54 results about "Denitrifying bacteria" patented technology

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.

This utility model discloses an oxygen denitrification treatment device for aquaculture water, including a treatment tank. The treatment tank is equipped with a filtration zone, an aerobic biological zone, an anoxic biological zone, and a degassing zone. The filtration zone is filled with quartz sand filter media. The aerobic biological zone contains biological packing material and has a jet aeration ring on its outer wall, which is connected to an ozone-oxygen mixture generator. The anoxic biological zone is filled with porous ceramsite packing material. The degassing zone has a guide plate inside. In this utility model, the aquaculture water can be filtered for suspended particulate matter through the quartz sand filter media. The jet aeration ring can introduce ozone-oxygen mixture gas, which, together with the honeycomb biological packing material, can complete ammonia nitrogen oxidation. The denitrifying bacteria on the surface of the porous ceramsite packing material can convert nitrates into nitrogen gas. Finally, the gas is separated by the guide plate, and the purified water can be discharged from the outlet. Thus, through the above structure, efficient denitrification, oxygenation, and purification of aquaculture water can be achieved, improving water quality treatment efficiency and stability.

The application discloses a biological electrochemical auxiliary sulfur conversion promoting sulfur-based denitrification and sulfate emission reduction method and belongs to the field of water treatment. ‑ Nitrogen-containing wastewater enters an elemental sulfur denitrification system, and NO3 0 is reduced to N2 by sulfur autotrophic denitrifying bacteria, and elemental sulfur (S 2‑ ) is converted into SO4 2‑ . Effluent enters a cathode chamber of an electrochemical auxiliary sulfate reduction system, and hydrogen autotrophic sulfate reducing bacteria utilize cathode hydrogen production to reduce SO4 ‑ to HS 2‑ , and meanwhile, alkalinity produced by cathode hydrogen production neutralizes acidity produced in the denitrification process in the elemental sulfur denitrification system. ‑ HS 2‑ / supernatant is returned to the elemental sulfur denitrification system to react with S 0 to generate polysulfide (S n 2‑ ), S n 2‑ , which is used as an efficient electron donor to participate in denitrification, thereby significantly improving denitrification efficiency. The application does not need to add an organic carbon source, sludge production is small, high-concentration nitrogen-containing wastewater is efficiently treated, and the content of sulfate in effluent is simultaneously reduced, thereby realizing sulfur resource recycling, and the application is an economic and environment-friendly autotrophic denitrification method.

This application relates to the field of wastewater treatment, specifically disclosing a sulfur autotrophic denitrification process; including the following specific steps: S1: After adjusting the pH of calcium nitrate tetrahydrate solution and ammonium dihydrogen phosphate solution to alkaline, triethanolamine is added dropwise to the calcium nitrate solution, followed by the addition of ammonium dihydrogen phosphate solution to form a reaction solution. The pH of the reaction solution is maintained at alkaline, and the reaction is heated. After filtration, washing, and drying, hydroxyapatite powder is obtained. The hydroxyapatite powder is mixed with a foaming agent, foam stabilizer, and adhesive, pressed into shape, and sintered to obtain a porous ceramic carrier; S2: The porous ceramic carrier, ground inorganic energy material, and denitrifying bacteria are added to the wastewater to be treated, mixed, and subjected to aeration treatment. The inorganic energy material is replenished periodically to complete the process. The sulfur autotrophic denitrification process used in this application has high denitrification efficiency, and no replenishment of denitrifying bacteria is required during the process.

The application relates to a low-temperature aerobic denitrifying Pseudomonas sp. H2-1 and application thereof, and belongs to the technical field of microorganisms. Pseudomonas The strain expands the resource library of aerobic denitrifying bacteria in a polar low-temperature environment, and provides theoretical support for revealing the aerobic denitrifying mechanism under cold conditions and optimizing the sewage treatment process in cold regions.

