536results about How to "Reduce aeration" patented technology

The invention discloses an attapulgite clay porous porous ceramsite, a preparation method of the ceramsite, and a purpose of the ceramsite. The ceramsite is prepared from raw materials of attapulgite clay and biomass, and a binder of industrial soluble glass. The ceramsite is prepared through calcining and oxidizing. The attapulgite clay porous ceramsite prepared by the present invention has advantages of high porosity, large specific surface area, high strength, strong water resistance, high water absorption, high catalytic activity, and the like. The porous ceramsite prepared by the presentinvention can be applied as a carrier for a catalyst, and a filling material for an aerated biological filter.

An oil jet assembly includes a body, a tube, a cap insert, a ball, and a spring. The body includes a bore passing longitudinally through the body; a tube aperture passing through the body near a first end of the body; and an opening at a second and opposite end of the body. The tube is attached to the body and in fluid communication with the tube aperture. The cap insert is positioned within the bore of the body. The cap insert includes a bore that passes longitudinally through the cap insert to form a wall. The cap insert also includes an oil exit aperture passing though the wall and is in fluid communication with the bore of the body. The ball and spring are positioned within the bore of the insert cap. The spring is positioned between the ball and the first end of the body.

An internal combustion engine is disclosed which includes an improved crankcase drain back system. A set of drain flow diodes are disposed in each of the drain lines to direct fluid flow in a direction from the head portion to the crankcase. Likewise, a set of breather flow diodes are disposed in the breather lines to direct fluid flow in a second direction from the cylinder portion to the head portion. The flow diodes include a series of stacked flow diode elements which allow flow in one direction, while resisting flow in the opposite direction.

A process for treating sewage by integrating sequential active sludge method with membrane-bioreactor features that the membrane assembly is put in bioreacting pool, its outlet is respectively connected to air inlet pipe and water outlet pipe via two control valves, the whole system sequentially passes through flow-in, reaction, discharge and idle steps, that is, anaerobic, aerobic and anoxic states, and said membrane assembly plays the roles of aerating unit in reaction step or separator in discharge step. Its advantages are simple structure and high effect.

The invention discloses a UBF reactor used for coupled denitriding via anaerobic ammonia oxidation-sulfur-based autotrophic denitrification, and a system and a denitriding method thereof, and belongs to the technical field of waste water processing. The denitriding method is suitable to be used for processing high mmonia nitrogen low C / N waste water, partial nitrification is used for providing all reaction substrates of anaerobic ammonia oxidation, marcasite is used for providing electron donors of sulfur-based autotrophic denitrification; porous limestone is taken as a supporting framework of a limestone filling layer; and nitrite nitrogen generated via nitrosation, and nitrate nitrogen generated via nitrification and anaerobic ammonia oxidation are taken as electron acceptors. The denitriding method is high in ammonium-nitrogen removal rate; operation stability is high; compared with conventional nitration-denitrification denitriding method, the denitriding method possesses following advantages: no extra organic matter is added as the electron donor, marcasite is ued for providing the electron donors of sulfur-based autotrophic denitrification bacteria, cost is low, controllability is high, effluent is stable, sludge yield is low, and energy consumption is low.

The present invention relates to a deep denitrification process and device for domestic sewage without additional carbon source. The present invention is a combination process composed of anaerobic acidification tank, micro-aeration vertical underflow wetland and horizontal underflow wetland. The specific process is as follows: The domestic sewage enters the anaerobic acidification tank; the effluent from the anaerobic tank enters the micro-aeration vertical subsurface flow wetland; the treated sewage from the micro-aeration vertical subsurface flow wetland enters the horizontal subsurface flow constructed wetland. The effluent from horizontal subsurface flow wetlands can be used to supplement static landscape water bodies and other purposes. The present invention controls the ratio of NH4+-N / NO3--N in the horizontal subsurface flow wetland influent to 1-1.4:1 through the adjustment of appropriate process parameters, and the actual BOD5 / N is far lower than the theoretical value of denitrification BOD5 / N Under these conditions, anaerobic ammonium oxidation can be stably realized in constructed wetlands, forming a low-cost, high-removal sewage deep denitrification process. Micro-aeration vertical flow wetlands + horizontal subsurface flow wetlands can be applied to sewage treatment plants. Advanced water treatment can also be used for decentralized domestic sewage treatment. The invention has the advantages of simple structure, low cost and convenient operation and maintenance, and can achieve a TN removal rate of over 95%, stable pollutant removal effect, and effluent water quality up to Class IV standard of surface water.

