidation ditch" patented technology

Provided are system of value resource in acidic corrosion waste fluid and a recycling method. The recycling method of the invention includes the following steps that adding oxidation agent and concentrated sulfuric acid into the corrosion waste fluid, pre-heating and heating the corrosion waste fluid, evaporating out water vapor and hydrogen chloride under negative pressure and recycling hydrochloric acid, the residue separates hydric sulphate from blue copperas crystal via centrifugal filtration and recycle hydric sulphate, washing blue copperas crystal by blue copperas crystal solution and absolute ethyl alcohol and recycling blue copperas. The recycling system comprises an oxidation ditch, a dosage bunker, a pre-heater, a heat booster, an evaporation tank, a filter, a cooler, a spraying and absorbing device and the like. The recycling method of the invention increases the recovery rate of metal copper and hydrogen chloride, with both recovery rates more than 99%. The method can employ scheme of batch operation or continuous recycling, which is adapted for industry utilization.

The invention discloses an oxidation channel intelligent control system, which bases on the digging water change and belongs to the water pollution controlling technical field in the environmental protection. The system consists of a digging-water monitoring system, an operation decision support system, a control system and a process on-line monitoring system. According to the dynamic change of the digging water, the system timely monitors the change and collects dynamic data information into the decision support system. Through the simulation analysis of the decision support system, corresponding suitable operation conditions and control strategies are generated. The running state of the system is determined. Then, the process operation is regulated through the controlling system. And system operation parameters are monitored by on-line monitoring equipments and are fed back to the control system and the operation decision system. The feedback verification and the decision correctionare implemented on the system running strategies to guarantee the successful application of the simultaneous nitrification and denitrification of the oxidation channel process. Both the application of the advanced technology in the sewage treatment process is guaranteed and great energy saving and consumption reduction are realized. The larger treatment potentiality of water plants is exploited.

The invention provides a method for treating livestock and poultry breeding waste water. The method mainly comprises the following steps of solid-liquid separation treatment, efficient nitrogen-phosphorus biochemical circulation treatment, modified oxidation ditch treatment, sludge reflux treatment, filtration and sterilization treatment and the like. The invention aims to provide the method for treating the livestock and poultry breeding waste water, which is high in capability of removing ammonia nitrogen, total nitrogen and total phosphorus and low in investment cost and running cost, and is easier to manage. The waste water treated by adopting the method provided by the invention can meet the requirement of the national Discharge standard of water pollutants for livestock and poultry breeding GB18596-2001; not only can the up-to-standard discharge requirement in the waste water treatment of the livestock and poultry breeding industry be effectively met, but also the difficult problem of removing the ammonia nitrogen while an organic matter is degraded is also solved; and the method is suitable for the waste water treatment of breeding farms on different breeding scales, similarly, is also suitable for the treatment of municipal domestic waste water and waste water with a high COD (chemical oxygen demand) or high ammonia nitrogen characteristic, and is wide in application prospect.

The present invention relates to an A2 / O oxidation channel process synchronous nitrification and denitrification control method and its equipment, belonging to the field of domestic sewage biodenitrogenation technology. It is characterized by that said method includes the following steps: utilizing DO on-line monitoring apparatus to monitor the macroscopic aerobic-anoxic environment formed in oxidation channel aeration basin; utilizing ORP on-line monitoring apparatus to monitor the microscopic aerobic-anoxic environment formed in oxidation channel aeration basin; and utilizing computer to control frequency conversion air blower to control aeration quantity so as to ensure that the macroscopic and microscopic nitrification reaction and denitrification reaction can be simultaneously implemented.

The invention discloses an integrated oxidation ditch and a construction and operation method thereof. The construction and operation method has the technical proposal that the integrated oxidation ditch is divided into an anoxic zone, an anaerobic zone and an aerobic zone, which are communicated mutually, the anoxic zone and the anaerobic zone are arranged at one end of the integrated oxidation ditch in common, the aerobic zone is arranged at the other end of the integrated oxidation ditch, and a water-retaining wall is arranged at the middle part of each zone to cause each zone to be formed a single annular channel, water inlet pipes used for feeding water by the division point way are arranged at the anoxic zone and the anaerobic zone, an aeration device is arranged in a circulation channel at one side of the aerobic zone communicated with the anoxic zone, and a mud-water separation device used for the mud-water separation and the water emission is built on the side wall of the aerobic zone for the water emission. The aeration device is started, and the sewage passes through the anoxic zone, the anaerobic zone, the aerobic zone, and the mud-water separation device in sequence, so the dephosphorization and the denitrification as well as the decarbonization treatments of the sewage are realized. The integrated oxidation ditch has the advantages of simple structure, lower cost, small occupation area, and good sewage treatment effect, and can particularly and effectively perform the dephosphorization and the denitrification simultaneously.

