36results about How to "Improve nitrogen removal rate" patented technology

The invention relates to a method for removing SO2, NOx, heavy metal and particle of waste gas, wherein it comprises: using the common-temperature absorb liquid of nitrifying bacteria and sulfur oxidizing bacteria, in the biological absorb tower A, to be reacted with the waste gas, to transfer SO2, NOx, heavy metal and particle to liquid phase; then feeding the liquid and electric carrier to the anaerobic reactor B; under the condition that the pH value is 6.0-9.5, the temperature is 45-65Deg. C and the CODGr / S is 2-10, reducing sulfur into passive-two sulfur, reducing nitrogen into nitrogen gas, and transforming the heavy metal into sulfide deposition; then feeding the reacted water to the aerobic reactor C; under the condition that the pH value is 6.0-9.5, the temperature is 20-40Deg. C and the dissolved oxygen is 1.5-5mg / L, oxygenizing the sulfur selectively into single sulfur; the liquid separated from single sulfur is refluxed as the absorb liquid; for confirming there is enough nitrifying bacteria in the absorb liquid, keeping adding nitrifying bacteria.

The invention discloses a harmless treatment method and device for aluminum ash residues, wherein the aluminum ash residues comprise aluminum nitride. The harmless treatment method comprises the stepsthat water and a reactant are added into the aluminum ash residues for a nitrogen removal reaction to obtain aluminum ash residue turbid liquid, wherein the aluminum ash residue turbid liquid comprises ammonium salts and aluminum ash residues subjected to nitrogen removal, and the reactant comprises one or more of hydrogen peroxide, peracetic acid, calcium oxide, sodium carbonate, acetic acid anddilute sulfuric acid. According to the harmless treatment method and device for the aluminum ash residues, ammonia gas is avoided, the phenomenon that aluminum nitride is coated with aluminum hydroxide is avoided, the nitrogen removal rate is increased, and then the aluminum nitride in the aluminum ash residues is efficiently removed in a low-cost and harmless mode.

The invention relates to a treating method for ammonia-containing wastewater. The treating method comprises the following steps: with activated sludge as a carrier, feeding a growth promoter M under the condition that MLSS is 1000 to 2000 mg / L and controlling DO to be 2.0 to 4.0 mg / L; when the removal rate of ammonia nitrogen reaches 50 to 70%, adding a denitrification microbial agent and a growthpromoter N and reducing DO to 1.0 to 2.0 mg / L; and when the removal rate of ammonia nitrogen reaches 80% or more, lowering DO to 0.1 to 1.0 mg / L, wherein the growth promoter M comprises at least oneselected from a group consisting of trehalose lipid, sophorolipid and rhamnolipid, and the growth promoter N comprises glycolipid, sugar alcohol and an organic acid salt. According to the treating method, the specific denitrification microbial agent and different growth promoters are added into a wastewater treatment system and the concentration of dissolved oxygen is controlled, so high-efficiency removal ammonia nitrogen and total nitrogen in a same reactor is realized, persistent organic pollutants in wastewater can be removed, and the quality of effluent is improved.

The invention provides an autotrophic denitrification deep denitrification device, and belongs to the technical field of wastewater deep denitrification. The device comprises an adjusting tank, a reactor and a sedimentation tank; a sludge discharge area is arranged at the bottom end in the reactor; a water distribution pipe is arranged above the sludge discharge area; a filter screen is arranged between the sludge discharge area and the water distribution pipe; a reaction area is arranged on the water distribution pipe; and a gas collection area is arranged above the reaction area. According to the device, an autotrophic denitrification biological filter bed is constructed, and types and proportions of fillers in the reaction area are optimized. The invention also discloses an autotrophicdenitrification deep denitrification method. The method optimizes the operation mode and operation condition and improves biological activity and denitrification capacity of autotrophic denitrification bacteria in a system, so that the starting time is shortened, and the denitrification effect of the system is enhanced. The autotrophic denitrification deep denitrification device has the characteristics of low energy consumption, quick reaction, no secondary pollution and the like, and solves the problems of long starting time, high sulfate radical concentration of outlet water, easy blockage,easy sulfur outflow and the like of an existing autotrophic denitrification technology in a process of treating low-carbon-source sewage.