The invention discloses a treatment method for biological nitrogen removal of reinforced sewage, which comprises the following steps of: 1, feeding all or partial treated sewage and sludge refluxed from a secondary sedimentation tank into a reflux sludge denitrification unit together by adopting division point inflow; 2, feeding the outflow of the reflux sludge denitrification unit and the residual sewage to an anaerobic unit or an anoxic unit; 3, feeding the outflow of the anaerobic unit to the anoxic unit, and refluxing the mixed solution of an aerobic unit to the anoxic unit; 4, feeding the outflow of the anoxic unit to a transition unit; 5, feeding the outflow of the transition unit to the aerobic unit, and refluxing the mixed solution of the aerobic unit to the anoxic unit from the outflow end of the aerobic unit; and 6, feeding the outflow of the aerobic unit to the secondary sedimentation tank to perform sludge-water separation. The method can be operated in multiple modes of A-A2O, nitrogen removal AO, inverse AAO and the like and has high controllability, and a system has strong nitrogen removal capability. The method is suitable for upgrade and reform of newly built sewage treatment plants of towns lacking the land and the conventional sewage treatment plants.

The invention belongs to the technical field of biological sewage treating technique, in particular relates to a continuous flow sewage hypoxia short distance denitrification treating technique. The technique is implemented by a circular flow impelling system, sewage enters into an anaerobic zone through a water inlet pipe, and stays for 50-70min for biological phosphorus release; effluent from the anaerobic zone enters into an anoxic zone and stays for 4-6h with DO value controlled at 0.3-0.7mg / L, and the anoxic zone is provided with a first aeration system to realize anoxia or hypoxia condition to provide conditions for short distance nitrification and denitrification; effluent from the anoxic zone enters into an aerobic zone and stays for 4-6h with DO value controlled at 0.8-1.2mg / L, part of nitrification liquid in the aerobic zone flows back to the anoxic zone with reflux ratio being 0.8-1.5; effluent from the aerobic zone enters into a secondary sedimentation tank for mud-water separation, effluent is discharged at last, part of mud in the secondary sedimentation tank flows back to the anaerobic zone with mud reflux ratio being 0.5-0.8; the aerobic zone is provided with a second aeration system to complete organism degradation and nitrification processes. In the invention, dissolved oxygen, pH and the like are controlled, a hypoxia zone is formed in the anoxic zone, and technologies such as hypoxia short distance nitrification and denitrification, denitrification dephosphorization and the like are utilized, thus realizing the aim of efficiently removing nitrogen and phosphorus from continuous flow activated sludge with energy being saved.

The invention discloses a low-carbon urban sewage biological phosphorus removal and autotrophic biological nitrogen removal device and a low-carbon urban sewage biological phosphorus removal and autotrophic biological nitrogen removal method. The device comprises a raw water tank, a biological phosphorus removal and half shortcut nitrification reactor, a secondary sedimentation tank, an intermediate water tank and an anammox reactor, wherein the biological phosphorus removal and half shortcut nitrification reactor is a university of cape town (UCT) reactor without internal returning of digestive fluid; the secondary secondary sedimentation tank is a radial-flow sedimentation tank; and the anammox reactor is an upflow anaerobic sludge blanket (UASB) reactor. The method comprises: introducing urban sewage first to the anaerobic zone of the biological phosphorus removal and half shortcut nitrification reactor for phosphorus release, then to an anoxic zone of the biological phosphorus removal and half shortcut nitrification reactor for denitrification and phosphorus absorption and finally to an aerobic zone for aerobic phosphorus absorption and half shortcut nitrification; subjecting mixed liquid containing ammonia nitrogen and nitrite nitrogen to sludge and water separation in the secondary sedimentation tank; and introducing the water to the anammox UASB reactor for autotrophic biological nitrogen removal under anammox action. When the method is used, process aeration can be reduced, energy consumption can be reduced, and carbon source is saved. The method is suitable for treating low-carbon sewage.