The invention relates to an anaerobic-anoxic oxidation ditch technique denitrification dephosphorization device and a method thereof, and pertains to the technical field of sewage treatment. Directed against the problem that the present oxidation ditch technique has unsatisfactory biological dephosphorization effect, the invention improves the traditional oxidation ditches so as to strengthen the dephosphorization capacity. Based on the traditional oxidation ditch treatment devices, an anaerobic tank and an anoxic tank A and an anoxic tank B are additionally provided, and a novel oxidation ditch technique that has the capability of denitrification and dephosphorization is developed. Characteristics and differences of phosphorus-accumulating bacteria, denitrifying bacteria and denitrification phosphorus removal bacteria are fully utilized so as to lead microorganisms of three kinds to occupy different ecological niches in three different selectors in one system, thereby realizing different functions respectively. By distributing reflux sludge and feeding water in a reasonable way, the invention relieves conflict between the phosphorus-accumulating bacteria and the denitrifying bacteria, and the competitive edge of the denitrifying bacteria is enhanced during competition, thus realizing high efficiency of denitrification and dephosphorization. The invention has the advantages of high dephosphorization efficiency, relatively stable operation, sludge bulking resistance, etc.

This invention discloses a sewage process technology for clearance fan aeration oxidation channels including a preanoxic pond, an anaerobic pond, an anoxic pond, an oxidation channel and a deposition pond, in which, the intake volume of the preanoxic pond is 10-30% of the flow of the original sewage flow, the intake volume of the anaerobic pond is 70-90%, the oxidation channel applies a flow of continuous water-intaking, clearance fan aeration and continuous outgoing and sets a deposition pond for discharging water, and mud of the deposition pond flows back to the pre-anoxic pond continuously and the mixed solution flows back to the anoxic pond, second stage anoxic ponds are increased to industrial waste water with poor biochemistry to increase the process efficiency.

A high-efficient denitrification and dephosphorization MBR process and device relate to a sewage treatment process for denitrification and dephosphorization. A membrane bioreactor is combined with an oxidation ditch process; the high-efficient denitrification and dephosphorization MBR device comprises an anaerobic external cisterna, an anoxic internal cisterna, an aerobic membrane cisterna and a central island which are sequentially formed into a concentric elliptic cisterna channel; and two sides of the aerobic membrane cisterna and the central island are respectively provided with membrane devices. The process is characterized in that miscible liquid circumfluence from the aerobic membrane cistern to the anoxic internal cisterna and from the anoxic internal cisterna to the anaerobic external cisterna is arranged on the basis of the fluid state of the annular oxidation ditch process, thereby the dephosphorization effect of the process is enhanced; the membrane devices are arranged in the process so as to be able to effectively block microorganisms in filthy mud miscible liquid and suspended pollutants such as colloidal phosphorus, and the like, improve the concentration of the filthy mud and lower the yielding water SS. The process has simple operation, stable running and strong impact resistance load capacity, and is particularly suitable for treating industry and sanitary wastewater with unstable input water quality; and in addition, the output water quality can satisfy the standard of the natural landscape water.

The invention relates to the field of wet flue gas desulfurization, especially to a flue gas thionizer of ammonia-ammiaonia sulfate method. The thionizer is divided into three segments, wherein the lower segment of the thionizer is a circulation fluid-absorbing tank, the middle segment of the thionizer is a concentration cooling segment, and the upper segment is an absorbing segment. The concentration cooling segment is separated to the absorbing segment and the circulation fluid-absorbing tank by tower-separating plate at the two end planes upper and lower. The dual cycle three-segment thionizer of ammonia-ammiaonia sulfate method of the invention resolves the design disadvantage of general single-tower and multi-tower. The byproduct that is ammiaonia sulfate is concentrated by high-temperature flue gas to reduce the temperature to a temperature propitious to absorb. The dual cycle design of the thionizer makes the cycle absorbing liquid to be not contacted directly with the high-temperature flue gas to control the cycle absorbing liquid at a low concentration, and is beneficial to the desulfurization clear flue gas to avoid the condition forming aerosol and make the solution sent to the oxidation ditch approaching to the optimal oxidation concentration. The composite cost for flue gas desulfurizing can be reduced, using the quantity of heat of the flue gas in the entrance to cycle concentrate the diluted solution of ammonia-ammiaonia.

