315 results about "Anammox" patented technology

The invention relates to the technical field of biological sewage treatment, in particular to a device and a method for improving the autotrophic nitrogen removal performance of an MABR (Membrane Ammonia Baffled Reactor). Coupling of partial nitrosation reaction and anaerobic ammonia oxidation reaction is completed; through a circular reaction zone and a membrane reaction zone in the reaction tank, nitrate nitrogen generated by anaerobic ammonia oxidation and excessive nitrite nitrogen during instability regulation are circularly removed, and the purpose of improving the total nitrogen removal effect of the reactor is achieved; a proper amount of a sodium nitrite solution is added at proper time, the concentration of free nitrous acid in a mixed solution of the reactor is increased, and the intermittent proportion of MABR intermittent aeration is synchronously regulated and controlled, so that the activity of nitrite oxidizing bacteria is synergistically inhibited by low dissolved oxygen and high free nitrous acid, and the unstable short-cut nitrification reaction is recovered again; the autotrophic nitrogen removal performance of the reactor is improved.

Method and device for treating coking wastewater through denitrification and anammox are provided. The device includes an anaerobic reactor, an anoxic reactor, a sedimentation tank, and an aerobic reactor sequentially communicated, and a coking wastewater tank communicated with the anaerobic reactor through an influent pump. The present disclosure promotes the formation of microgranular sludge in the device through a composite powder carrier, and promotes sulfur-based autotrophic denitrification in anaerobic and anoxic zones through pyrite in the composite powder carrier and an additional sulfur source, and promotes anammox in the anaerobic zone through NO2−—N produced by sulfur-based autotrophic denitrification in the anoxic zone. The present disclosure forms a dual-sludge system through the sedimentation tank to reduce reducing inorganic sulfur-containing substances that compete with nitrifying bacteria, and achieves nitrification in the aerobic zone while oxidizing ionic reducing inorganic sulfur-containing substances. The present disclosure discharges treated wastewater through a membrane component.

The invention belongs to the technical field of wastewater denitrification treatment, and particularly relates to an anaerobic ammonia oxidation reaction-based integrated partitioned denitrification method which comprises the following steps: S1, removing high-concentration organic matters and suspended matters in wastewater through coagulating sedimentation or chemical oxidation pretreatment to avoid inhibition on subsequent Anammox; s2, partitioning the integrated reactor, and setting a short-cut nitrification region and an Anammox reaction region; s3, enabling the effluent part of the Anammox reaction zone to flow back to the short-cut nitrification zone, supplementing nitrite and balancing the carbon nitrogen ratio; the Anammox granular sludge flows back to the reaction zone through the settling zone, and the biomass concentration and the reaction efficiency are maintained; s4, a secondary sedimentation tank or a built-in sedimentation zone is arranged to achieve mud-water separation, residual sludge is discharged, and it is guaranteed that effluent reaches the standard, and it is guaranteed that the denitrification efficiency is stable by dynamically adjusting dissolved oxygen of the short-cut nitrification zone and the pH value of the Anammox reaction zone.

A biological treatment of sewage device and method for realizing advanced nitrogen removal of domestic sewage by half partical nitrification-anammox coupled with sulfur autotrophic denitrification. The device includes a raw water tank, a half partical nitrification reactor, a regulating water tank and an anammox coupled denitrification reactor. The domestic sewage enters the half partical nitrification reactor, a mass concentration ratio of NO2−—N to NH4+—N in effluent water is 1-1.32 through real-time control, and then the effluent water enters the intermediate water tank. After it enters the upflow anammox coupled with autotrophic denitrification granular sludge reactor, the synergistic reaction of anammox and sulfur autotrophic denitrification in the reactor achieves the nitrogen removal. The device and the method improve denitrification efficiency by making full use of the synergistic effect between microorganisms, thereby realizing high-efficiency and energy-saving advanced nitrogen removal of municipal sewage.