The invention provides a process for treating domestic sewage with low CN (Carbon-Nitrogen) ratio by use of an anaerobic / aerobic SNDPR (Simultaneous Nitrification and Denitrification Phosphorus Removal) system capable of enriching phosphorus-accumulating bacteria and belongs to the field of biological sewage treatment. After the domestic sewage enters into an SNDPR SBR (Sequencing Batch Reactor), delayed anoxic / anaerobic stirring is carried out firstly, nitrogen removal by denitrification is performed on NO3<-1>-N and NO2<-1>-N left in last cycle by use of denitrifying bacteria and by utilizing organic carbon sources in the sewage, the anaerobic phosphorus release is realized by use of the phosphorus-accumulating bacteria and by utilizing the organic carbon sources in the sewage, and stored substances are synthesized in the cells of the phosphorus-accumulating bacteria. Due to delayed anaerobic treatment, after PAOs phosphorus release is finished, the denitrifying flora in the system is still capable of taking full advantage of organic matters in the sewage and storing the organic matters as an internal carbon source. Hereafter, aerobic aeration stirring is performed; as the concentration of dissolved oxygen is controlled, endogenous SNDPR of the denitrifying flora can be realized while phosphorus absorption of the phosphorus-accumulating bacteria is guaranteed. The method process for treating the domestic sewage with low CN ratio by use of the anaerobic / aerobic SNDPR system capable of enriching phosphorus-accumulating bacteria has the advantages that deep nitrogen and phosphorus removal of the sewage with low CN ratio is realized in one reactor, the process is simple, no external carbon source needs to be added, and the oxygen consumption and the energy consumption are reduced.

The invention discloses a continuous flow urban sewage partial nitrification and anaerobic ammonia oxidation denitrification method and belongs to the field of sewage. The method comprises the following steps of: allowing urban sewage to enter a biological adsorption reactor, adsorbing organic matters in water to activated sludge through the adsorption action of the activated sludge, and carrying out denitrification and anaerobic ammonia oxidation in an anoxic area of a partial nitrification anaerobic ammonia oxidation reactor to remove residual organic matters in water and nitrate nitrogen in return sludge; carrying out the partial nitrification in an aerobic area, and carrying out the anaerobic ammonia oxidation action in the anoxic area; repeating the actions in the aerobic area and the anoxic area; and finally, fulfilling the aim of removing nitrogen from the sludge.

The invention relates to an A2N-SBR (anaerobic-anoxic / nitrification-sequencing batch reactor) process with a shortcut nitrification-denitrification denitrifying and dephosphorizing function. Compared with an A2N-SBR process with a complete nitrification-denitrification denitrifying and dephosphorizing function, the A2N-SBR process provided by the invention saves aeration amount and organic carbonsource amount, greatly reduces residual sludge amount and saves operation cost. The A2N-SBR process provided by the invention comprises a main reaction tank and auxiliary equipment, wherein the main reaction tank comprises an A2-SBR and an N-SBR; and the auxiliary equipment comprises stirring equipment, aeration equipment, a dissolved oxygen detection device, a reflux pump, pH adjusting equipment, a pH detection device, heating equipment and a temperature detection device. The A2N-SBR process provided by the invention has the advantages that: two independent SBRs are adopted; nitrite bacteriaand denitrifying phosphate-accumulating bacteria grow separately in the two reactors through controlling proper conditions, so that denitrification is carried out when NH4<+>-N oxidation goes to NO2<-> stage, thus operation energy consumption is greatly saved, bacteria are not mutually influenced in the operation process, and the bacterial activity is higher in the whole bacterial growth process;and the process is simple, the arrangement is compact and the automation degree is high.