The invention discloses a treatment process for recycling water in pulping and papermaking wastewater. The treatment process comprises the following steps of: removing suspended matters of the pulping and papermaking wastewater and carrying out anaerobic treatment; and then, carrying out aerobic treatment through an oxidation ditch and inputting the wastewater into a secondary sedimentation basin to precipitate and carry out mud-water separation; and then, carrying out coagulating sedimentation and filtering; and finally, carrying out ozone catalytic oxidation treatment to obtain the water. The treatment process provided by the invention has the advantages of simple process flow, lower construction and operation cost and simplicity in management, and can effectively treat the pulping and papermaking wastewater and realize reuse of reclaimed water, so that the treatment process has an extremely good application prospect.

The invention discloses a system and a process for sludge in situ decrement enhanced by utilizing metazoan and application of the process. The system comprises an anaerobic zone, an anoxic zone, an oxic zone, a metazoan growing zone and a secondary sedimentation zone. A biochemical system can perform in situ decrement through arranging the metazoan growing zone in the sewage treatment process; and cultivated and domesticated metazoan is continuously added in the metazoan growing zone to enhance organism predation, thereby achieving the purpose of sludge in situ decrement and realizing sludge decrement effect of 50-80% of activated sludge. The process of activated sludge in situ decrement with an efficient biological method is suitable for any activated sludge methods and deformation technologies thereof, such as A<2> / O (anaerobic-anoxic / oxic), A / O (anoxic / oxic), SBR (sequencing batch reactor), MSBR (modified sequencing batch reactor), CASS (cyclic activated sludge System), oxidation ditch, MBR (membrane bio-reactor) and the like, can also be used for a biological treatment technology having a biological carrier, can be used for sludge decrement of a newly-built sewage treatment engineering and can also be used for transformation of a built engineering with extremely low transformation cost.

The invention relates to an A<2>O technique with the integration of dephosphorization and denitrification and is similar to an ORBAL oxidation ditch, and pertains to the technical field of sewage treatment. Sewage flows through an inner ditch / inner tank, a middle ditch and an external ditch in sequence and all the ditches are similar to the ORBAL oxidation ditch; the inner ditch / inner tank is designed as an anaerobic tank or an anoxic tank; the middle ditch is designed as an anoxic tank or an anaerobic tank; the external ditch is designed as an aerobic tank. The technique combines the advantages of the ORBAL oxidation ditch, the A<2>O technique and a reversed A<2>O technique; compared with other common activated sludge methods, the invention can remove more phosphorus from the sewage, and has better dephosphorization and denitrification effect; the whole process has small area occupancy; integrated construction technique particularly can construct a secondary settling tank, reflux of nitrification and reflux of sludge in an integrate way; floor area is greatly saved by sharing walls, and investment capital for equipment is low.

The invention provides an industrial sewage treatment system and an industrial sewage treatment method, which solve the problems that the existing industrial sewage is difficult to treat and not desirable for phosphorous and nitrogen removal effect and the like. The sewage treatment method comprises the process steps as follows: (1) solid sundry separation; (2) anaerobic hydrolysis; (3) oxidation ditch biochemistry treatment process including flora culture in activated sludge, biochemistry nitrogen and phosphorous removal; (4) secondary settling; (5) coagulation and phosphorous removal; (6) flocculation and disinfection; and (7) removal of suspended solid and phosphorous.

The improved type oxidation channel urban sewage treatment process is characterized by that the detritus pool adopts eddy flow detritus pool, before the returned sludge is returned into oxidization channel, said sludge must be undergone the process of anaerobic treatment for 1-2 hr.; the design parameters of the improved oxidization channel are as follows: sludge aye is 10-15 days, and sludge concentration is 4000-5000 mg / L, water outlet of the improved oxidization channel is placed in the oxygen-enriched zone of downstream of aeration machine or independently-set forced aeration zone, and its sedimentation tank adopts a peripheral intake and peripheral discharge type. Said invention eliminates the sludge concentration pool, and adopts an integrated sludge concentration dehydration machine to make concentration and dehydration of residual sludge. Its phosphorous-removing efficiency is up to above 87%.