The invention relates to the technical field of environmental engineering and aims to provide a zero emission treatment device and method for late-stage landfill leachate. The device and method can improve overall reaction efficiency of partial nitrification-anaerobic ammonia oxidation, realize zero emission treatment of the landfill leachate and remove phosphorus, organic matters and heavy metalions in the landfill leachate. According to the technical scheme, the zero emission treatment device for late-stage landfill leachate is characterized by comprising a regulating tank unit, a partial nitrification-anaerobic ammonia oxidation integrated reactor unit, a carbonization tank unit, a denitrification tank unit, a spirulina-nitrification tank unit, a sedimentation tank, a membrane filtration system unit and an intelligent control system, wherein the partial nitrification-anaerobic ammonia oxidation integrated reactor unit comprises a partial nitrification tank unit and an anaerobic ammonia oxidation reactor unit; the spirulina-nitrification tank unit comprises a spirulina tank unit and a nitrification tank unit; the membrane filtration system unit comprises a microfilter, a nanofilter and an ultrafilter.

The invention discloses a verdigris pseudomonas aeruginosa strain denitrified under different dissolved oxygen conditions and the application thereof and also discloses a microbiological bacterial inoculum for biological denitrification. The pseudomonas aeruginosa HD4-2 provided by the invention was preserved in CGMCC (China General Microbiological Collection Center) on Jan. 21 in 2010 and has a preservation number of CGMCC No.3602. The strain can remove ammonia nitrogen under anoxic, micro-aerobic and aerobic conditions with the removal rate over 95%, can independently finish the whole process of biological denitrification without the accumulation of nitrite nitrogen and nitric nitrogen and has higher potential application values in practice.

The invention discloses a method for performing biological denitrification nitrogen removal by taking LDHs as a slow-release carbon source. The layered double hydroxides serve as slow-release carbon source materials of a matrix and can be used as a carbon source supplement in the biological denitrification nitrogen removal process of sewage. The slow-release carbon source materials are composed of the LDHs intercalated with acetate moieties, and the denitrification carbon source which can be controllably and slowly released is synthesized through the anionic exchangeability of the LDHs and the property that the surface carries positive charges. The synthesized slow-release carbon source materials have the good mechanical property and biocompatibility, can gather microorganisms, increase the biomass of the unit area and improve the nitrogen removal rate and are suitable for the biological denitrification process of the sewage with the low carbon nitrogen ratio, the 6-h nitrogen removal efficiency is more than 96 percent, the effluent TOC is smaller than 5.5 mg / L, and the secondary pollution problem caused when an external carbon source is directly put can be effectively avoided. Accordingly, Ac-LDH can become a novel slow-release carbon source material with the great potential.

The invention discloses an aerobic synchronous nitrification and denitrification biofilm process for treating nitrogen-polluted water. A biofilm carrier is prepared and cultured to obtain a synchronous nitrification and denitrification biofilm, wherein the biofilm carrier is prepared from 70-80% of a degradable fiber carrier and 20-30% of a modified mussel shell. The biofilm process disclosed by the invention has the beneficial effects that based on the property of a solid phase carrier for slow release of a carbon source, the control capability to the carbon source is good, physical and chemical adsorption capabilities are good, the biofilm formation speed is highfast, and the formed biofilm has a large specific surface area. According to the Tthe formed gelatinous biofilm, is characterized in that a dissolved oxygen gradient is gradually formed from the surface to the inside, the surface of the gelatinous biofilm is in an aerobic state, the middle part is facultative, the inside isin an anaerobic state, and thus a relatively independent aerobic-facultative-anaerobic unit is formed, namely that a plurality of A2O units are further formed in the overall aerobic environment insidethe BAF, and heterotrophic synchronous nitrification and denitrification can be realized.

The invention discloses a quick starting method of short-cut nitrification and denitrification of a wastewater treatment system. The method includes the following steps: (1) inoculating aerobic active sludge into a reactor and adding a growth accelerator A; (2) starting the system firstly in an intermittent water feeding manner and then in a continuous water feeding manner; (3) during intermittent operation, when concentration of suspensions in discharged water is lower than 100 mg / L, stopping addition of the growth accelerator A and adding denitrifying bacterial agent and a growth accelerator B; (4) when the ammonia nitrogen in inlet water reaches 400-700 mg / L and removal rate reaches more than 60% within 12 h, changing the operation into continuous water feeding, and adding the denitrifying bacterial agent and the growth accelerator B; and (5) when removal rate of total nitrogen reaches more than 70%, increasing the concentration of ammonia nitrogen until the ammonia nitrogen in inlet water reaches 500-1000 mg / L and the removal rate of total nitrogen reaches more than 80%, and at this time, completing the starting process. The method greatly reduces starting difficulty of short-cut nitrification and significantly reduces operation time, and ensures long-time stable operation of the reactor. The method has high treatment efficiency on wastewater, and can achieve simultaneous removal of ammonia nitrogen, total nitrogen and COD.