The invention discloses a device and a method for sectional water inlet A2 / O process intensified biological nitrogen and phosphorus removal, and belongs to the field of sewage treatment. The device consists of a raw water tank (1), a sectional water inlet A2 / O tank (6) and a secondary sedimentation tank (14) which are connected in sequence. The method comprises the following steps: by feeding packing with anaerobic ammonium oxidation bacteria into anoxic zones and controlling a raw water C / N ratio and average hydraulic retention time of the anoxic zones, performing phosphorus dilution of an anaerobic zone (8), performing phosphorus absorption of an aerobic zone (10), and performing denitrification through partial denitrification anaerobic ammonia oxidation reaction on anaerobic ammonium oxidation bacteria on the packing of a first anoxic zone (9) by using nitrate nitrogen in recycled nitrification liquor and ammonia nitrogen in fed water; controlling dissolved oxygen of a first aerobic zone (10) to achieve semi-partial nitrification, providing a substrate nitrous to denitrification and anaerobic ammonia oxidation with nitrous as a substrate in a second anoxic zone (11), and performing whole-process nitration reaction and aerobic phosphorus accumulation reaction in an aerobic zone (12), thereby achieving nitrogen and phosphorus removal of municipal sewage, wherein the ammonia nitrogen used in the device and the method is provided from residual semi-partial nitrification ammonia nitrogen and second-stage fed water.

The invention relates to a biomembrane reactor with non-foaming oxygen supply of a membrane carrier and a method for treating organic wastewater, which belongs to a technique for treating wastewater. The biomembrane reactor with non-foaming oxygen supply of the membrane carrier comprises a hollow membrane component of a curtain type. The process of treating wastewater by applying the biomembrane reactor with non-foaming oxygen supply of the membrane carrier comprises the following steps: the hollow membrane component of a curtain type is arranged in a wastewater pond; air is lead in through an inlet pipe; oxygen in the air permeates a hollow fiber membrane of oxygen permeation and enters the biomembrane attached on the hollowing fiber membrane of oxygen permeation; organic wastewater after settled flows through the surface of the biomembrane attached on the hollowing fiber membrane with a certain flow rate; microorganisms on the hollow fiber membrane decompose organic matters, so the content of organic matters in the water is gradually decreased; when the index of the organic matters reaches the requirement of wastewater discharge, the wastewater is discharged through a water outlet. The biomembrane reactor with non-foaming oxygen supply of the membrane carrier has the advantages of high utilization of oxygen, small amount of required aeration, energy conservation, and easy control of transferring efficiency.

The invention discloses a denitrifying phosphorus removal-anammox-shortcut nitrification integrated baffled reaction equipment, relating to a wastewater treatment device. The equipment disclosed by the invention is baffled reaction equipment which is suitable for achieving decarbonizing and denitriding and dephosphorization synchronously for wastewater with a low carbon-nitrogen ratio and wastewater with a high carbon-nitrogen-phosphorus concentration. The integrated baffled reaction equipment makes use of the biofacies separation characteristic and achieves coupling microorganisms with denitrifying phosphorus removal, anammox and shortcut nitrification functions through a backflow device and an aerating device so as to achieve decarbonizing and denitriding and dephosphorization synchronously for the wastewater with the low carbon-nitrogen ratio and wastewater with the high carbon-nitrogen-phosphorus concentration, and reduce organic carbon source consumption amount in the treatment process to a lower level to largely reduce produced surplus sludge. Packing layers are arranged in autotrophic functional microorganism cells to raise biological holding volume for the system. The device has advantages of simple structure, multifunction, low consumption and high efficiency, easy operation and management, stable operation and so on. The device can also achieve decarbonizing and denitriding and dephosphorization synchronously.

The invention provides a continuous flow low C / N (carbon / nitrogen ratio) municipal wastewater partial nitrification / anaerobic ammonia oxidation and denitrification nitrogen removal method, and belongs to the field of wastewater. The continuous flow low C / N municipal wastewater partial nitrification / anaerobic ammonia oxidation and denitrification nitrogen removal method is characterized in that firstly municipal wastewater enters an oxygen deficiency denitrification zone of a biological nitrogen removal reactor, heterotrophic denitrifying bacteria fixed on biological stuffing use organic matters in raw water as carbon sources and restore nitrate nitrogen in backflow yielding water to nitrogen, then the wastewater enters an aerobic zone and is subjected to partial nitrification reaction, so that a part of ammonia nitrogen is converted to nitrite nitrogen, afterwards the wastewater enters an oxygen deficiency zone, and anaerobic ammonium oxidation bacteria fixed on the biological stuffing convert the part of ammonia nitrogen and the nitrite nitrogen into nitrogen; and afterwards, the wastewater sequentially enters a subsequent aerobic zone and a subsequent oxygen deficiency zone, so that the effects are repeated, and the purpose of removing the nitrogen in the wastewater is achieved in the end. The continuous flow low C / N municipal wastewater partial nitrification / anaerobic ammonia oxidation and denitrification nitrogen removal method can realize the deep denitrification of low C / N municipal wastewater without addition of an external carbon source and has the characteristics of high nitrogen removal efficiency, low sludge yield and the like.

