202results about How to "Improve nitrogen and phosphorus removal efficiency" patented technology

The invention discloses a device for autotrophic nitrogen removal by combining A / O shortcut nitrification of sludge digestion liquid and anaerobic ammonium oxidation of granular sludge and a method thereof. The device of the invention comprises a digestion liquid tank, an A / O shortcut nitrification tank, a sedimentation tank, a middle water tank, an anaerobic ammonium oxidation tank, wherein, the digestion liquid tank is communicated with a first cancellus as an anoxic zone of the A / O shortcut nitrification tank by the inlet pump of the A / O shortcut nitrification tank; the sedimentation tank the upper part of which is communicated with the middle water tank by a water pipe is provided with a central pipe and the anaerobic ammonium oxidation tank is provided with a water bath sleeve and a granular sludge bed. In addition, the method of the invention comprises the following steps of starting the A / O shortcut nitrification tank; starting the anaerobic ammonium oxidation tank of the granular sludge; operating an autotrophic biological nitrogen removal system in series after the starting of the A / O shortcut nitrification tank and the anaerobic ammonium oxidation tank is respectively completed. The device and the method of the invention are applicable to the shortcut nitrification and the nitrogen removal of the sludge digestion liquid in a sewage treatment plant and have the advantages of advanced technology, simple structure of the device, convenient operation and good treatment effect of water purification.

The invention relates to a carbon fiber wetland type ecological floating bed and an arrangement method thereof, belonging to the field of sewage treatment. The carbon fiber wetland type ecological floating bed comprises a bed body, a biological carbon fiber material, floating bed plants and a wetland tank, wherein the wetland tank is arranged in the bed body; the interior of the wetland tank is filled with a porous light-weight artificial wetland filler; the floating bed plants are planted in the middle of the filler; and the biological carbon fiber material is hung on a suspension rod at the bottom of the wetland tank. According to the carbon fiber wetland type ecological floating bed, the processes of the ecological floating bed, bio-contact oxidation and the artificial wetland are reasonably combined to ensure that sewage is firstly subjected to bio-contact oxidation to degrade most pollutants, then the sewage is intercepted and further degraded through the wetland structure, and finally, through the absorption effect of plant roots, the quality of the sewage is better improve; and meanwhile, the reasonable layout of plants can be used for achieving the purposes of beautifying the environment, improving the ecological diversity and promoting the degradation effect on the pollutants of the whole floating bed system.

The invention discloses a natural pyrrhotite biological filter and a method for synchronously removing nitrate nitrogen and phosphorus out of water by using the natural pyrrhotite biological filter, which belongs to the field of advanced wastewater treatment. The method comprises the following steps: (1) preparing and constructing biological filter fillers; (2) starting the biological filter; and (3) operating the biological filter. Pyrrhotite is used as an electron donor of sulfur autotrophic denitrification bacteria to reduce nitrate in the water to nitrogen so as to remove nitrate nitrogen out of the water; and the pyrrhotite and an oxidative product of the pyrrhotite remove phosphorus in such manners as adsorption and chemical precipitation so as to synchronously remove nitrate nitrogen and phosphorus out of the water. The biological filter disclosed by the invention is simple to construct, convenient to start, stable to operate, high in nitrogen and phosphorus removal efficiency and free of auxiliary materials, and the biological filter is applied to advanced wastewater treatment.

The invention belongs to the technical field of water treatment and particularly relates to a method and a system for advanced treatment of centralized rural domestic sewage. The treatment system comprises a hydrolytic acidification tank, a composite tower type ecological filter and a surface flow artificial wetland system. The treatment method comprises the following steps of: collecting sewage through a pipe network, allowing the sewage to enter the hydrolytic acidification tank which is a landfill tank, stabilizing and regulating the water quantity, and pumping the sewage into a high-position service reservoir by using a submersible electric pump with the head of more than 5m; distributing the domestic sewage of the hydrolytic acidification tank into the composite tower type ecological filter by strengthening water distribution measures, and removing organic pollutants, total nitrogen, ammonia nitrogen, total phosphorus and pathogenic microorganisms in the sewage; and allowing tail water and collected rainfall runoff to enter the artificial wetland system for advanced treatment. A good water environment landscape can be built for an artificial wetland; and the effluent reaches the first-grade A standard of discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002).