The invention discloses a moving-bed biofilm oxidation ditch, comprising a ditch body which is provided with a water inlet, a water outlet and a sludge discharge outlet, wherein the ditch body is internally provided with a guide wall and an aeration device, moving filler is filled in the ditch body, a water outlet screen mesh is arranged at the water outlet part, and a sludge discharge screen mesh is arranged at the sludge discharge outlet. The moving filler flows together with the sludge-water mixed liquid in the oxidation ditch so as to improve the sludge concentration in the oxidation ditch, thereby improving the processing efficiency of the oxidation ditch. The moving-bed biofilm oxidation ditch has the characteristics that the floor area of the oxidation ditch is less than that of the conventional oxidation ditch, the sludge concentration is obviously improved, the operating cost is lowered, the operation is simple and convenient, the effluent quality is stable, and the nitrogen and phosphorus removal effect is good.

The invention discloses a water purifying device and system of suspension sway-typed biochemical reactor, which comprises the following parts: water body, purifying device, water body fender system, technique flow path, pipe system, aerating system and program control system, wherein at least one purifying element is set in the water purifying device, which adopts MBR membrane reactor; the suspension system of the purifying element is set in the water purifying device, which contains rigid frame, rotary mechanism and locking piece; the water barrier wall divides the water body fender system into water body S1, S2 and S3...; the water body S2 and S3... is seal loop-shaped water body; the device assembles the purifying element in the water body S1 through the suspension unit of the purifying element, which combines the MBR membrane reactor with solid-liquid separator and oxidation ditch technique together; a pusher is set in the loop-shaped water body, which flows the water body and sways the purifying element.

The invention relates to an improvement on an oxidation ditch guide flow device, which is characterized in that: the upper end of a flow deflector is movably arranged on the pond wall of an oxidation ditch, while the lower end can be adjusted according to swing angles of the upper end; and the flow deflector also can move forward and backward. Firstly, an adjustable flow deflector can play a roleof the flow deflector to the maximum extent and avoid the defects caused by fixing and non-adjustment of the flow deflector; moreover, when the flow deflector is not needed, the flow deflector can belifted, so that the flow deflector does not become a burden because of the setting; secondly, the depth and the width of the oxidation ditch can be increased, so that the floor area of the oxidation ditch is reduced, and the land acquisition cost and the floor area are saved; thirdly, by matching of the flow deflector, the number of started aeration equipment can be reduced as required, and the operating energy consumption is lowered; and finally, the oxidation ditch is always ensured to operate in the best working state, and by the setting of meters such as an on-line current meter, a dissolved oxygen meter and the like and the automatic control of a computer, the oxidation ditch can fully automatically operate in the best working state.

The invention relates to a zanjon air lifting pushing solid circulation inversion A<2>O integrated construction oxidation ditch, which comprises an anoxic zone, an anaerobic zone, an aerobic zone provided with a millipore aerator group and an inversion A<2>O integrated construction oxidation ditch of a solid and liquid separating zone. The solid and liquid separating zone is arranged at the front end of a main ditch, the anaerobic zone is arranged at the tail end of the main ditch, and water inlets are respectively arranged at the front ends of the aerobic zone and the anaerobic zone. The integrated construction oxidation ditch is characterized in that a horizontal partition board which divides the main ditch into an upper groove layer and a lower groove layer is arranged at the middle-lower part of the main ditch, the aerobic zone and the anaerobic zone are respectively arranged at the upper groove layer and the lower groove layer, the aerobic zone is internally provided with n (n is more than or equal to 1) aeration lifting zone (s) which is (are) composed of an inlet water-retaining wall, an outlet water-retaining wall and the millipore aerator group and is (are) provided with a lower water inlet and an upper water outlet, the horizontal partition board of a first grade aeration lifting zone is provided with a plurality of lifting holes, and the aerobic zone is internally divided into n aerobic reaction zone (s) corresponding to the aeration lifting zone (s).The integrated construction oxidation ditch has the advantages that: the yielding water quality, particularly the dephosphorization and denitrification effect, is better, the occupation area is reduced, the equipment is reduced, the operation is simplified, and the operation cost is lowered.