The invention relates to a municipal sewage partial nitrification and anaerobic ammonia oxidation denitrification method capable of enhancing energy recuperation, and belongs to the field of sewage treatment. According to the invention, municipal sewage enters a biosorption reactor at first, organic matter in the sewage is absorbed into activated sludge through the absorption effect of the activated sludge, then the municipal sewage enters an SBR (Sequencing Batch Reactor Activated Sludge Process) reactor, and through the alternate operation of low oxygen aeration and anaerobic agitation, the autotrophic nitrogen removal of the partial nitrification and the anaerobic ammonia oxidation is realized, so that the energy recuperation efficiency of the sewage treatment is improved, and the operation energy consumption of the sewage treatment is lowered.

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 two-stage backflow simultaneous nitrogen and phosphorus removal device and technology for denitrification phosphorus removal, shortcut nitrification and anaerobic ammonia oxidation of municipal sewage, and belongs to the field of sewage treatment. Municipal sewage enters an anaerobic / anoxic reactor after passing through a regulating reservoir; phosphorus-accumulating bacteria finish storage and phosphorus release of polyhydroxybutyrate (PHB) by using inflow chemical oxygen demand (COD) under an anaerobic condition; phosphorus-rich supernatant enters inside a middle reservoir through a water decanter, and is injected into a moving bed membrane bioreactor by a lift pump after the water quantity is adjusted; autotrophic nitrogen removal of the shortcut nitrification and anaerobic ammonia oxidation is achieved by alternate operation of low-oxygen aeration and anoxic agitation; the processed effluent enters the anaerobic / anoxic reactor again under the action of a suction pump; denitrification phosphorus removal is achieved after phosphorus-accumulating sludge containing the PHB and autotrophic denitrification effluent containing nitrate nitrogen are mixed. Simultaneous nitrogen and phosphorus removal of low-carbon municipal sewage is achieved by using coupling of three functional microorganisms for denitrification phosphorus removal, shortcut nitrification and anaerobic ammonia oxidation, and the two-stage backflow simultaneous nitrogen and phosphorus removal device has the advantages of being high-efficiency and energy-efficient, stable to run, and low in sludge yield.

A recycling treatment method for feces and wastewater in a large-scale livestock and poultry breeding farm includes the following steps: (1) pre-treating the feces and wastewater in the large-scale livestock and poultry breeding farm in a pretreatment unit to form slurry; (2) feeding the slurry into an energy recovery unit, and performing solid anaerobic digestion in a solid anaerobic reactor to obtain an energy gas, methane; (3) performing solid-liquid separation to the digested slurry to generate wastewater, which is then fed into a UASB reactor to perform further anaerobic fermentation to remove organic pollutants from the wastewater; (4) feeding the treated wastewater into a nitrogen and phosphorus removal unit to perform nitrogen and phosphorus removal treatment; (5) separating and purifying a precipitate, which is generated in the nitrogen and phosphorus removal unit and mainly includes magnesium ammonium phosphate, to obtain an organic fertilizer additive, wherein the nitrogen removal process is autotrophic nitrogen removal and can reduce aeration quantity by 62.5% without addition of any carbon sources, thus saving large quantity of operation cost; and (6) feeding the treated wastewater into a deep-treatment unit to remove bio-refractory substances and disinfect the wastewater so as to finally reach emission and recovery standards of wastewater.