A modified floating denitrifying-dephosphorizing material for treating the water in river and lake or the sewage is proportionally prepared from La, Ce, Al and Ca ions, light aggregate with large specific surface area, powdered coal ash, surfactant, cement, etc through mixing, impregnating in water, filtering and calcining.

The invention discloses a device which can realize the shortcut nitrification of sludge-digestion liquid through the combined control of FA and FNA. The device is provided with a raw water box, a shortcut nitrification reactor, a sedimentation tank and a water tank; the shortcut nitrification reactor is divided into a hypoxia stirring area and an aerobic zone, and a DO / pH online controller is arranged in the aerobic zone; an air-blast-head is arranged at the bottom of the reactor; a method utilizing the device to realize the shortcut nitrification comprises the following steps: firstly, a system is started; and secondly, the adjustment is carried out in running; the invention is applicable to the nitrification of the sludge-digestion liquid of a sewage treatment plant, the structure of the device is simple, the process of the method is simple, the operation is convenient, a plurality of carbon sources are saved, the nitrification speed is fast, and the effect is good.

The invention discloses a rear denitrifying sewage treatment device and process. A water inlet bucket, a biochemical tank, a sedimentation tank and a water outlet bucket are connected with each other in sequence; the biochemical tank comprises three parts, such as an anaerobic zone, an aerobic zone and an anoxic zone; blenders are arranged in the aerobic zone and the anoxic zone; the anaerobic zone is connected with the anoxic zone by a carbon source shunt pipe; an aerator is arranged in the aerobic zone; the aerator, a gas flowmeter and a gas pump are connected with each other in sequence; the sedimentation tank comprises a central pipe, a reflective plate, a tank body, a water outlet weir and a water outlet; and the bottom of the sedimentation tank is connected with the anaerobic zone of the biochemical tank by a sludge backflow pipe. By using a single-sludge system, the device and process, disclosed by the invention, operate in the form of continuous flow according to an anaerobic-aerobic-anoxic mode. A mixed solution rich in polyhydroxyalkanoate in the anaerobic zone is shunted to the aerobic zone to provide phosphorus-accumulating bacteria with a carbon source so that the denitrifying phosphorus removal is realized in the aerobic zone. The device and process, disclosed by the invention, have the advantages of good nitrogen and phosphorus removal effect, simple process flow, low operation energy consumption, high carbon source utilization rate and the like, and are applicable to treatment of sewage (wastewater) with low C / N (Carbon / Nitrogen) ratio and low C / P (Carbon / Phosphorus) ratio.

The invention discloses a multi-point water inlet aeration anoxic-aerobic high-efficient nitrogen and phosphorus removal method. The method sequentially comprises the following steps of: (1) introducing sewage to be treated into a grille regulating tank through a water inlet pipe; (2) dividing the water after pretreatment by the grille regulating tank into two lines, wherein one line leads to an aeration tank and the other line leads to an anoxic tank; (3) sending the water in the anoxic tank into an aerobic tank; (4) dividing nitrified water after nitrification treatment in the aerobic tank into two lines, wherein one line returns to the anoxic tank, and the other line flows into a precipitation tank to perform mud-water separation; and (5) lifting sludge through a sludge lifting device, transporting the residual sludge to the outside through a sludge discharge pipe after passing through a sludge treatment system, and returning the sludge after lifting into the aeration tank. The method disclosed by the invention is suitable for new and transformation upgrading projects of high-ammonia nitrogen village and small town / industrial sewage treatment works, has the advantages of simplicity and convenience in management and maintenance, low cost, good treatment effects, strong nitrogen removal effect and the like, and is less affected by climatic conditions.