The invention relates to the field of town sewage treatment, in particular to a town sewage carbon-nitrogen-phosphorus synergistic advanced treatment method based on biological manganese oxide. The method comprises the following steps: S1, configuring an upward flow denitrification filter tank; s2, a starting stage: taking a mixed solution of secondary effluent and secondary influent water of an actual town sewage treatment plant and manganese sulfate as influent water of a denitrification filter tank with the manganese concentration of 3.0 mg / L, inoculating hydrolytic acidification bacteria, denitrifying bacteria, anaerobic ammonium oxidation bacteria and manganese oxidation bacteria into the denitrification filter tank, and gradually increasing the ratio of the secondary influent water to the secondary effluent water in the mixed solution to 3%; s3, a stable stage: taking a mixed solution of secondary effluent and secondary inlet water of an actual town sewage treatment plant and manganese sulfate as inlet water of the denitrification filter tank, controlling the manganese concentration to be 3.0 mg / L, controlling the hydraulic retention time to be 3-4 hours, and controlling the backwashing period to be 9-11 days. The method can synchronously and efficiently remove carbon, nitrogen and phosphorus in the secondary effluent of the actual town sewage treatment plant at low cost.

A device and method for enhancing nitrogen and phosphorus removal based on a multistage AO partial denitrification coupled with Anammox process in combination with a sludge hydrolytic acidification mixture belong to the technical field of active sludge method wastewater treatment. A system includes a water tank, a water pump, a biochemical reaction zone, a hydrolytic acidification tank and other devices. A multistage AO step-feed pipeline is used to inject raw water into the reaction zone in a segmented manner, guaranteeing efficient utilization of organic matter in the raw water; biofilm carriers are added into an anaerobic zone and anoxic zones to enrich anammox bacteria, and nitrite nitrogen produced by partial denitrification provides a substrate for the anammox bacteria to realize autotrophic nitrogen removal; a nitrification and phosphorus accumulating bacteria aerobic phosphorus uptake are performed in aerobic zones; and part of excess sludge in a secondary sedimentation tank enters the hydrolytic acidification tank to convert macromolecular organic matter into low molecular weight organic matter, a hydrolytic acidification mixture and the excess sludge in the secondary sedimentation tank synchronously flow back to the anaerobic zone, and as a high-quality carbon source, the low molecular weight organic matter can promote partial denitrification. The system provides a novel method for efficient and energy-saving treatment of municipal wastewater.

The invention belongs to the technical field of sewage treatment, and particularly relates to an anaerobic ammonia oxidation-photoelectric denitrification deep nitrogen removal method. The method comprises the following steps: firstly, adopting a double-chamber reactor; introducing part of sewage into the cathode chamber, carrying out Anammox reaction under a dark state condition to remove ammonia nitrogen and part of nitrite nitrogen, and synchronously generating nitrate nitrogen; turning on a light source to irradiate the anode chamber, exciting photo-induced electrons by a photosensitizer, transmitting the photo-induced electrons to the cathode chamber through an external circuit, and driving the sulfur autotrophic denitrification sludge to reduce residual nitrite nitrogen and nitrate nitrogen generated by Anammox; the total nitrogen removal rate is close to 100%. According to the invention, photo-induced electrons are used as the only denitrification electron donor, so that the addition of a carbon source / sulfide is thoroughly avoided, and the risk of secondary pollution is eliminated. The method is suitable for green low-carbon deep treatment of sludge digestion liquid and pharmaceutical wastewater high-ammonia-nitrogen low-carbon-nitrogen-ratio sewage.