The invention discloses a microorganism electrochemical denitrification method for enhancing the bio-hydrogen production, which belongs to the field of environmental engineering and energy and chemical industry. The method is characterized in that a microorganism electrochemical system is used as a reactor, and denitrification microorganisms are added into a cathode to realize the nitrogen removal by denitrification of a biological cathode. Meanwhile, by adding the hydrogen-production microorganisms in the biological cathode, the BES (knowledge based expert system) denitrification capacity is further improved by utilizing the biological hydrogen production. The denitrification microorganisms can directly utilize the hydrogen generated by the hydrogen-production microorganisms in the biological cathode to carry out the denitrification effect; meanwhile, organic acid generated in the biological hydrogen production process can play a role in buffering pH, so that the BES denitrification rate can be further increased.

The invention relates to a method for removing SO2, NOx, heavy metal and particle of waste gas, wherein it comprises: using the common-temperature absorb liquid of nitrifying bacteria and sulfur oxidizing bacteria, in the biological absorb tower A, to be reacted with the waste gas, to transfer SO2, NOx, heavy metal and particle to liquid phase; then feeding the liquid and electric carrier to the anaerobic reactor B; under the condition that the pH value is 6.0-9.5, the temperature is 45-65Deg. C and the CODGr / S is 2-10, reducing sulfur into passive-two sulfur, reducing nitrogen into nitrogen gas, and transforming the heavy metal into sulfide deposition; then feeding the reacted water to the aerobic reactor C; under the condition that the pH value is 6.0-9.5, the temperature is 20-40Deg. C and the dissolved oxygen is 1.5-5mg / L, oxygenizing the sulfur selectively into single sulfur; the liquid separated from single sulfur is refluxed as the absorb liquid; for confirming there is enough nitrifying bacteria in the absorb liquid, keeping adding nitrifying bacteria.

The invention relates to a non-aeration baffled synchronous nitrifying and denitrifying type wastewater treatment system and a treatment method. The wastewater treatment system comprises a vertical box body, wherein a liquid inlet hole and a liquid outlet hole are respectively formed in the upper end and lower end of the vertical box body; a filler bracket is arranged in the vertical box body, anda baffled water flow passage is formed in the vertical box body from top to bottom; a porous filler is paved at the surface of the filler bracket, a micro-biological membrane is attached to the surface of the porous filler, and the micro-biological membrane consists of an outer nitrifying bacterial micro-biological membrane and an inner denitrifying bacterial micro-biological membrane. The wastewater treatment system has the advantage that the nitrifying reaction and the denitrifying reaction are integrated into one treatment system, and the wastewater permeates into the porous filler under the mutual action of gravity and capillary structure of the porous filler, is in contact with the outer nitrifying bacterial micro-biological membrane to convert the ammonia-nitrogen in the wastewaterinto nitrate and nitrite under the aerobic environment, and then is in contact with the inner denitrifying bacterial micro-biological membrane to convert the nitrate and nitrite in the wastewater intonitrogen gas under the anaerobic environment, and the nitrogen gas escapes from water, so as to reach the nitrogen removal effect of the wastewater.

The invention relates to the technical field of microbial denitrogenation, in particular to a denitrification microbe enrichment method. The enrichment method comprises the steps that an inoculation source is ground under an anaerobic condition, screened and washed with an anaerobic culture medium, and inocula are obtained; the inocula are subjected to enrichment culture, wherein the concentrationof the inocula is 1-3 g VSS / L, and the initial concentrations of NO3<->-N, NO2<->-N and NH4<+>-N are 30-80 mg / L, 5-10 mg / L and 30-80 mg / L respectively. According to the method, methane is used as anelectron donor, no carbon source needs to be additionally added, aeration for oxygen supplementation is not needed, the cost is saved, the excess sludge output is reduced, and the greenhouse effect isretarded. The nitrification-denitrification denitrogenation process is simplified, and multiple nitrogen sources are removed. The microbe enrichment time is obviously shortened, the enrichment time is only one twelfth to one quarter of the original time, the denitrogenation speed is obviously increased, and the speed is increased by 5-10 times.