A technology for synchronously removing N and P from the city sewage features that the composite suspended living things system with active sludge and biomembrane is created in a batch of composite bioreactors, which in running by the sequence of anaerobic, aerobic and anoxic steps. Its advantages are short reaction flow, less consumption of carbon source, high effect and low cost.

The invention provides a three-dimensional ecological deodorization dephosphorization denitrification method, which is characterized in that in a sewage treatment system, multiple groups of water plants are suspended inside a reaction pond, an isolation purification layer capable of adsorbing the odor and preventing the odor from being scattered outwards is formed through branches and leaves of the water plants when an application system carries out the purification treatment and odor overflows upwards, and root and stem systems of the water plants in the sewage are used as ecological filler to adsorb and degrade the microorganisms and adsorb the odor, so that the deodorization dephosphorization denitrification treatment of waste water can be realized. The invention also provides a deodorization dephosphorization denitrification device designed according to the method and an application in processes such as sequencing batch reactor (SBR), Anoxic-Oxic (A / O), Anaerobic-Anoxic-Oxic (A2 / O), AB method, oxidation ditches, membrane biological reactor (MBR), modified university of cape town (MUCT) and the like. The sewage treatment plants of different processes are upgraded and modified, an ecological treatment way with low cost which is domain on a traditional sewage treatment system and assisted by purification organism through the plants is realized, and the pollutants can be maximally biologically degraded.

The invention discloses an activated sludge and biomembrane combined biological denitrification and dephosphorization treatment process, wherein dual sludge systems are employed to control the growth of nitrated bacterium, and the process is divided into two phases, in the first phase, an anaerobic / anoxybiotic / aerobic combined activated sludge process is employed to facilitate the growth of denitrifying bacteria, in the latter phase, a biological film method is employed to facilitate the growth of nitrated bacterium therein.

The invention discloses an efficient denitrification, dephosphorization, denitrification and phosphorus resource recycling process for urban sewage. The process comprises the following steps of: adding the sewage into an anaerobic pond; adding the sewage into a first sedimentation basin for sludge and water separation, adding sludge into an oxygen-poor pond across a nitrification pond, adding a part of supernatant into an induced crystallization reactor for dephosphorization, adding the part of dephosphorized supernatant into the nitrification pond, directly adding the other part of supernatant into the nitrification pond and converting ammonia nitrogen in the supernatant into nitrate; adding the sewage in the nitrification pond into a second sedimentation basin for sludge and water separation, adding the supernatant into the oxygen-poor pond for finishing phosphorus absorption and denitrification, making a part of sludge flow back into the nitrification pond and discharging the residual sludge; and adding the sewage into an aeration basin from the oxygen-poor pond and adding into a final clarifier from the aeration basin for sludge and water separation, discharging the supernatant, making a part of sludge flow back into the anaerobic pond and discharging the residual sludge. After being treated by the process, discharged water directly reach a first grade A standard of a pollutant discharge standard for municipal sewage treatment plants, and has extremely high dephosphorization and denitrification efficiencies.

The invention provides an AALOO multipoint water feeding synchronization denitrification and dephosphorization process. All pretreated wastewater Q1 enters an anaerobic tank, then flows through an anoxic tank, a low oxygen tank, a short-term aerobic tank and a precipitation tank sequentially, and then is discharged from the precipitation tank. Partial pretreated wastewater Q2 directly enters the low oxygen reaction tank, then flows through the short-term aerobic tank and the precipitation tank sequentially, and then is discharged from the precipitation tank. One part of precipitated sludge flows back to the anaerobic tank, and the other part of the precipitated sludge is discharged from the precipitation tank as excess sludge. Mixed liquid return channels are arranged between the low oxygen reaction tank and the anoxic tank, and the mixed liquid return channels are also arranged between the short-term aerobic tank and the low oxygen reaction tank. A returned sludge contact reaction region is arranged on the front end of the anaerobic tank, and water feeding points are arranged both on the front end region and the rear end region of the anaerobic tank. The method has a simple flow, and is adaptable to wastewater quality change, and is capable of removing nitrogen and phosphorus from wastewater with low carbon source and low oxygen consumption. The method is applicable to rebuilding or building of a municipal wastewater treatment plant which has nitrogen and phosphorus removing requirements.