The invention relates to a treatment method of potato type non-grain starch fuel ethanol distiller solution. The method comprises the following steps: waste distiller solution is pretreated simply and adjusted by an adjusting tank and then enters an anaerobic treatment system, wherein the first-stage anaerobic treatment adopts well mixed high temperature anaerobic fermentation and the second-stage anaerobic treatment adopts a medium temperature UASB anaerobic reactor; different microorganisms are utilized to degrade the organic pollutants in the wastewater and generate biogas; a cooling device, a setting tank and an air flotation device are arranged between the two anaerobic reactors to ensure the concentration of the well mixed high temperature anaerobic sludge; the two-stage anaerobic effluent enter two serial sections of oxidation ditches to further remove the organic matter; different denitrification technologies are selected according to ammonia nitrogen indexes to obtain stable denitrification effect; and finally flocculation precipitation and physicochemical treatment are performed, and the obtained water meets the standards and is discharged. The method of the invention has low cost, stable technology and high biogas extraction efficiency of wastewater; and the obtained sludge is used as organic fertilizer and the effluent meet the grade A standard of the integrated wastewater discharge standard (GB8978-1996) for the alcohol industry.

The invention discloses a zeolite ceramisite filter material prepared by gangue and a preparation method of the zeolite ceramisite filter material. The zeolite ceramisite filter material is prepared by taking a large amount of gangue waste generated by China every year as a main raw material through technological means of sintering, hydro-thermal treatment and the like. The technology has the following key points that 1, the gangue is sintered into a ceramsite material with multiple holes inside, and 2 the surface of ceramsite is transformed into a zeolite structure through alkaline water heat treatment. The prepared multi-hole biological filter material has a multi-level hole structure, the density is close to that of water, the zeolite ceramisite filter material is applied in technologies such as biological aerated filters, oxidation ditches in the field of sewage treatment, and meanwhile, the zeolite ceramisite filter material has a biological film hanging function and a heavy metal ion adsorbing removing function and the like.

The invention discloses a dyeing wastewater treatment and recycling technical system which comprises a pretreatment system, an oxidation ditch and an advanced treatment system, wherein the pretreatment system comprises a water collecting well, a preliminary sedimentation tank and a regulating tank; the water collecting well communicates with the preliminary sedimentation tank; the preliminary sedimentation tank communicates with the regulating tank; the regulating tank communicates with the oxidation ditch; the oxidation ditch communicates with a secondary sedimentation tank; the secondary sedimentation tank respectively communicates with the preliminary sedimentation tank and a coagulative reaction sedimentation tank; the coagulative reaction sedimentation tank communicates with a sludge concentration tank; and the advanced treatment system communicates with the coagulative reaction sedimentation tank, and comprises an aeration biological filter tank, an ozone contact tank and a filter tank. The dyeing wastewater treatment and recycling technical system has the advantages of thorough wastewater treatment, high economic feasibility, stable operation, lower energy consumption and the like, and is simple to operate. Various treatment units are integrated to display the respective treatment advantages and functions, thereby providing a reliable and economical solution for dyeing wastewater treatment and recycling.

The invention discloses a high-efficient oxidation gouge sewage organism treating method and a system which comprise a ring shape oxidation gouge with at least two gouge paths, a low speed surface aerator, a water inlet and a water outlet. A partition is arranged between the adjacent gouge paths; the low speed aerator is arranged on the partition shared by the adjacent gouge paths of the oxidation gouge; the two sides of the partition out of the impeller of the aerator are respectively provided with an arc flow guiding board at the corresponding position; or the low speed surface aerator is arranged in the gouge paths of the oxidation gouge; at the same time, the side of the impeller of the aerator near the gouge path wall of the oxidation gouge is provided with a semicircular flow guiding board. The gouge path system of the oxidation gouge adopts the oxidation gouge formed by concentric circle walls with comparatively smaller resistance loss with big gouge path flowing speed, good mixing effect and no need of adding mixing apparatus; at the same time, the low speed surface aerator is adopted, and the aeration efficiency is high.

The invention discloses a method and a device for controlling synchronous nitration and denitrification in a surface aeration oxidation ditch process, and relates to the technical field of biological denitrification of domestic sewage. The conventional surface aeration oxidation ditch process has the problems that removal rate of total nitrogen is low, energy consumption is high, and environment of synchronous nitration and denitrification is hardly controlled. Dissolved oxygen (DO) and ammonia nitrogen at the water outlet of an oxidation ditch aeration basin are monitored by DO and ammonia nitrogen on-line monitors, the turn-on and turn-off of a reverse umbrella surface aerator and a water impeller are controlled by indication of an on-line instrument, organic matter in the aeration basin is oxidized by fully using nitrate nitrogen, excessive aeration is avoided simultaneously, and double aims of energy saving and high-efficiency denitrification are fulfilled.