The invention discloses Pseudomonas balearica, which is named Pseudomonas balearica EBT-1. The Pseudomonas balearica was preserved in China Center for Type Culture Collection on September 17, 2019, with a preservation number being CCTCC M 2019730. The invention also discloses application of the Pseudomonas baleari in the treatment of a landfill leachate membrane concentrate. According to the invention, high-salt-tolerant Pseudomonas balaerica EBT-1 is obtained by stepwise domestication of the landfill leachate membrane concentrate. The Pseudomonas balaerica EBT-1 can effectively remove the total nitrogen content of the landfill leachate membrane concentrate.

The invention relates to a method for improving the denitrification performance of an anaerobic ammonia oxidation system by adding biochar. The method comprises the following steps: 1, preparing sawdust biochar; 2, adding the wood chip biochar obtained in step 1 into an anaerobic ammonia oxidation biological denitrification system; and 3, after the matrix is consumed, recycling the biochar in the system. According to the invention, the electron transfer process of microorganisms is improved by using the oxidation-reduction characteristic of biochar, so that the conversion of nitrate nitrogen is promoted, the problem of nitrate nitrogen accumulation in the anaerobic ammonia oxidation system is successfully solved, the denitrification performance of the system is improved, and the efficient and stable operation of the system is realized. The biochar is prepared from waste biomass, and resource utilization of biomass waste can be achieved while efficient denitrification is achieved.

The invention discloses a sulfur-based autotrophic microorganism nitrogen removal material as well as a preparation method and an application method thereof. The autotrophic nitrogen removal material is a particulate matter obtained by mixing a sulfur-containing raw material with lime powder and then carrying out melting, forming and surface carbonation. The autotrophic nitrogen removal material disclosed by the invention is used as a filler of an anaerobic biological filter to construct a deep anaerobic biological filter bed, the nitrogen content of 25mg / L nitrate and nitrite can be reduced to be less than 5mg / L under the conditions that the hydraulic retention time is 40-60min at a proper temperature, the material disclosed by the invention is used for replacing an organic matter carbon source such as sodium acetate for nitrogen removal by denitrification, and the nitrogen removal cost is saved by more than 50%.

The invention relates to the technical field of environmental engineering. The purpose is to provide a device and method for zero-discharge treatment of late landfill leachate, which can improve the overall reaction efficiency of short-range nitrification-ANAMMOX, realize zero-discharge treatment of landfill leachate, and can remove landfill leachate Phosphorus, organic matter and heavy metal ions in the The technical solution is: a device for treating late-stage landfill leachate with zero discharge, which is characterized in that it includes a regulating tank unit, a short-range nitrification-anammox integrated reactor unit, a carbonization tank unit, a denitrification tank unit, a spirulina-nitrification Pool unit, sedimentation tank, membrane filtration system unit and intelligent control system; the short-range nitrification-anammox integrated reactor unit includes a short-range nitrification tank unit and anammox reactor unit; the spirulina-nitration tank unit It includes a spirulina pool unit and a nitrification pool unit; the membrane filtration system unit includes a microfilter, a nanofilter and an ultrafilter.

The invention relates to a composite biological denitrification wastewater treatment device, and belongs to the technical field of wastewater treatment. The wastewater treatment device comprises a vertically arranged reactor body, wherein a three-phase separator is arranged in the reactor body and divides the reactor body into an upper layer and a lower layer, the upper layer is a biological membrane area, the lower layer is a granular sludge area, the lower end of the reactor body is a water inlet end, and the upper end of the reactor body is a water outlet end; a water inlet component, wherein the output end of the water inlet component is connected and communicated with the water inlet end of the reactor body; a heating part, wherein the output end of the heating part is connected with the reactor body, and the heating part is used for heating the reactor body; and an aeration part, wherein the output end of the aeration part is communicated with the biological membrane area. The wastewater treatment device adopts biological nitrogen removal, has efficient nitrogen removal capacity, has high efficiency and strong impact load resistance, and synchronously improves the treatment effect and stability.

The invention discloses denitrifying bacteria and an aquatic plant-microbe combined repair method using the same. The denitrifying bacteria LR were collected in China Center for Type Culture Collection on May 3rd, 2011, and the collection number of the strains is CCTCC NO: M2011159. The plant-microbe combined repair method for a nitrogen eutrophic water body comprises the following steps of: planting cyperus alternifolius in the nitrogen eutrophic water body, and inoculating the denitrifying bacteria LR. The denitrifying bacteria LR and the cyperus alternifolius or cyperus alternifolius root exudates are combined for repairing the nitrogen eutrophic water body, and the strains LR has a promotion effect of repairing the nitrogen polluted water body through the cyperus alternifolius. The method for repairing the nitrogen eutrophic water body by combining the denitrifying bacteria LR and the cyperus alternifolius or the cyperus alternifolius root exudates is particularly suitable for treating the nitrogen eutrophic water body in nature.