The invention relates to the field of wastewater treatment, and discloses a method for treating nitrogen-containing wastewater based on sulfur autotrophic DNRA and anaerobic ammonia oxidation, which comprises the following steps: firstly, introducing nitrogen-containing wastewater into an Anammox reactor, inoculating granular sludge taken from a secondary sedimentation tank of a sewage treatment plant into the Anammox reactor, carrying out anaerobic ammonia oxidation reaction, controlling hydraulic retention time, and carrying out anaerobic ammonia oxidation treatment on the sludge; the method comprises the following steps: pumping effluent and sulfur source inlet water into an sDNRA reactor together, inoculating ordered batch sDNRA sludge into the sDNRA reactor, performing DNRA action under sulfide driving in a stirring state, and controlling hydraulic retention time to realize automatic effluent. According to the method disclosed by the invention, a carbon source does not need to be added, byproducts generated along with complex carbon metabolism can be effectively reduced, the cost can be effectively reduced while secondary pollution is avoided, the total nitrogen removal rate of the system can be successfully improved, and the generation of greenhouse gas N2O is reduced.

A mainstream anaerobic ammonia oxidation enhanced denitrification device and method based on a fluidized bed biofilm. By arranging reaction tanks, switching of two operation modes can be achieved, and recovery of instability in starting and running periods is completed. A denitrification pathway comprises: implementing denitrification and partial denitrification-anaerobic ammonia oxidation synergy in an anoxic zone; and implementing nitrification, synchronous nitrification and denitrification, and partial nitrification-anaerobic ammonia oxidation synergy in an aerobic zone. Implementation of anaerobic ammonia oxidation for denitrification in the anoxic zone or the aerobic zone requires first enhancement of an aerobic biofilm, enhancement of the thickness of the biofilm under the action of high DO, and formation of an internal anoxic / anaerobic layer, thereby providing conditions for enrichment of anaerobic ammonia oxidizing bacteria.

The invention belongs to the field of industrial wastewater treatment, and relates to an iron autotrophic denitrification coupling anaerobic ammonia oxidation combined enrichment culture device and method. Comprising a water inlet tank, a No.1 anoxic reactor, an intermediate tank and a No.2 anaerobic reactor, the water inlet tank is provided with a water outlet pipeline of the water inlet tank, and the water outlet pipeline of the water inlet tank is connected with the No.1 anoxic reactor; the anoxic reactor I is provided with a water outlet pipeline of the anoxic reactor I, and the water outlet pipeline of the anoxic reactor I is connected with the intermediate tank; the intermediate tank is provided with an intermediate tank water outlet pipeline, and the intermediate tank water outlet pipeline is connected with the No.2 anaerobic reactor; the No.2 anaerobic reactor is provided with a No.2 anaerobic reactor water outlet pipeline; the No.2 anaerobic reactor water outlet pipeline is connected with the No.1 anoxic reactor. According to the invention, collaborative culture of autotrophic denitrification bacteria and anaerobic ammonium oxidation bacteria can be realized, an autotrophic denitrification effect provides a certain amount of nitrite and iron ions to promote anaerobic ammonium oxidation reaction, and an anaerobic ammonium oxidation effect can effectively prevent an autotrophic denitrification tank body from being mineralized.

The invention discloses an iron-loaded biomass charcoal reinforced PN-Anammox integrated nitrogen removal method and a preparation method thereof. The preparation method comprises the following steps: firstly, selecting a proper biomass material, drying the biomass material, soaking the biomass material in an iron salt solution, and performing post-treatment to obtain biomass charcoal particles Fe / BC loaded with micro-nano iron; then inoculating the Fe / BC and anaerobic ammonia oxidation sludge into an anaerobic reactor for culturing, and regulating and controlling process parameters to form Fe / BC-Anammox composite anaerobic sludge particles; and then inoculating into a reactor containing domesticated and matured short-cut nitrification sludge, regulating and controlling reaction conditions to construct an integrated denitrification system, monitoring the effect, and enabling the denitrification system to stably operate within a certain dissolved oxygen fluctuation range. The method has a wide prospect in the field of ammonia nitrogen wastewater treatment, and a new method is provided for solving the problem of poor stability of related PN-Anammox integrated denitrification.