The invention discloses a nitrogen and phosphorus removal method for biological sewage treatment, which is designed aiming at a traditional sewage treatment that a chemical agent needs to be added, the nitrogen and phosphorus removal efficiency is low and the operation cost is high. According to the nitrogen and phosphorus removal method for the biological sewage treatment, a biological tank comprises a pre-anoxic zone, an anaerobic zone, an anoxic zone, an aerobic zone and a facultative zone; the pre-anoxic zone and the facultative zone are increased so that water can be input from a plurality of points; the water conservation staying time of each zone is adjusted and an inner reflowing manner is changed; efficient phosphorus removal strains are used for carrying out nitrogen and phosphorus removal of sewage. According to the nitrogen and phosphorus removal method for the biological sewage treatment, the chemical phosphorus removal medicine does not need to be added so that the operation cost is low and the nitrogen and phosphorus removal efficiency is high; the removing rate of nitrogen and phosphorus in an urban sewage treatment process is improved to 90% so that the sludge reduction ratio reaches 10%.

The invention provides a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment method for solving the frequency problems of high sand content in incoming water, low volatile suspended solid (VSS) / mixed liquor suspended solids (MLSS), inadequate carbon source and the like in the conventional denitrification and dephosphorization process. The system consists of a main waste water treatment system having denitrification and dephosphorization functions and a bypass system, wherein the main waste water treatment system comprises a grit chamber and a waste water treatment system having denitrification and dephosphorization functions; and the bypass system consists of a hair separator, a sludge reduction pool, a sludge and silt separator, a silt dewatering system and a chemical dephosphorization system. In the invention, by discharging the sludge and silt and retaining slit organic matters, the silt is prevented from depositing in the waste water treatment system and the VSS / MISS ratio of the sludge in a biochemical reaction pool is improved. By returning the sludge recycled as a carbon source, a carbon source is provided for the main waste water treatment system. By applying chemical dephosphorization in the embedded bypass system, the phosphorus in urban waste water can be removed and recycled chemically at low cost.

The invention discloses a denitrification and dephosphorization filler for sewage and a preparation method thereof. The denitrification and dephosphorization filler for sewage comprises the followingcomponents in parts by weight: 30-50 parts of iron powder, 20-50 parts of carbon powder, 5-10 parts of bentonite, 15-30 parts of cement, 20-50 parts of modified charcoal and 20-40 parts of a solid carbon source. The preparation method comprises the following steps: preparation of the modified charcoal; preparation of the solid carbon source; mixing; granulating; and drying. The denitrification anddephosphorization filler for sewage has good nitrogen and phosphorus removal efficiency and a stable structure; and the preparation method is simple and has low cost, and the prepared filler has goodapplication prospects.

The invention discloses a method for producing short-chain volatile fatty acids by utilizing kitchen wastes and the short-chain volatile fatty acids. The method specifically comprises the following steps: uniformly mixing and stirring the kitchen wastes serving as a fermentation substrate and sludge serving as an inoculum, thereby obtaining a fermentation matrix; and adding alkyl polyglucosides into the fermentation matrix, and performing anaerobic fermentation under a stirring condition. The reduction, recycling and innocent treatment of the kitchen wastes are realized, and the method has the advantages of low operating cost, high profit, high yield of the short-chain volatile fatty acids and the like.