The invention discloses a double-filler denitrification biological method for reducing nitrous oxide discharge and an application device. The application device comprises a reactor, a water inlet tank connected to one side of the reactor, a sludge tank connected to the other side of the reactor, an automatic feeder connected to the top of the reactor and a water decanter arranged on one side of the top of sewage in the reactor. Sewage in the reactor is filled with double fillers. The method is suitable for lower C / N, and has the advantages that the consumption of a carbon source in a traditional denitrification nitrogen removal process is reduced; the nitrogen removal rate of denitrification is improved, the nitrogen removal load of the reactor is high, the reaction time is shortened, and the effective utilization rate of the volume of the reactor is improved; the generation amount and the escape amount of greenhouse gas N2O in a traditional denitrification nitrogen removal process are effectively reduced, and the purpose of reducing carbon emission is achieved.

According to the method, hydroxide denitrifying bacteria and anaerobic ammonium oxidation bacteria are adopted for combined denitrification, ammonium radicals and nitrate radicals in wastewater are converted into nitrogen, nitrate nitrogen and ammonia nitrogen in the wastewater are deeply removed at the same time, an organic carbon source does not need to be additionally added, and complete autotrophy is achieved; the system can be operated for a long time, the total nitrogen in the effluent of the bioreactor is less than or equal to 1mgN / L, and the water quality can reach the surface water class III standard.

The invention provides an autotrophic denitrification deep denitrification device, which belongs to the technical field of waste water deep denitrification. The device includes a regulating tank, a reactor, and a sedimentation tank. A mud discharge area is provided at the bottom of the reactor, and a water distribution pipe is provided above the mud discharge area. There is a filter screen between the mud discharge area and the water distribution pipe. The water distribution pipe There is a reaction zone above the reaction zone, and a gas collection zone above the reaction zone. The device constructs an autotrophic denitrification biological filter bed, and optimizes the type and ratio of fillers in the reaction zone. The invention also discloses an autotrophic denitrification deep denitrification method. The method optimizes the operation mode and operating conditions, improves the biological activity and denitrification ability of the autotrophic denitrification bacteria in the system, thereby reducing the start-up time and enhancing the denitrification capacity. The denitrification effect of the system is improved, and it has the characteristics of low energy consumption, fast response, and no secondary pollution. It solves the problems of long start-up time, high sulfate concentration in effluent, Easy to block, easy to flow out of sulfur and other problems.

The invention relates to a treatment method for ammonia-containing wastewater, which comprises using activated sludge as a carrier, adding a growth promoter M under the condition that MLSS is 1000-2000 mg / L, and controlling DO to be 2.0-4.0 mg / L; When the removal rate of ammonia nitrogen reaches 50% to 70%, add denitrification microbial inoculants and growth promoter N to reduce DO to 1.0 to 2.0 mg / L; when the removal rate of ammonia nitrogen reaches more than 80%, reduce DO to 0.1 to 1.0 mg / L ; the growth promoter M comprises at least one of trehalolipid, sophorolipid and rhamnolipid; the growth promoter N comprises glycolipid, sugar alcohol and organic acid salt. By adding specific denitrifying bacteria agents and different growth promoters into the wastewater treatment system, and combining with the control of dissolved oxygen concentration, the present invention can not only realize the efficient removal of ammonia nitrogen and total nitrogen in the same reactor, but also can remove the nitrogen in the wastewater. Refractory organic pollutants, improve effluent quality.

The invention relates to the technical field of wastewater treatment, and discloses a pharmaceutical wastewater treatment process which comprises steps: preforming wastewater pre-treatment and comprehensive treatment, pumping wastewater into a coagulation gas floatation clarifier, adding polyaluminum chloride and polyacrylamide in a water input pipeline through a coagulation medicine adding system, then enabling mixed wastewater to enter a three-phase catalytic oxidation tower, a coagulative precipitation tank, a pre-acidification pool, a thermoregulation pool, a UASB reaction pool and a combined type hydrolysis acidification pool sequentially, subjecting the mixed wastewater to hydrolysis acidification, enabling the wastewater to enter a primary A / O pool, a primary precipitation pool, a secondary A / O pool, a secondary precipitation pool, a Fenton oxidation pool and a tertiary precipitation pool sequentially, and discharging standard outlet water from a standard discharging opening. The process has the advantages of stable running effect, high ammonium-nitrogen removal rate, and low running cost, thereby being suitable for treatment of wastewater, which is refractory to degrade, in the pharmaceutical industry.