The present application relates to water pollution treatment technical field, disclose the present application discloses a kind of V filter tank for sewage treatment, including multiple filter tank main body, water inlet groove, biological filter layer, quartz sand filter material layer, supporting layer, filter plate and water outlet groove are sequentially arranged from top to bottom in each filter tank main body;Biological filter layer includes installation frame and multiple layers of sliding frames arranged in installation frame along horizontal direction, each layer of sliding frame is separated into multiple through slots by partition, biological filler is fixed in through slot, heating wire is arranged in the inside of partition, iron block is arranged on sliding frame, electromagnet and spring are correspondingly arranged on installation frame;When the temperature of water inlet is lower than the set threshold, heating wire is powered to heat, electromagnet is powered to make multiple layers of sliding frames staggered, and the water flow channel is changed from vertical straight path to zigzag path.The present application can quickly improve water temperature and prolong contact time under low temperature condition, guarantee the metabolic activity of denitrifying bacteria, and realize stable denitrification effect.

The utility model discloses a kind of gradient porosity MABR membrane silk assembly structures, including tube sheet, the bottom of the tube sheet is fixedly installed with hydrophobic layer, the inner wall of the hydrophobic layer is fixedly attached with vertical support layer, the hydrophobic layer and vertical support layer are all perforated with air hole, the inside of the vertical support layer is perforated with through hole, the diameter of the straight hole of the one end of tube sheet close to through hole is larger by being set, the one end of tube sheet is gas inlet end, so the gas pressure of the one end of tube sheet close is smaller, the diameter of the through hole of far away gas inlet end is smaller, so the passage cross-sectional area of the one end of tube sheet close is reduced, gas compression leads to gas pressure greater than gas inlet end, so the oxygen content dissolved into external water in unit time will rise, compensate terminal biofilm due to biofilm thickening leads to dissolved oxygen content low Problem, the air hole density of gas outlet end is larger, enhance the oxygen diffusion capacity of terminal, compensate oxygen transfer attenuation due to biofilm thickening, avoid terminal anoxia, promote outer layer denitrifying bacteria enrichment.

This utility model discloses a denitrification packing carrier for biological filters, belonging to the field of denitrification packing technology. It includes a packing matrix with multiple insertion and mounting cavities on its sidewalls and a mesh structure, microbial balls placed inside the packing matrix, and packing blocks located at each of the insertion and mounting cavities. Several packing blocks are attached to the sidewalls of the packing matrix, allowing it to contact wastewater from various directions. The activated carbon adsorption packing within the mesh packing blocks adsorbs the wastewater in the biological filter, while nitrifying bacteria, denitrifying bacteria, and polyphosphate-accumulating bacteria loaded on the microbial balls perform combined denitrification treatment. During the treatment process, the exothermic balls in each release cavity heat up upon contact with water, raising the temperature of the biological filter and thus promoting the denitrification reaction efficiency. This denitrification packing carrier for biological filters can efficiently and stably treat nitrogen pollutants in wastewater, achieving water purification goals.

The application provides a kind of biological-Fenton-ozone synergistic wastewater treatment system, belongs to industrial wastewater treatment field.The system includes the communication of adjusting pool, biochemical pool, first sedimentation tank, Fenton catalytic oxidation device, second sedimentation tank, ozone catalytic oxidation device and clean water pool in turn.The five-stage partition structure of anaerobic section to post aerobic section is used in biochemical pool, and each section is filled with specific microbial filler: anaerobic section enriches phosphorus-accumulating bacteria to degrade organic matter, front / back anoxic section prevents filler from hardening by stirrer and inoculates denitrifying bacteria to remove nitrogen, front / back aerobic section is oxygenated by aeration device and enriches nitrifying bacteria to achieve efficient nitrification.The sludge of first sedimentation tank is returned to anaerobic section of biochemical pool to reduce sludge production;after Fenton unit decomposes refractory organic matter, second sedimentation tank adds phosphorus removal agent to strengthen phosphorus removal;ozone unit deeply oxidizes residual pollutants and is equipped with backwashing device.The system significantly reduces reagent consumption and operating cost.