The present invention proposes a MABR membrane assembly, a MABR reactor, a MABR reactor operation method and a MABR biofilm optimization control method, which adopts a cross-flow working mode between horizontal membrane filaments and water flow to improve the mass transfer efficiency of the matrix and metabolites in the MABR biofilm; the composite structure membrane assembly is used to promote the complementarity and symbiosis of various microorganisms such as carbon removal aerobic bacteria, nitrifying bacteria, denitrifying bacteria and anaerobic ammonia oxidizing bacteria; different areas such as MABR membrane reaction area, pre-reaction area and water distribution and gas distribution area are constructed in the same reactor to complete short-range nitrification or partial short-range nitrification reaction, short-range denitrification reaction and anaerobic ammonia oxidation reaction respectively, so as to achieve efficient biological denitrification of sewage with low carbon-nitrogen ratio in a single-stage MABR reactor. At the same time, the optimization control method of the MABR biofilm solves the problems that the overly thick biofilm in the MABR reactor is not easy to be effectively washed, and the fixed gas washing frequency and intensity are difficult to simultaneously adapt to the biofilm washing and film removal requirements of membrane filaments in different parts.

The application discloses a method for efficient denitrification and decarburization of kitchen waste and sludge co-fermentation anaerobic digestion effluent, which removes part of COD and ammonia nitrogen in the influent sludge by using a first SNAD, and maintains a certain amount of free ammonia of a certain concentration due to the high concentration of ammonia nitrogen and the high pH of the influent, so as to maintain the inhibition effect on nitrifying bacteria and ensure the conversion of part of the ammonia nitrogen into nitrite nitrogen, and the high activity of anaerobic ammonia oxidation bacteria is ensured in the first SNAD by limiting the aeration amount, so that the ammonia nitrogen and nitrite can be further removed; the effluent enters a nitrification tank, and the ammonia nitrogen is nitrified into nitrate nitrogen under the condition of nitrifying bacteria and sufficient aeration amount, and then enters a denitrification tank, and the denitrification process is carried out under the condition of heterotrophic denitrifying bacteria and sufficient carbon source, so that most of the nitrate nitrogen in the system is converted into nitrogen gas and removed, finally, the clear liquid is discharged after being filtered by an MBR membrane in a membrane tank, so as to achieve the purpose of efficient denitrification and decarburization of kitchen waste anaerobic digestion effluent.

A method for in-situ efficient enrichment of anaerobic ammonia oxidation bacteria, comprising: using anaerobic digestion sludge as inoculation sludge and using nitrate wastewater as an influent substrate, the inoculation sludge and the influent substrate reacting with each other under a light-proof, constant-temperature and closed condition so as to enrich anaerobic ammonia oxidation bacteria. After the anaerobic ammonia oxidation bacteria are enriched about 30 days by using the anaerobic digestion sludge as the inoculation sludge and the nitrate wastewater as the influent substrate, the number of functional genes HzsB of the anaerobic ammonia oxidation bacteria is increased by about 100 times than that in a control group (using a liquid mixture of ammonia nitrogen and nitrite nitrogen as an influent substrate). Thus, on one hand, there is no need to add extra ammonia nitrogen and nitrite nitrogen, and on the other hand, there is no need to regulate and control complex process parameters. Therefore, in-situ rapid and sustainable enrichment of anaerobic ammonia oxidation bacteria can be implemented in wastewater treatment plants simply by means of an economical and simple operation mode.

The invention discloses a method and a device for culturing integrated short-cut nitrification anaerobic ammonia oxidation granular sludge. The method comprises the following steps: sequentially connecting a biological selection tank, an aeration tank and a precipitation selection tank in an overflow manner; aerobic granular sludge and integrated short-cut nitrification anaerobic ammonia oxidation sludge are inoculated in the biological selection tank and the aeration tank, wherein the proportion of the integrated short-cut nitrification anaerobic ammonia oxidation sludge is 5%-10%. According to the method, aerobic granular sludge and short-cut nitrification anaerobic ammonia oxidation granular sludge have similar microbial layered structures, and rapid formation of the integrated short-cut nitrification anaerobic ammonia oxidation granular sludge based on microbial ecological niche conversion is promoted through ecological niche replacement of anaerobic ammonia oxidation bacteria. Part of effluent of the precipitation selection tank flows back, and the ascending velocity of liquid in the precipitation selection tank is increased to promote floc sludge elutriation and granular sludge enrichment. The method is convenient to operate and simple to control, can be applied to a continuous flow process, and is beneficial to quick start and stable operation of an integrated short-range anaerobic ammonia oxidation system.