The invention discloses an aerobic synchronous nitrification and denitrification biofilm method for treating nitrogen-polluted water bodies: the synchronous nitrification and denitrification biofilm is obtained by preparing a biofilm carrier; wherein the biofilm carrier is 70-80% degradable fiber carrier and 20~30% modified mussel shells. The beneficial effects are: based on the property of slow-release carbon source of the solid-phase carrier, the control ability of the carbon source is good, the physical and chemical adsorption capacity is good, the speed of film formation is fast, and the specific surface area of ​​the formed biofilm is large. The formed gel-like biofilm gradually forms a dissolved oxygen gradient from the surface to the interior, the surface is in an aerobic state, the middle is facultative, and the interior is anaerobic, forming a relatively independent aerobic-facultative-anaerobic state. Oxygen unit, that is, countless A2O units are formed in the overall aerobic environment inside the BAF to realize heterotrophic simultaneous nitrification and denitrification.

The invention discloses a denitrifying bacterium Pseudomonas songnenensis L103 with complete denitrification ability and rapid denitrification ability and its application. The strain has been preserved in the China Center for Type Culture Collection on March 20, 2019, and the preservation number is CCTCC M 2019184. The strain has genes encoding nitrate reductase, nitrite reductase, nitric oxide reductase and nitrous oxide reductase. These genes can encode a complete denitrification enzyme system that catalyzes NO 3 ‑ Complete reduction yields N 2 , and the denitrification rate can be as high as 1.62~2.36g NO 3 ‑ / day / L. Therefore, the strain has important application value in the preparation of denitrifying microbial bacterial agent for reducing nitrate leaching in soil below the root layer and nitrate pollution in groundwater, as well as purification and treatment of nitrogenous sewage.

The invention discloses a quick starting method of short-cut nitrification and denitrification of a wastewater treatment system. The method includes the following steps: (1) inoculating aerobic active sludge into a reactor and adding a growth accelerator A; (2) starting the system firstly in an intermittent water feeding manner and then in a continuous water feeding manner; (3) during intermittent operation, when concentration of suspensions in discharged water is lower than 100 mg / L, stopping addition of the growth accelerator A and adding denitrifying bacterial agent and a growth accelerator B; (4) when the ammonia nitrogen in inlet water reaches 400-700 mg / L and removal rate reaches more than 60% within 12 h, changing the operation into continuous water feeding, and adding the denitrifying bacterial agent and the growth accelerator B; and (5) when removal rate of total nitrogen reaches more than 70%, increasing the concentration of ammonia nitrogen until the ammonia nitrogen in inlet water reaches 500-1000 mg / L and the removal rate of total nitrogen reaches more than 80%, and at this time, completing the starting process. The method greatly reduces starting difficulty of short-cut nitrification and significantly reduces operation time, and ensures long-time stable operation of the reactor. The method has high treatment efficiency on wastewater, and can achieve simultaneous removal of ammonia nitrogen, total nitrogen and COD.

The invention provides a device and method for treating urban sewage by using a two-stage SPNA denitrification process, aims at the problems of poor denitrification effect, low denitrification load and the like existing in a prior urban sewage SPNA process, and belongs to the field of sewage biological treatment. The method is characterized in that two SPNA reactors are arranged in series. The sewage enters a first-stage SPNA reactor to carry out short-cut nitrification-Anammox reaction to remove 60-80% of ammonia nitrogen in the sewage, subsequently, the effluent from the first-stage SPNA reactor enters a second-stage SPNA reactor via an intermediate water tank. The second-stage SPNA reactor operates under intermittent aeration conditions to further remove residual ammonia nitrogen and complete the denitrification reaction. The two SPNA reactors operate under the conditions of high nitrogen load and intermittent aeration respectively, which is beneficial to inhibiting NOB and enriching Anammox bacteria, the denitrification rate is high, the operation parameters of the two SPNA reactors can be flexibly adjusted according to the quality of inlet water, the quality of outlet water isensured, the method has the advantages of high nitrogen removal rate and good denitrification effect, strong impact load resistance, simple operation and energy saving.