The invention belongs to the field of water environment governance and particularly relates to a bacterium-alga filler strengthened combined type ecological floating bed and a water body purificationmethod therefor. The bacterium-alga filler strengthened combined type ecological floating bed comprises a filtering device, a purifying device and a strengthened adsorbing device which are arranged sequentially according to a water flow direction, so as to form a preliminary filtering-efficient purifying-advanced strengthened treatment repair process, and the water quality of water body can be effectively improved from an upstream to a downstream; the purifying device comprises an emergent-plant bed, a suspending filler layer, a microporous aerating layer, a submerged plant layer and an immobilized bacterium-alga filler layer which are arranged sequentially from top to bottom, the microporous aerating layer serves as a limit, an aerobic zone is formed upwards, and a hypoxic-anaerobic zoneis formed downwards through gradual transition; and due to spatial changes of aerobic-hypoxic-anaerobic and the characteristic that the immobilized bacterium-alga filler layer is rich in high-activitymicroorganisms, the proceeding of nitration and denitration reactions is strengthened, the efficiency of denitrification and dephosphorization of the ecological floating bed is increased, lower-layerspace of the water body is effectively utilized, and thus, the water surface-to-underwater depth type governance and repair of the water body is achieved.

The invention provides a ceramic filler for wastewater treatment, a production method for the ceramic filler and a wastewater treatment device. Through adoption of the ceramic filler for the wastewater treatment, problems that the improvement of the nitrogen and phosphorus removal efficiency is difficult, the sludge amount is large and the follow-up sludge treatment cost is high, which are caused by low carbon source utilization rate of conventional spherical light ceramic particles, are solved. The ceramic filler comprises a ceramic particle base body in which micro-holes communicated with the outer side are distributed, and is characterized in that carbon sources are filled in the micro-holes; the outer periphery of the ceramic particle base body is coated with a coating used for sealing the carbon sources in the micro-holes. In addition, the invention further provides the production method for the filler and the wastewater treatment device employing the filler.

The invention provides a V-shape air-stripping technology for removing nitrogen and phosphorus of large and medium-sized sewage processing. The technology comprises following steps: introducing sewage, subjecting the sewage to go through a coarse screen to remove the slag, then adding water, lifting by a sewage pump, subjecting the sewage to a fine screen, transporting the sewage to a sand settling pool, transporting the sewage to a hydrolysis acidification pool, transporting the sewage to an integral processing pool of V-shape air stripping reflux and two-grade precipitation, transporting the sewage to a disinfecting pool and finally discharging the sewage if the quality of the sewage meets the standard. In the technology, the integral sewage processing pool of V-shape air stripping reflux and two-grade precipitation substitutes the biochemical reaction pool of A / A / O activated sludge process, the nitrated liquid internal reflux pump pool, the secondary precipitation pool, the sludge internal influx and external influx pump pool, the coagulation reaction pool and the inclined tube precipitation pool, and thus the high efficiency and compactness of removing nitrogen and phosphorus in sewage are achieved. Compared to the conventional processing technology, the V-shape air-stripping technology has the advantages of small occupied area, low investment, little drug consumption, little sludge discharge, low energy consumption, low cost, stable and controllable water quality, and convenient operation management.

The invention discloses a device and a method for realizing sludge digestion fluid short-cut nitrification of continuous flow suspending media. The device is provided with a raw water tank, a denitrification filtering column, a suspending media reactor, a secondary basin and a water outlet tank, wherein the raw water tank is an open casing, the denitrification filtering column is a cylindrical tube, cubic suspending sponge filling materials are filled in the denitrification filtering column, the suspending media reactor is an open basin body with inner cavity divided into a plurality of grid chambers, cubic suspending sponge filling materials are filled in the grid chambers, further the suspending media reactor is equipped with a gas pump, a gas flow meter and an aerated conduit, the secondary basin is a column, and the water outlet tank is a open casing. The method for realizing sludge digestion fluid short-cut nitrification comprises starting the system and adjusting operation in running. The device and the method can save a large amount of denitrification carbon sources, increase denitrogenation efficiency of sewage disposal plants, and achieve the purpose of saving energy and lowering energy consumption.