The invention relates to a two-stage PD-HAP coupled Anammox synchronous nitrogen and phosphorus removal method in the technical field of sewage biochemical treatment, and aims to solve the problems that phosphorus cannot be removed by a PD / A process, phosphorus resources are difficult to recover and the like, short-cut denitrification and a hydroxyapatite process (PD / HAP) are combined, Anammox is synchronously coupled, the purpose of synchronous nitrogen and phosphorus removal is achieved, and phosphorus recovery can also be taken into consideration. The real-time control device is simple to operate, the reactor can be flexibly regulated and controlled, the reaction condition can be timely optimized, the total nitrogen removal rate is stabilized at 85%, and the phosphorus removal rate reaches 83%.

The invention discloses a rapid propagation method for anaerobic ammonia oxidation granular sludge driven by a carbon nucleus. The method comprises the following steps: 1, selecting agricultural waste sawdust as a raw material to prepare biochar; the method comprises the following steps: directly adding biochar into an EGSB reactor to serve as a nucleation carrier of granular sludge; step 2, setting operation conditions of the EGSB reactor; 3, adding flocculent anaerobic ammonia oxidation sludge into the EGSB reactor, and promoting the sludge to be converted from flocculent to granular through the synergistic effect of biochar induction and hydraulic shear force; and step 4, carrying out sludge enrichment and system load regulation and control, and finally forming carbon nucleus Anammox particles. According to the invention, the rapid formation of the carbon nucleus Anammox granular sludge is realized, and the settling performance of the sludge and the denitrification efficiency of the system are greatly improved.

The invention relates to a mainstream anaerobic ammonia oxidation quick start and efficient stable operation method, which uses an immersed anaerobic ammonia oxidation granular sludge membrane biological composite reactor comprising an upflow anaerobic sludge blanket (UASB), and an MBR is immersed in the upper part of the upflow anaerobic sludge blanket (UASB); the height-diameter ratio of the UASB is 4-6, and the overall length of the MBR is 1 / 2-1 / 3 of the height of the UASB. The granulation of the sludge is realized through the UASB, and the enrichment capacity, the sedimentation performance and the stability of the sludge are improved; in the operation process of the mainstream Anammox, the complete retention of sludge functional bacteria is realized by adopting the operation of gradually shortening the hydraulic retention time and improving the nitrogen load and through the biological complete interception effect of the immersed MBR. In the granulation process of the sludge, the settling performance of the sludge is improved, a large amount of flocculent sludge is prevented from being in direct contact with membrane filaments, the membrane pollution problem in the membrane assembly is relieved, meanwhile, water flow shearing force generated around the membrane assembly can effectively wash pollutants on the surface of the membrane assembly, and the membrane pollution problem is further controlled.

The present invention discloses a novel device for culturing and proliferating anaerobic ammonia-oxidizing bacteria, including a reactor, a water inlet mechanism, a negative pressure forming mechanism, a low-voltage power supply, an anode, a cathode, a constant temperature mechanism and a water outlet mechanism. The reactor is provided with a reaction tank body and a water bath from the inside to the outside, the water bath is wrapped around the outside of the reaction tank body, a containing chamber is provided in the reaction tank body, the water inlet mechanism is connected to the bottom of the containing chamber, the water outlet mechanism is connected to the upper part of the containing chamber, the negative pressure forming mechanism is installed above the reactor and is connected to the containing chamber, and is used to form a negative pressure environment in the containing chamber, the anode and the cathode are symmetrically installed in the containing chamber, and are respectively electrically connected to the positive and negative poles of the low-voltage power supply, and the constant temperature mechanism is connected to the water bath, and the water in the water bath is circulated and kept warm. The present invention adopts a novel device that combines a specific negative pressure with a low voltage and a specific reaction tank body, and cooperates with a culturing method to achieve rapid recovery of the activity of anaerobic ammonia-oxidizing sludge and promote the proliferation of anaerobic ammonia-oxidizing bacteria.