The application provides a device and method for regulating biological membrane niche to realize simultaneous methanogenesis and denitrification, and belongs to the technical field of water treatment, comprising a biological membrane reactor, a water distribution tank, a peristaltic pump, an aeration system and an electric stirrer, the biological membrane reactor is filled with biological membrane carriers, and an anoxic-anaerobic biological membrane layered structure can be formed inside the carriers. The application inoculates functional sludge, domesticates the biological membrane carriers, regulates aeration intensity to build a dissolved oxygen gradient, combines with microelectrode real-time monitoring of the dissolved oxygen and oxidation-reduction potential profile inside the carriers, realizes efficient cooperation of denitrifying bacteria and methanogenic bacteria in the same biological membrane reactor, integrates anaerobic digestion and denitrification process, has the advantages of low energy consumption, small land occupation and strong impact resistance, can simultaneously realize organic matter degradation and denitrification of high-concentration organic wastewater, optimizes carbon source utilization efficiency, reduces treatment cost, is suitable for treatment of various high-concentration organic wastewater, and has important theoretical innovation value and engineering application prospect.

This invention discloses a zoned permeable reactive barrier (PRB) for groundwater denitrification using a combination of zero-valent iron / slow-release carbon and zeolite, and its operating process. The PRB's structure comprises: (1) a quartz sand water distribution zone; (2) Fe... 0 / C-Denitrifying bacteria reaction zone; (3) Zeolite adsorption zone. This invention uses a mixture of biomass slow-release carbon and artificial slow-release carbon as a slow-release carbon source, and adds zero-valent iron to construct Fe 0 The / C system, using a mixed denitrifying bacteria agent for rapid start-up, and a zoned permeable reactive barrier (PRB) operation process for groundwater denitrification have been developed. This includes: filling processes based on different media permeability coefficients, reaction zone packing material compatibility based on different slow-release rates, and operating parameters based on different groundwater nitrogen pollutant concentrations. This invention improves the adaptability of the PRB process to hydrogeological conditions, accelerates the start-up of the denitrification process, ensures denitrification effectiveness during the start-up phase, improves denitrification efficiency during operation, and extends remediation time.

The present application belongs to the technical field of water treatment and environmental engineering, in particular to a gradient water flushing-chemical preservation backwashing method and device for a denitrification biofilter, comprising a cylinder and a flushing assembly arranged on a base; the cylinder is sequentially provided with a bottom water inlet area, a middle filler area and a top water outlet area from bottom to top; the top of the water outlet area is provided with a water outlet pipe; the bottom of the water inlet area is provided with a water inlet pipe; the inside of the filler area is provided with a perforated plate for loading filter material; the flushing assembly is arranged on the cylinder and used for flushing the filter material; through the gradient hydraulic design of "low-high-low", the present application realizes fine cleaning from top to bottom, compared with traditional single water flushing, can effectively remove the blockages, through the optimization of the starting and ending stages, significantly reduces the impact on the functional biofilm, and better preserves the denitrifying bacteria.

This invention provides a method and apparatus for deep nitrogen removal from low C / N ratio wastewater using a coupled sulfur-iron autotrophic denitrification process, belonging to the field of advanced wastewater treatment technology. The method includes inoculating sludge into a hydrolysis-acidification reactor and a sulfur-iron autotrophic denitrification reactor, respectively; adding biofilm packing and hydrolytic enzyme packing to the hydrolysis-acidification reactor; adding sulfur-iron packing to the sulfur-iron autotrophic denitrification reactor; pumping effluent into the hydrolysis-acidification reactor for preliminary denitrification to form a pretreated product; and sending the pretreated product from the hydrolysis-acidification process into the sulfur-iron autotrophic denitrification reactor for deep autotrophic denitrification. This coupling of the hydrolysis-acidification reactor and the sulfur-iron autotrophic denitrification reactor allows denitrifying bacteria to remove most of the nitrate nitrogen from the hydrolyzed organic matter. The sulfur-iron autotrophic denitrification process, because it does not require an external organic carbon source, has advantages such as reduced organic matter residue, less sludge production, lower sludge treatment costs, good denitrification effect, and less secondary pollution.