The invention discloses a dual-sludge denitrification dephosphorizing and denitrifying A / A-O device which mainly comprises a primary precipitation pool, an anaerobic-anoxic device, a secondary precipitation pool, a middle pool, a biological aerated filter and a clear water pool, wherein the primary precipitation pool is connected with an anaerobic zone of the anaerobic-anoxic device, a degassing zone of the anaerobic-anoxic device is connected with the secondary precipitation pool, and the secondary precipitation pool is connected with the anaerobic zone of the anaerobic-anoxic device througha sludge pump; the outflow water of the secondary precipitation pool is connected to the middle pool, the middle pool is connected with the biological aerated filter, and the biological aerated filter is connected with the clear water pool; and the clear water pool is connected with the anaerobic-anoxic device. By the process adjustment, denitrifying phosphorus accumulating bacteria becomes dominant bacteria of an AAO unit. The dual-sludge denitrification dephosphorizing and denitrifying A / A-O device realizes the separation of phosphorus accumulating bacteria and nitrobacteria, the separationof the precipitation function and the sludge storage function of the secondary precipitation pool, and the separation of the nitrification function and the filtering function of the biological aerated filter, thereby realizing energy conservation of a combined system, stability and efficiency in denitrification and dephosphorization, and sludge reduction.

An artificial wetland waste water pretreatment method for small-town waste water treatment aims at overcoming the defects that in the prior art, the water quality of a small-town waste water treatment system is larger in fluctuations, larger impact is caused on stable running of the treatment system, and the treatment efficiency of an artificial wetland system dramatically declines in winter in the north. The method comprises the steps that 1, waste water enters a grille pool, and interception treatment is conducted; 2, treated waste water enters a biological selection area; 3, the treated waste water enters a biological reaction area, activated sludge degrades pollutants such as organic matter, nitrogen and phosphorus which exist in the domestic waste water, and an aerating system automatically controls dissolved oxygen concentrations of different zones of the biological reaction area; 4, the treated waste water enters a coagu-flocculation reaction area, and a coagu-flocculation reaction is conducted after flocculating agents are added; 5, the treated waste water enters a settling zone, and settling sludge partially back flows to the biological selection area; 6, residual sludge enters a sludge concentration area; 7, the waste water which is treated in the fifth step enters an artificial wetland. The artificial wetland waste water pretreatment method for the small-town waste water treatment improves the anti-impact capacity of the system and is suitable for being used in the environment of small-town waste water with larger fluctuations in the water quality.

The invention relates to a method for reinforcing nitrogen and phosphorous removal from sewage by utilizing anaerobic environment of a pipeline. The method comprises the following specific steps: the municipal sewage enters into an anaerobic tank, an anoxic tank and a first aerobic tank in sequence from a first sewage inflow point, part of the nitration solution at the tail end of the first aerobic tank flows back to the initial end of the anoxic tank, the sludge mixed solution and the sewage entering from a second sewage inflow point are mixed, enter into a sewage pipeline and then enter into a second aerobic tank to complete organic matter degradation and nitration process, and at the same time, the nitration solution flows back to the initial end of a sludge pipeline and enters into a secondary sedimentation tank to undergo sludge and water separation, part of the sludge flows back to the initial end of the anaerobic tank and the residual sludge is discharged, wherein the DO (dissolved oxygen) in the anaerobic tank is controlled below 0.1mg / L; the DO in the anoxic tank is controlled below 0.5mg / L; and the DO in the first aerobic tank and the second aerobic tank is 1.0-2.0mg / L. The process has the beneficial effects of ensuring reasonable hydraulic retention time and proper backflow ratio by controlling two-point inflow, two stages (anaerobic stage and aerobic stage), two-stage nitration solution backflow and the like and achieving the aim of reinforcing the effect of nitrogen and phosphorous removal from sewage aiming at the municipal sewage with low carbon-nitrogen ratio.

The invention provides a small sewage treatment hydrolysis and gas-stripping and precipitation technique method which comprises the following steps of: underground sewage, integrated anaerobic hydrolysis acidifying adjustment lift pump pond, integrated sewage treatment pond for Z type gas-stripping reflux two-stage precipitation, and up-to-standard emission. The anaerobic hydrolysis acidifying adjustment lift pump pond is adopted to replace various conventional and non-conventional comprehensive pretreatment procedures, the integrated sewage treatment pond for Z type gas-stripping reflux two-stage precipitation is adopted to replace procedures of a fine-rack girt chamber, an A / O biochemical reaction basin, a nitration liquid internal-reflux pump basin, a secondary precipitation basin, a sludge internal-reflux pump basin, a sludge external-reflux pump basin, a coagulation-flocculation reaction basin and an inclined-tube precipitation basin, a contact sterilization basin and the like in an A / O activated sludge method. The method has the advantages of being small in occupied space, less in investment and medicine consumption and sludge discharge, low in energy consumption and cost, stable and controllable in water quality, simple and convenient to run and manage, especially suitable for high-efficiency and compact treatment of nitrogen and phosphorus removal of sewage of ten thousand tonnage / per day and below.