The invention discloses a preparation method and application of Anammox bacteria sulfide quinone oxidoreductase, and belongs to the technical field of bioengineering. The enzyme is derived from anaerobic ammonia oxidation Anammox bacteria, the nucleotide sequence of the enzyme is as shown in SEQ ID NO 1, and the amino acid sequence of the enzyme is as shown in SEQ ID NO 2. The preparation method comprises the following steps: 1) designing and synthesizing a primer for amplifying a sulfide quinone oxidoreductase gene; 2) carrying out PCR amplification and constructing a recombinant plasmid; and 3) expressing and purifying the sulfide quinone oxidoreductase. Anmmox bacteria containing the enzyme can be widely applied to the fields of sewage treatment, environmental restoration, biosensing and the like. The bacterium not only can efficiently convert ammonia nitrogen and nitrite in wastewater into nitrogen, but also can synergistically reduce the concentration of sulfide in the wastewater, reduce the pollution to the environment, improve the wastewater treatment efficiency and reduce the operation cost. The enzyme still has high denitrification activity under oxygen-containing and salt-containing conditions.

Disclosed in the present invention are an electrochemically enhanced anaerobic-ammonium-oxidation membrane bioreactor based on a conductive separation membrane, and a biological nitrogen-removal method using same. The membrane bioreactor comprises a reactor shell, an anode, a cathode, a direct-current power supply, a water intake line and a water output line, wherein anaerobic-ammonium-oxidation bacteria are loaded into the reactor shell, and a water inlet is provided at the bottom of the reactor shell and is connected to the water intake line; the anode and the cathode are located in the reactor shell; a positive electrode of the direct-current power supply is connected to the anode, and a negative electrode of the direct-current power supply is connected to the cathode; and the cathode is a conductive membrane assembly, and a water outlet is provided at the top of the conductive membrane assembly and is connected to the water output line. In the present invention, a membrane biological treatment is coupled with an electrochemical technique, such that anaerobic-ammonium-oxidation bacteria can be effectively retained and enriched, the nitrogen-removal effect of the anaerobic-ammonium-oxidation bacteria is enhanced, and membrane fouling is alleviated by means of electrostatic repulsion. The device has a good nitrogen-removal performance, effectively alleviates membrane fouling, is easily operated and has broad application prospects.

The invention relates to a method for strengthening a mainstream anaerobic ammonia oxidation process by using iron modified diatomite, which adopts an immersed anaerobic ammonia oxidation granular sludge membrane biological composite reactor and comprises the following steps: uniformly mixing an iron element and diatomite in water according to a mass ratio of the iron element to the diatomite of 1: 15-1: 40, drying, and calcining at 450-600 DEG C, iron modified diatomite is obtained; mixing the iron modified diatomite and the inoculated sludge, and adding the mixture into an immersed anaerobic ammonia oxidation granular sludge membrane biological composite reactor, wherein 2.5-3.5 g of the iron modified diatomite and 65-70 mL of the inoculated sludge are added into each 1 L of effective reactor volume; when the concentrations of inlet water ammonia nitrogen and nitrite nitrogen are both 30 + / -2mg / L, executing a mainstream anaerobic ammonia oxidation process; the hydraulic retention time is gradually shortened to improve the nitrogen load, nitrogen is removed, and the anaerobic ammonia oxidation granular sludge is cultured and domesticated. According to the method, iron modified diatomite is taken as a carrier, sludge granulation is enhanced, and rapid starting and efficient and stable operation of a mainstream Anammox process are realized.