This invention discloses a reactor, method, and application for the graded enrichment of functional microorganisms, belonging to the field of wastewater biological treatment technology. The method combines a composite packing frame, a two-stage sedimentation tank, and controlled operating conditions to create a multi-gradient distribution environment of sludge settling properties, sludge age, dissolved oxygen, and substrate concentration under continuous flow operation. This forms multiple micro-niche areas, such as suspended zones, packing attachment zones, and sedimentation zones, thereby achieving graded enrichment of different functional microorganisms within a single reactor. Each zone is enriched with functional microbial communities including organic matter hydrolyzing bacteria, ammonia-oxidizing archaea, aerobic denitrifying bacteria, autotrophic denitrifying bacteria, iron-oxidizing-reducing bacteria, and sulfur-oxidizing-reducing bacteria, achieving synergistic coupling of multiple metabolic pathways. This invention achieves multifunctional microbial synergy without the need for multi-stage reactors or complex process segments, improving pollutant removal efficiency and multi-element cycling processes. It has the advantages of stable operation, strong adaptability, and ease of engineering application.

The application discloses a kind of sewage treatment plant residual sludge denitrification digestion methods, belong to sludge treatment technical field.The method is introduced into the sludge pool of sewage treatment plant with nitrate nitrogen material, and mix with residual sludge in pool;Denitrifying bacteria group in sludge is with organic matter carried by sludge itself as carbon source, nitrate nitrogen is reduced to nitrogen;Organic matter in sludge is oxidized and decomposed in the reaction process, realize the inorganic of sludge, stabilization and reduction.The application does not need to purchase carbon source and commercial bacterial agent, utilize existing sludge pool, low investment, low operating cost.Nitrate nitrogen material can be derived from in-plant nitrification liquid, external nitrate-containing waste liquid, NO2 generated by catalytic oxidation of ammonia-containing waste material etc..Sludge pool can be used as resource utilization workshop, and a variety of waste is treated in coordination, and the application method of concentrated residual sludge in denitrification treatment submitted on the same day forms technical complementation.

The application discloses a river sewage treatment method and a treatment agent, and belongs to the technical field of sewage treatment. The river sewage treatment agent is obtained by fixing and compounding microbial liquid with modified polyurethane foam as a carrier, wherein the modified polyurethane foam comprises a magnetic hydrophilic polyurethane foaming framework and a polyethylene imine crosslinking layer loaded on the surface of the foaming framework; the compounding microbial liquid is composed of polyphosphorus bacteria fermentation liquor, nitrifying bacteria fermentation liquor, denitrifying bacteria fermentation liquor and Rhodospirillum rubrum fermentation liquor in a certain volume ratio. By adding the treatment agent into a sequencing batch reactor at a certain volume filling rate, the chemical oxygen demand, ammonia nitrogen and total phosphorus in the river sewage can be efficiently removed; meanwhile, the magnetic response performance of the treatment agent can realize rapid recovery and reuse, and further reduces the treatment cost.

This invention discloses an apparatus and method for achieving deep nitrogen removal and phosphorus recovery through dual short-range coupled anammox fermentation using in-situ sludge fermentation. First, calcium chloride solution is added to the anammox reactor at the rear end of a two-stage PNA process to form recoverable phosphorus crystals such as Ca-P precipitates. Anaerobic ammonia oxidizing bacteria attach to the surface of the precipitates, thereby enriching and retaining them within the anammox reactor. During the continuous formation of anaerobic ammonia oxidizing particles, unfermented waste activated sludge is added to the PNA process. The slow hydrolysis and acidification of the waste activated sludge provide a carbon source for the short-range denitrifying bacteria, completing the transformation from single-stage PNA autotrophic nitrogen removal to dual short-range coupled anammox synergistic nitrogen removal. In this invention, the anaerobic ammonia oxidizing bacteria in the granular sludge after operation can reach 12%, 73% of the sludge exhibits a particle size greater than 200 μm, and the total nitrogen removal rate remains above 90%, with most phosphorus existing in the recoverable form of Ca-P crystals.

The application relates to a low-temperature aerobic denitrifying Pseudomonas ciliicola Pseudomonas silesiensis W2-12b and application thereof belong to the field of microbial technology. The strain expands the resource library of aerobic denitrifying bacteria in a polar low-temperature environment, and provides theoretical support for revealing the aerobic denitrifying mechanism under cold conditions and optimizing the sewage treatment process in cold regions.