The invention discloses a membrane bio-reactor (MBR) used for treating preserved szechuan pickle wastewater and reinforcing biological phosphorous and nitrogen removal. An integrated reactor is formed by an A<2> / O process, a biological membrane process and the MBR. The MBR comprises an anaerobic tank, an anoxic tank, an aerobic tank, a feeding system, an aerating system, a drainage system and automatic control equipment, wherein semi-soft biological membrane fillers are put in the anaerobic tank, the anoxic tank and the aerobic tank; a membrane component is put in the aerobic tank, and a membrane separation region is not independently arranged. The reactor has the advantages that anaerobic phosphorus release and phosphorus accumulation in the aerobic tank are carried out via the sludge on the biological fillers in the anaerobic tank, thus increasing the total removal rate of phosphorus in the sewage; organic matters undergo hydrolytic acidification and organic nitrogen is aminated after the preserved szechuan pickle wastewater passes through the anaerobic tank; nitrification liquor in the aerobic tank flows back to the anoxic tank to form denitrification in the anoxic tank. The MBR has a simple structure and high pollutant treatment efficiency, is light in membrane pollution, and can simultaneously treat the pollutants such as organic matters, total nitrogen, total phosphorus, SS and the like of high salinity wastewater.

The invention discloses a granule sludge and biological film coupled integrated sewage treatment method and a treatment device suitable for the same. A reactor is internally filled with granule sludge, suspended sludge and filler, wherein a biological film is formed on the filler; the granule sludge is coupled with the suspended sludge and the biological film by utilizing the high efficiency of the granule sludge; meanwhile, a micro-aerobic aeration environment is provided at a proper position in the reactor, and an anaerobic region, an anoxic region and an aerobic region are formed in the reactor, so that an anaerobic microenvironment, an anoxic microenvironment and an aerobic microenvironment are coupled; in addition, the double circulation that part of sludge in the anaerobic region returns to the aerobic region and part of sludge in the aerobic region returns to the anaerobic region is provided, and a proper quantity of sludge in the aerobic region is discharged, so that the synchronous and efficient removal of COD, N, P and the like in sewage is finally realized.

The invention discloses real-time control device and method for the deep denitrification and dephosphorization of an A2 / O-BAF (Biological Aerated Filter) process. The A2 / O-BAF real-time control device mainly comprises a raw water tank (1), an A2 / O reactor (2), a secondary sedimentation tank (3), a BAF reactor (4) and a real-time control system (5). The real-time control method comprises the following steps of: collecting the concentrations of ammonia and nitrogen in a water outlet tank on line and obtaining a real-time control variable through the operation of a computer; adjusting the aeration amount of an air pump through a stroke controller; collecting the concentration of nitrate nitrogen in the water outlet tank on line and obtaining a real-time control variable through the operationof the computer; adjusting the reflux ratio of a peristaltic pump through the stroke controller; collecting the concentration of TP in the water outlet tank on line and obtaining a real-time control variable through the operation of the computer; and adjusting the reflux ratio of the peristaltic pump through the stroke controller. The invention overcomes the limitations of a traditional biological phosphorus and nitrogen removal process of sewage and is one of the most effective methods for the synchronous phosphorus and nitrogen removal of C / N sewage.

The present invention relates to genetic engineering of production microorganisms used in biotechnology to improve their properties so that they produce useful products more efficiently. The microorganisms express at least one enzyme that causes the functional coupling of the oxidation and reduction of substrates by two pyridine nucleotide-linked dehydrogenase reactions with different specificities for the NAD / NADH and NADP / NADPH coenzyme couples and so facilitates the transfer of electrons between the two coenzyme couples through the said substrates. In particular the invention relates to increasing the yields of products such as ethanol or amino acids from carbon and nitrogen sources such as biomass comprising hexoes, pentoses or their polymers.

The invention discloses a high-flux contamination-resisting type flat membrane bioreactor and a flat MBR (Membrane Bioreactor) device. The flat membrane bioreactor comprises an aerating box, at least two membrane boxes and at least two water collecting tubes, wherein the aerating box is provided with an aerating tube for supplying gas to the aerating box; one end of the aerating tube extends into the aerating box; the at least two membrane boxes are overlapped on the aerating box along the vertical direction; two adjacent membrane boxes are connected with each other; the aerating box is connected with the downmost membrane box; each of the membrane boxes comprises a frame and multiple flat membrane elements arranged in the frame at intervals; a water purifying space is defined in each flat membrane element; each flat membrane element is provided with a water-generating tube communicated with the corresponding water purifying space; the at least two water collecting tubes respectively correspond to the at least two membrane boxes one by one; each water collecting tube is connected with the water-generating tubes of the multiple flat membrane elements in the corresponding membrane box. According to the high-flux contamination-resisting type flat membrane bioreactor disclosed by the invention, the high-flux contamination-resisting type flat membrane bioreactor has the characteristics of high flux, excellent contamination-resisting performance, long service life and low cost.