The invention provides a domestic sewage treatment method and system based on shortcut nitrification and anaerobic ammonia oxidation of Anammox bacteria preposed alkali reduction, and relates to the technical field of sewage treatment. The method comprises the following steps: anaerobic treatment: converting an organic suspended solid into an easily degradable carbon source through hydrolytic acidification bacteria; the carbon source is absorbed by denitrifying phosphorus-accumulating bacteria and denitrifying glycogen-accumulating bacteria and is stored as an intracellular carbon source; primary anoxic treatment: reacting ammonia nitrogen with nitrite through Anammox bacteria, and synchronously reducing alkalinity; aerobic treatment: under the condition of low alkalinity, in combination with low dissolved oxygen control, Comamox bacteria oxidize ammonia nitrogen into nitrite and accumulate the nitrite; and secondary anoxic treatment: denitrifying residual oxidation nitrogen into nitrogen by using intracellular carbon through denitrifying glycogen-accumulating bacteria. Through the synergistic effect of the hydrolytic acidification bacteria, the denitrifying phosphorus-accumulating bacteria, the Anammox bacteria, the Commox bacteria and the denitrifying glycogen-accumulating bacteria, efficient nitrogen and phosphorus removal is realized.

The invention discloses a device and a method for realizing double-short-range coupling anaerobic ammonia oxidation sewage denitrification by combining biologically-enhanced carbon capture with a two-stage membrane aeration bio-membrane reactor. A high-load activated sludge device and an anaerobic fermentation tank are used for carbon source extraction, and a carbon source is provided for a subsequent anoxic tank. The two-stage MABR system adopts a hollow fiber membrane to perform bubble-free membrane aeration, and oxygen is diffused to form an oxygen concentration gradient, so that the surface of the membrane is divided into an oxygen-rich region and an oxygen-poor region. In the aerobic section, the dissolved oxygen gradient of a biological membrane is regulated and controlled to construct a nitrifying bacterium and anaerobic ammonium oxidation bacterium function partition, so that short-cut nitrification coupled anaerobic ammonium oxidation synergistic denitrification is realized; in the anoxic section, nitrate nitrogen and part of ammonia nitrogen are reduced and COD (Chemical Oxygen Demand) is removed through the synergistic effect of short-cut denitrification and anaerobic ammonia oxidation and synchronous nitrification and denitrification on the surface of the membrane. The two-stage MABR synergistic carbon capture device denitrification system constructed by the method realizes efficient and stable deep denitrification, reduces the addition of a carbon source and the yield of sludge, and saves energy consumption.

This invention discloses a composite sponge carrier for anaerobic ammonia oxidation, its preparation method, and its application, belonging to the field of wastewater treatment technology. The composite sponge carrier comprises: a porous polyurethane sponge and a composite component loaded on the surface and internal pores of the porous polyurethane sponge; wherein the composite component includes chitosan-modified biochar as a microbial affinity functional component and zeolite powder as a component for ammonia nitrogen adsorption and ion exchange regulation. This invention introduces more active functional groups and hydrophilic interfaces conducive to microbial attachment through chitosan modification, and then co-impregnates and loads it with zeolite powder onto the surface and pores of the polyurethane sponge. This improves the composite sponge carrier's retention and enrichment capacity for anaerobic ammonia oxidizing bacteria, improves the local substrate environment during the start-up phase, promotes rapid biofilm establishment, and enhances the system's operational stability.