The invention discloses a combined treatment method for high-standard discharge of papermaking wastewater, which solves the difficult problem of papermaking wastewater. The technical solution includes the following steps: physical and chemical treatment of papermaking wastewater after deslagging, separation of sludge and water, and promotion to PAFR reactor for hydrolysis and acidification reaction, after hydrolysis and acidification, the effluent flows into the improved oxidation ditch system, and after separation of cement and water from the oxidation ditch, it is promoted to high-grade The oxidation system flows into the final sedimentation tank after coagulation reaction after dosing, and the supernatant is discharged up to the standard. The method can make the effluent CODCr≤70mg / L after the papermaking wastewater is treated, basically reaching the higher industrial wastewater treatment control standard.

The invention discloses a Bardenpho nitrogen and phosphorus removal technology based on an MBBR, and belongs to the field of sewage purifying treatment. A treatment system adopted in the technology sequentially comprises an anaerobic pool, a first anoxic pool, a first aerobic pool, a second anoxic pool and a second aerobic pool; by putting suspended filler into the first aerobic pool, the nitrification load of an aerobic zone is greatly increased, the effluent NH<4+>-N can be lowered to a low level, and the nitrification function is good; by putting the suspended filler into the second anoxic pool, the denitrification load of the second anoxic pool is significantly increased, and the nitrification load and the denitrification load can be regulated according to the putting amount of the suspended filler to meet different effluent quality standards. According to the technology, traditional and conventional sewage treatment technologies such as an A2-O technology and an oxidation ditch technology are conveniently upgraded and improved, the treatment capacity of the existing technologies is promoted, increasement of the treated water amount or improvement of the effluent quality standard is met, and the floor area can be greatly reduced for a new project.

The invention discloses an anaerobic microporous aerator oxidation ditch reactor and a sewage treatment method. The reactor comprises a plurality of treatment zones which are adjacent to and communicated with one another hydraulically, wherein the treatment zones comprise a hydrolysis zone, an anaerobic zone, an anoxic zone, an aerobic zone and a settling zone. Supernate return channels are formed between the settling zone and the hydrolysis zone for returning nitrate-containing supernate from the settling zone to the hydrolysis zone, and denitrification treatment is performed by using the action of denitrifying bacteria. The reactor integrates hydrolysis, anaerobic treatment, anoxic treatment, aerobic treatment and settling, thereby greatly saving floor area and reducing investment cost of infrastructure construction. The adopted internal and external return systems improve the utilization rate of the capacity of a pool, increase denitriding and dephosphorizing effects and reduce treatment cost.

The invention discloses a sewage treatment device which comprises a biochemical reaction tank, a magnetic separator, a sludge dewatering apparatus and a demoulding apparatus, wherein the magnetic separator is used for separating sludge from magnetic carriers. The invention also discloses a sewage treatment method for biofilm oxidation ditches, which is implemented by using the sewage treatment device; the sewage treatment method sequentially comprises a sewage treatment step and a sludge treatment step; and the sewage treatment method is characterized in that the magnetic carriers are added into the biochemical reaction tank; and in the sludge treatment step, at least a part of the sludge passes through the magnetic separator.

The invention discloses a real-time AAO oxidation ditch regulation system and a sewage treatment method thereof. The method comprises the following steps: denitrifying mixed solution in an anoxic pond and refluxing the denitrified mixed solution into an anaerobic tank to perform anaerobic phosphate release with raw water, so that the influence of nitrate on the anaerobic phosphate release in the traditional AAO process is overcome; entering the mixed solution in the anoxic pond, the returned sludge in a secondary sedimentation tank and return nitrification liquor in the oxidation ditch into the anoxic pond together, and performing nitrogen removal by denitrification; entering the mixed solution in the anoxic pond into the oxidation ditch, and creating an aerobic-anoxic alternative environment by virtue of regulation, so that simultaneous nitrification and denitrification are performed in the ditch, and a denitrification effect is enhanced; and regulating the aeration mode, reflux ratio and the like in real time according to signals acquired by each online monitor by using a PLC control system. The traditional AAO oxidation ditch is subjected to structure and equipment transformation and operating mode regulation, a set of real-time regulation system based on water inflow change is established, the problems such as sludge deposition, poor nitrogen and phosphorus removal effect and high energy consumption existing in the AAO oxidation ditch are solved, and the aims of allowing the effluent to stably reach the standard, saving the energy and reducing the consumption are achieved.