8 results about "Ammonia-oxidizing 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 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.

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.

This invention relates to the field of wastewater denitrification technology, and particularly to a method based on S n 2‑ A method and system for one-stage PD / A deep denitrification using a mediated effect includes: constructing a biofilm reaction system by setting up a biofilm carrier component and inoculating it with activated sludge in a continuous flow reactor; simulating the preparation of wastewater effluent containing nitrate nitrogen and introducing a polysulfide solution as an electron donor, then independently and continuously adding both to the continuous flow reactor and mixing them uniformly by stirring; adding ammonia nitrogen to the wastewater effluent and inducing in-situ enrichment of anaerobic ammonia oxidizing bacteria in the biofilm reaction system by staged control of the ammonia nitrogen load in the wastewater effluent; and achieving stable coupling of short-cut denitrification and anaerobic ammonia oxidation in a one-stage continuous flow reactor to simultaneously remove nitrate nitrogen and ammonia nitrogen from the wastewater effluent. This invention features a simple start-up method, stable operation, low dependence on external organic carbon sources, and low sludge yield, making it suitable for deep denitrification treatment of urban wastewater with low carbon-to-nitrogen ratios and wastewater treatment plant effluent.

This invention discloses a deep denitrification device and its start-up method based on full-process ammonia oxidation coupled with sulfur autotrophic denitrification, belonging to the field of wastewater biological treatment technology. First, sludge containing full-process ammonia oxidizing bacteria is inoculated into the reactor; then, wastewater containing ammonia nitrogen is continuously introduced, gradually increasing the ammonia nitrogen concentration to enrich the full-process ammonia oxidizing bacteria; finally, sulfide is added to the influent, gradually increasing the sulfide concentration to enrich sulfur autotrophic denitrifying bacteria. The full-process ammonia oxidizing bacteria convert ammonia nitrogen into nitrate nitrogen, and the sulfur autotrophic denitrifying bacteria further convert nitrate nitrogen into nitrogen gas. Both work synergistically in the same reactor to achieve deep denitrification. This invention requires no aeration and no external carbon source during operation, significantly reducing energy consumption and operating costs.

This invention relates to the field of wastewater treatment technology, and more particularly to a method for enhancing anaerobic ammonia oxidation (AAO) denitrification using iron-loaded polyurethane porous materials. The method includes the following steps: Anaerobic ammonia oxidation sludge, iron-loaded polyurethane porous materials, and wastewater containing ammonia nitrogen and nitrite nitrogen are thoroughly mixed in an anaerobic reactor and reacted under anaerobic conditions at a temperature of 31-35°C. The iron-loaded polyurethane porous materials are prepared as follows: polyurethane sponge is selected as a carrier, cut and cleaned, and then immersed and stirred in a mixed iron salt solution for a period of time. The pH of the mixed solution is adjusted to alkaline, resulting in the formation of a red precipitate. The iron-loaded polyurethane porous materials are then hydrothermally synthesized. The mixed iron salt solution includes ferric chloride and ferric nitrate. The carrier material prepared by this invention, when applied to an anaerobic ammonia oxidation system, can effectively shorten the process start-up time, promote the enrichment and biofilm formation of anaerobic ammonia oxidizing bacteria, and achieve a high total nitrogen removal rate.

This invention discloses a membrane bioreactor for enriching high-purity suspended anaerobic ammonia oxidizing bacteria and its application in enriching anaerobic ammonia oxidizing bacteria from particulate to high-purity suspended state. The membrane bioreactor for enriching high-purity suspended anaerobic ammonia oxidizing bacteria includes a reactor body; a transverse diaphragm is provided within the reactor body; the area above the transverse diaphragm is a membrane separation effluent zone; a membrane module is installed within the membrane separation effluent zone, connected to a membrane outlet; an exhaust pipe is located at the top of the membrane separation effluent zone; and a sludge discharge port is located at the bottom of the membrane separation effluent zone near the transverse diaphragm; a conical component, wider at the top and narrower at the bottom, is connected to the bottom of the transverse diaphragm; a jet pipe passes through the transverse diaphragm around the conical component; the bottom opening of the jet pipe is higher than the lowest point of the conical component, and the top opening faces the membrane module; the vertical area within the reactor body corresponding to the conical component is a gas-liquid-solid separation zone; and the area below the gas-liquid-solid separation zone within the reactor body is the anaerobic ammonia oxidation reaction zone.

The present application relates to sewage treatment technical field, specifically short nitrification coupling MABR ammonia nitrogen wastewater treatment system and treatment method, including raw water regulating unit, MABR reaction unit, sedimentation separation unit, aeration and reflux unit, dosing unit and tail gas recycling unit, the present application utilizes the unique biological membrane inner layer anoxic environment of MABR membrane assembly, realizes simultaneous short nitrification denitrification, does not need to add carbon source for low carbon nitrogen ratio wastewater, completely eliminates carbon source adding cost, the heater set in raw water tank can accurately adjust raw water temperature, combines short nitrification parameter optimization, utilizes the biological characteristics that the degree of inhibition of ammonia oxidizing bacteria activity is far less than nitrite oxidizing bacteria under low temperature environment, so that the system can still realize more than 80% denitrification efficiency under low temperature condition, breaks through the low temperature bottleneck of traditional denitrification process.