The invention belongs to the technical field of sewage treatment, and relates to a parallel anaerobic-anoxic-oxic (A2O)-membrane bioreactor (MBR) denitrifying phosphorus removal method. Adopted devices comprise an oxic tank, an anaerobic tank, an anoxic tank and a membrane tank, wherein the oxic tank is connected in parallel with the anaerobic tank; sewage to be treated and external reflux sludge are mixed in a distribution well and flow into the oxic tank and the anaerobic tank according to a proper proportion respectively, and internal reflux mixed liquid which reflows from the anoxic tank also flows into the oxic tank simultaneously; sewage which flows out of the oxic tank and sewage which flows out of the anaerobic tank are mixed and flow into the anoxic tank together for denitrifying phosphorus removal; and the sewage enters an MBR tank for sludge and water separation, and a part of residual sludge serves as the external reflux sludge to be fed into the distribution well. The parallel A2O-MBR denitrifying phosphorus removal method can be used for the new construction and modification engineering of a biological denitrifying phosphorus removal sewage plant, the volume and the aeration amount of an aeration tank can be reduced, and a secondary sedimentation tank can be eliminated simultaneously, so that the floor space of an urban sewage plant is reduced.

The invention relates to a sewage treatment system based on an artificially intensified ecological filtering bed and application of the sewage treatment system. The sewage treatment system consists of grids, an oxygen-enriched pool, an ecological filtration bed, oxygen-enriched plants, an aeration system, a variable water level regulation system and a water collection canal, wherein the bottoms of the oxygen-enriched pool and the ecological filtration bed are respectively provided with an aeration pipe connected with a fan and ecological padding with the inner filling diameter of the ecological filtration bed of 8-16 cm; and the variable water level regulation system in the water collection pool can regulate the water conservancy load of the filtering bed. By using the sewage treatment device designed by the invention, an aerobic area and an aerobic area are formed in the same filtration bed through opening and closing of the aeration pipe, nitrifying and denitrifying processes are completed in the same filtration bed, thus the sewage treatment device has an efficient denitrification capability. According to the invention, oxygen-enrichment is carried out through a root system of a plant, and energy consumption and back wash frequency are greatly reduced while forming an efficient denitrification capability.

The invention relates to a high efficiency screening method for aerobic denitrifying bacteria. The invention includes the following steps: a. enriching bacteria employing domesticating anaerobic denitrifying sludge, b. separating and purifying domesticated bacteria from sludge using plate dilution method and plate streak method, c. preliminary screening for pure bacteria after separation and purification, obtaining bacteria with 50% TN removal rate, d. screening bacteria again, obtaining aerobic denitrifying bacteria. Accomplishment of aerobic denitrifying technology can not only overcome the shortcomings of traditional biological denitrification technology, but possess the following advantages: (1) can accomplishing denitrification, COD removal in same reactor, (2) shortening retention time under feedback regulation, (3) diminishing aeration volume, (4)alkaline denitrification produced can neutralizing with acid produced in nitration helping to realizing short range synchronous nitration and denitrification.

The invention provides a room temperature nitrosation-anaerobic ammoxidation coupling symbiotic denitrification device for municipal sewage and a sewage treatment method and relates to a sewage treatment method, solving the technical problems that in the existing nitration-anaerobic ammoxidation process, occupied area is large and operation cost is high. The method comprises the following steps of: carrying out film formation with an intermittent film formation mode; introducing municipal sewage; completing the removal of COD (chemical oxygen demand) in the outer barrel and generating a small amount of NO2<-1>-N; and introducing mixed sludge subjected to nitrosation and anaerobic ammoxidation into the outer barrel so as to realize nitrosation-anaerobic ammoxidation coupling symbiotic denitrification. According to the invention, a continuous operation mode is adopted for the device; the device is small in occupied area, and the effective volume of a structure is reduced; and the device is simple and convenient in management, high in treatment efficiency, low in operation cost and the like, and specifically aims at domestic sewage having the characteristics of low substrate concentration and large water yield.