This invention discloses a continuous-flow anaerobic bypass IFAS-AOA device and method for treating inert high-ammonia nitrogen wastewater, belonging to the field of biological treatment technology for high-ammonia nitrogen wastewater. The device consists of three parts: a raw water storage tank, a continuous-flow anaerobic bypass AOA reactor, and a sludge-water separation system. The effluent from the end of the anaerobic process enters the aerobic zone of the AOA reactor, while the anaerobic end-mixed liquor bypasses to the anoxic zone, mixes with the aerobic end-effluent, flows through the anoxic zone, and enters the sludge-water separation system. In the anaerobic zone, endogenous denitrifying bacteria store organic matter from the raw water as an intracellular carbon source and bypass to the anoxic zone. In the aerobic zone, short-cut nitrification coupled with anaerobic ammonia oxidation serves as the main nitrogen removal pathway. In the anoxic zone, anaerobic ammonia oxidation coupled with endogenous denitrification achieves deep nitrogen removal. The existence of anaerobic bypass allows some of the mixed liquor to bypass the aerobic zone and directly bypass to the anoxic zone, thus fully utilizing the carbon source in the raw water. This invention can achieve stable short-cut nitrification and effective retention of anaerobic ammonia oxidizing bacteria, showing broad application prospects.

The application discloses an iron-mediated EGSB type PD / anammox-FePs coupling system and a wastewater treatment method, and belongs to the technical field of wastewater treatment. The iron-mediated EGSB type PD / anammox-FePs coupling system comprises an EGSB reactor and a water inlet system. The water outlet end of the water inlet system is communicated with the bottom of the EGSB reactor. The water inlet system comprises an organic carbon source storage tank, an iron source storage tank, a nitrogen-containing wastewater storage tank, a pump body and pipelines. The organic carbon source storage tank, the iron source storage tank and the nitrogen-containing wastewater storage tank are respectively communicated with the bottom of the EGSB reactor through the pipelines. The pipelines are provided with a reflux pump and a circulating fan to optimize the flow state distribution. The iron mediation improves the nitrogen metabolism intensity and the electron transfer capacity of the system, optimizes the microbial community structure, promotes the formation of high-efficiency mass transfer particles, and then realizes the simultaneous and efficient removal of nitrogen and phosphorus under the condition of low HRT.

This specification describes a membrane aerated biofilm reactor (MABR) and processes for nitritation, nitritation-denitritation or deammonification. The supply of oxygen through the gas-transfer membrane is limited to suppress the growth of nitrite oxidizing bacteria (NOB). Exhaust gas from an MABR unit may have an oxygen concentration of 4% or less. The process can optionally include one or more of: intermittent (batch) feed of process air; process air modulation; process air direction reversal; process air recycle; and, process air cascade flow. The process can optionally include adding a seed sludge containing anammox to a reactor, optionally after pre-treatment and selection. The process can optionally include pre-seeding an MABR media.

The present application belongs to the field of sewage biological treatment technology, and particularly relates to a device and method for realizing simultaneous denitrification and phosphorus removal by short-cut nitrification / anaerobic ammonia oxidation based on sludge side chlorination treatment, comprising a water inlet tank, an AO reactor connected with the outlet of the water inlet tank, a secondary sedimentation tank connected with the outlet of the reactor, and a sludge chlorination pretreatment reactor connected with the outlet of the secondary sedimentation tank, wherein the AO reactor is divided into an anaerobic zone and an aerobic zone, the sludge chlorination pretreatment reactor is communicated with the aerobic zone through a first sludge return pump, and the secondary sedimentation tank is communicated with the anaerobic zone through a second sludge return pump, wherein the sludge is treated by side anoxic treatment, only part of the residual sludge is subjected to chlorination treatment, and the influence on anaerobic ammonia oxidation bacteria on the biofilm is avoided, so as to ensure the stable operation of the whole system.

The invention belongs to the technical field of biological denitrification, and particularly relates to a core-shell composite material, a preparation method and application thereof, and a treatment method of nitrogen-containing wastewater. The core-shell type composite material provided by the invention is applied to an Anammox process, so that the rapid enrichment of anaerobic ammonia oxidation sludge is realized, and the protection effect on the anaerobic ammonia oxidation sludge is realized by screening adverse factors such as heavy metals and antibiotics in wastewater; under the synergistic effect of the biochar, the transition metal and the molecular sieve, the combined effect of enriching and protecting the AnAOB is realized. The core-shell composite material provided by the invention can promote stable operation of an anaerobic ammonia oxidation process in an actual wastewater treatment process and large-scale engineering application of the process.