This invention belongs to the field of aquatic ecological restoration technology, specifically relating to a wetland buffer zone system based on a polyhydroxyalkanoate-induced denitrifying bacteria system. The system includes: a wetland buffer zone substrate with a sloping top surface; several emergent plants planted on the slope of the substrate; a denitrifying bacteria system comprising several polyhydroxyalkanoate strips embedded in the substrate; and several partitions with mesh openings embedded in the substrate. The slow-release properties of the polyhydroxyalkanoate and the periodic metabolism of the emergent plants ensure the long-term activity of the denitrifying bacteria, while the structural partitions ensure the system's stability under complex hydraulic conditions. This invention combines the advantages of efficient nitrogen removal, ecological restoration, and low maintenance costs, making it suitable for river and lake buffer zones, constructed wetlands, and other similar applications.

The application discloses a kind of composite microbial carrier particles for river ammonia nitrogen treatment and preparation method thereof, the particle includes four-layer structure successively from inside to outside, magnetic counterweight inner core, slow-release function middle layer, composite bacterial population active layer and gel protective shell;Magnetic counterweight inner core is iron oxide-based particle;Slow-release function middle layer includes porous adsorption component, calcium peroxide slow-release microcapsule, slow-release alkaline carbonate component and sodium alginate adhesive, actively build oxygen supply, carbon source supply and pH self-buffering microenvironment in the particle interior;Composite bacterial population active layer is loaded with ammonia-oxidizing bacteria and heterotrophic nitrification-aerobic denitrifying bacteria mixed at a volume ratio of 2:1 to 3:1;Gel protective shell is formed by gel component containing porogen through calcium ion crosslinking solidification.The application can be directly thrown and added, while achieving multiple functions such as anti-scour, anti-predation, low DO adaptation, ammonia nitrogen and total nitrogen synergistic removal, etc., with stable treatment effect, simple construction and low cost.

This invention discloses a method for treating anaerobic ammonia oxidation wastewater based on a slow-release carbon source material, belonging to the field of wastewater treatment technology. The invention first mixes denitrifying bacterial sludge with sodium alginate solution, then solidifies it through calcium ion cross-linking to form microcapsules; lecithin, sodium acetate, and water are mixed to prepare an emulsion; after mixing the emulsion with the microcapsules, recycled oil is added for emulsification and homogenization, ultimately obtaining the slow-release carbon source material. This invention applies the slow-release carbon source material to an anaerobic ammonia oxidation system, achieving the slow and continuous release of sodium acetate and the targeted enrichment of denitrifying bacteria. While effectively removing accumulated nitrates, it avoids carbon source shock and bacterial competition, thus reducing NO2... ‑ -N and NH4 + The removal rate of -N remained stable at over 88%.

This invention provides a short-cut denitrification coupled with anaerobic ammonia oxidation composite biofilm based on carbon load regulation, its preparation method, and its application, belonging to the field of wastewater treatment technology. The method of this invention includes the following steps: adding biofilm packing material enriched with denitrifying bacteria inside a sequencing batch reactor (SBR); adjusting the influent flow rate and carbon source dosage; gradually reducing the influent carbon-to-nitrogen ratio (C / N ratio); and in-situ enriching anaerobic ammonia oxidizing bacteria on the biofilm packing material to form a composite biofilm with symbiotic short-cut denitrifying bacteria and anaerobic ammonia oxidizing bacteria. The gradual reduction of the influent C / N ratio includes multiple continuous and stable operation stages. This invention directionally enriches anaerobic ammonia oxidizing bacteria on existing denitrifying bacterial membranes, resulting in a strong synergistic effect of functional bacterial communities. Under a C / N ratio of 2.5, the anaerobic ammonia oxidation nitrogen removal contribution rate is ≥60%, and the total nitrogen removal rate is consistently above 70%. It has advantages such as no need for additional inoculation, short construction cycle, and stable nitrogen removal efficiency.

The application discloses a high-efficiency denitrification biological reaction device, which comprises an anoxic module, an anaerobic module and an aerobic precipitation coupling module which are sequentially connected, the anoxic module and the anaerobic module are each provided with a hydraulic baffling component for conveying sludge water, and the sludge water of the aerobic precipitation coupling module is backflowed to the anoxic module via an aerobic tail gas power component; the aerobic precipitation coupling module can be used for separating clarified water, sludge water and tail gas; the biological reaction device is filled with activated sludge, the activated sludge contains denitrifying bacteria, phosphorus accumulating bacteria, nitrifying bacteria and aerobic bacteria, and the activated sludge is located at the bottom of the anoxic module, the anaerobic module and the aerobic precipitation coupling module; and the biological reaction device can efficiently treat sewage and has the characteristics of simple structure, small land occupation and low cost.