The invention relates to an integrated efficient biological reactor and reaction process thereof. The integrated efficient biological reactor comprises an anoxic zone, an anaerobic zone, a hypoxic zone, a hypoxic filling zone, a precipitation zone, a filter cloth filtering zone and a sterilizing zone. The reactor adopts the integrated structure, is compact in overall design and occupies a small area. With adoption of the reaction process, the sewage treatment is low in energy consumption the efficiency is high, partial nitrification, synchronous nitrification and denitrification and denitrifying phosphorus removal are realized, and the treatment efficiency of nitrogen and phosphorus removal is high.

A method and a device for realizing partial shortcut nitrification and anaerobic ammonia oxidation of municipal sewage by sludge fermentation belong to the field of municipal sewage treatment and sewage biological treatment. In a first SBR of a reactor, organics and phosphorus are removed, partial shortcut nitrification and denitrification actions are taken, and phosphorus is removed through real-time DO and pH control and sludge discharge. Effluent of the first SBR of the reactor enters a second SBR of the reactor for anaerobic ammonia oxidation reaction, so that the purpose of deep nitrogen and phosphorus removal is achieved. As residual sludge and domestic wastewater are mixed for treatment, the problem that shortcut nitrification of domestic wastewater cannot be stably realized due to low ammonia concentration can be solved, carbon sources are saved, the nitrogen and phosphorus removal efficiency is improved, and meanwhile, the sludge reduction treatment is realized.

The invention discloses an A<2> / O and MBR combined sewage regenerating process. The sewage is discharged after being sequentially processed by an anaerobic tank, an anoxic pool, an aerobic pool and an MBR membrane pool. The process is characterized by also comprising the steps of deoxidizing a mixed solution inside the MBR membrane pool through a deoxidation pool and then returning to the anaerobic tank or the anoxic pool. The invention also comprises an A<2> / O and MBR combined sewage regenerating device. The improved A<2> / O and MBR combined sewage regenerating process and device disclosed by the invention have the advantages of being high in denitrification and dephosphorization efficiency, stable to run, good in operation flexibility, high in effluent quality, and the like. The effluent can achieve the water quality standard of reclaimed water reuse, and the process is an ideal sewage treatment process combining biological treatment with advanced treatment.

The invention relates to an A2 / O-bio-contact oxidation device and method based on coupling of partial nitrification and denitrifying phosphorous removal and belongs to the field of biological treatment of sewage. The device mainly comprises an A2 / O reactor (comprising an anaerobic zone, an anoxic zone and an aerobic zone), a wobble plate sedimentation tank, a biological contact oxidation tank and a sedimentation zone, wherein the aerobic zone of the A2 / O reactor is connected with the wobble plate sedimentation tank by virtue of an overflow baffle, the wobble plate sedimentation tank is connected with the biological contact oxidation tank, and the biological contact oxidation tank is connected with the sedimentation zone; filler made from carbon fibers is arranged in the biological contact oxidation tank and is mainly used for completing partial nitrification; a sludge reflux pump is communicated with the bottom of the anaerobic zone of the A2 / O reactor, a nitrification liquor reflux pump is connected with an effluent tank and the anoxic zone of the A2 / O reactor to realize denitrifying phosphorus removal. The A2 / O-bio-contact oxidation device and method fully take advantages of partial nitrification and denitrifying phosphorous removal and have the advantages of conservation of carbon source, low aeration rate, low sludge yield and the like.