The application discloses a biological filler for nitrogen removal enhancement of an aerobic tank and a preparation and application thereof, and successfully solves the problem of weak activity of denitrifying bacteria by loading three-layer biological fillers of inner-layer-denitrifying bacteria, middle-layer-conductive layer and outer-layer-nitrifying bacteria on the filler, and realizes rapid formation of a biofilm. In addition, a metal conductive layer is additionally arranged in the middle to participate in electron transfer in the microbial denitrification process, and the biofilm layers on both sides realize rapid formation of the biofilm, so as to realize nitrogen conversion and removal. The method can not only maintain the biological activity of the bacterial cells and realize rapid formation of the biofilm, but also promote separation of the bacterial cells and refractory organic matters, thereby reducing the toxic effect on the bacterial cells.

The application relates to a low-temperature aerobic denitrifying Pseudomonas sp. ND2-8 and application thereof, and belongs to the technical field of microorganisms. Pseudomonas The strain expands the resource library of aerobic denitrifying bacteria in a polar low-temperature environment, and provides theoretical support for revealing the aerobic denitrifying mechanism under cold conditions and optimizing the sewage treatment process in cold regions.

The invention relates to the technical field of sewage treatment, in particular to a composite biological filler and a preparation method thereof.The composite biological filler comprises a filler body, and the filler body is of a three-dimensional staggered structure formed by mixing and weaving basalt fibers and composite filaments; the composite filament comprises a biodegradable polymer matrix, and the biodegradable polymer matrix can degrade in a water environment to release small organic molecules; the biodegradable polymer matrix is introduced into the composite filament, so that small organic molecules can be continuously and stably degraded and released in a water environment, a long-term electron donor is provided for denitrifying bacteria, the core pain point of insufficient carbon source in a wastewater denitrification process is perfectly solved, the addition amount of an external carbon source is reduced, and the nitrogen removal efficiency is improved. The treatment cost and the risk of secondary pollution are obviously reduced; meanwhile, the slow-release carbon source can remarkably promote attachment growth of microorganisms on the surface of the filler, the filler biofilm formation speed is increased, the three-day biofilm formation amount can be two times or above that of commercially available filler, and the starting speed and stability of a biological treatment system are greatly improved.

This invention discloses a method for cultivating aerobic granular sludge using simulated pig farm wastewater and its application. High-concentration simulated pig farm wastewater is selected as raw material, starting with flocculent activated sludge. The aerobic and anoxic environments required by nitrifying bacteria, polyphosphate-accumulating bacteria, and denitrifying bacteria are balanced through the addition of anaerobic retention and intermittent aeration. During the cultivation process, activated carbon, a nucleating agent with higher porosity and specific surface area, is added to promote the attachment and aggregation of the flocculent activated sludge. Mature aerobic granular sludge can be cultivated in approximately 70 days. Furthermore, the cultivated aerobic granular sludge exhibits rich microbial content, good settling performance, and stable sludge structure, demonstrating strong application potential in the field of pig farm wastewater treatment.

This invention discloses a circulating high-efficiency denitrification bioreactor. The bioreactor is filled with activated sludge containing denitrifying bacteria, polyphosphate-accumulating bacteria, nitrifying bacteria, and aerobic bacteria. The bioreactor includes: an anoxic module; an anaerobic module; and an aerobic sedimentation coupling module for separating clarified water, activated sludge, and exhaust gas. The anoxic module, anaerobic module, and aerobic sedimentation coupling module are sequentially connected. Both the anoxic and anaerobic modules are equipped with agitators for stirring the activated sludge. The activated sludge from the aerobic sedimentation coupling module is returned to the anoxic module via an aerobic exhaust gas power component. The bioreactor of this invention can efficiently treat wastewater and has the characteristics of simple structure, small size, and low cost.