10results about How to "Improve denitrification effect" patented technology

The application provides a method and device for treating wastewater by combining a suspended filler floating bed and a soil infiltration system, and the method comprises the following steps: S1, breeding wastewater is treated by the suspended filler floating bed after passing through a hydrolysis tank, and effluent is treated in a sedimentation tank, and wastewater of the suspended filler floating bed is returned to the suspended filler floating bed for secondary treatment; S2, wastewater of the sedimentation tank is returned to the hydrolysis tank; and S3, effluent of the sedimentation tank is introduced into a soil underground infiltration system. The system provided by the application is beneficial to further strengthening the effects of denitrification, phosphorus removal and removal of suspended solids, and solves the problems of low dissolved oxygen content of influent and wastewater in the system, which is not conducive to the growth of nitrifying bacteria, and low effective volume utilization rate. In the use process, the filler does not need to be replaced, and mechanical aeration equipment does not need to be added, and the system has the advantages of low investment cost, no need to add chemical agents for treatment, obvious effect, not easy to breed mosquitoes, simple operation and management, and beautification of the environment, and has remarkable ecological and economic benefits for promoting deep purification of breeding wastewater.

This invention discloses a decentralized airlift reoxygenation circulating biological denitrification wastewater treatment device, employing an integrated inner and outer cylinder design, encompassing wastewater treatment, sludge-water separation, and discharge, with a complete process and reasonable structure. The area between the inner and outer cylinders forms a circular wastewater treatment zone with circulating flow, encompassing a two-stage AO biological denitrification process. It eliminates the need for nitrification liquor recirculation, exhibiting excellent denitrification effect, resistance to shock loads, and ease of management. The inner side of the inner cylinder serves as a sedimentation zone, with periodic manual or mobile sludge removal. An airlift device provides circulation power and pre-oxygenation; the circulating water volume is adjusted by regulating the air supply, thereby controlling the nitrification liquor recirculation ratio. The device consumes only one air pump, which supplies air to both the airlift device and the aeration device, resulting in low investment, low energy consumption, and easy management. Fixed supports and rope-type fiber packing are installed throughout the wastewater treatment zone, effectively preventing packing blockage and short-circuiting problems, and facilitating the timely discharge of detached biofilm.

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.

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 present application relates to sewage treatment technical field, disclose a kind of membrane aeration biological membrane reactor's operating method and operating device, sewage treatment system.The operating method has at least one control cycle during the continuous operation of reactor, the cycle includes: pre-control step, provide negative pressure pulse to membrane assembly inside, the normal compressive stress directed to membrane silk inside is applied to the biological membrane attached to the outer surface of membrane, so that the microstrain of outer layer structure is generated;Fluidized cutting step, add and fluidize circulating cutting microparticles to reactor, and microparticles are rolled cutting to the surface of biological membrane under the driving of fluid.By the cutting action of cutting microparticle and negative pressure pulse, the outer layer of biological membrane is selectively stripped from invalid biomass.The present application realizes the fine control from inside to outside to biological membrane under the condition of not interrupting sewage treatment process, can long-term maintain biological membrane in thin, high-activity ideal mass transfer state, effectively solve the problem that mass transfer efficiency attenuates with operating time.

The utility model discloses an efficient reaction device for nitrogen removal of a gaseous carbon source. The efficient reaction device comprises a reaction kettle, a base, a stirring mechanism, a temperature control assembly and monitoring equipment, two first hinge seats are respectively mounted on two sides of the outer wall of the reaction kettle; the top of the reaction kettle is provided with a detection port and a sample inlet, and the bottom is provided with a discharge port; a stratified sampling assembly is mounted on the side wall of the reaction kettle; four second hinge seats are mounted on the top surface of the base, and electric push rods are hinged between the first hinge seats and the second hinge seats; the stirring mechanism comprises an electric shaft assembly, a first stirring assembly and a second stirring assembly; and the electric shaft assembly is rotationally connected into the reaction kettle. According to the utility model, the angle of the reaction kettle can be flexibly adjusted, the stirring range is expanded, the stirring efficiency is improved, and the gas-liquid-sludge three-phase mass transfer efficiency is accelerated, so that the activated sludge reaction rate is improved, the sewage denitrification efficiency is accelerated, the treatment period is shortened, and efficient denitrification of a gaseous carbon source is realized.

The utility model discloses a kind of efficient multi-path denitrification device based on biological filler setting optimization, it is related to water treatment technical field, including shell, the lateral wall of shell is connected and is installed with water inlet pipe, five The partition plate separates the shell cavity of shell into anaerobic pool, primary anoxic pool, secondary anoxic pool, primary aerobic pool, secondary aerobic pool and sedimentation tank;In the utility model, by being provided with iron autotrophic denitrification filler porous suspended filler, due to its own structural characteristics, its dissolved oxygen concentration gradient not only exists in the formed biofilm, but also there is dissolved oxygen concentration gradient from the surface layer to the inner layer of filler, so that the nitrous acid bacteria and nitrate bacteria of inner layer are in low dissolved oxygen environment for a long time, a large amount of accumulation of nitrogen dioxide is realized by short path nitrification reaction, by the reasonable configuration of filler, it can effectively improve denitrification effect, ensure the normal operation of processing facility and stable discharge standard.

The application discloses a low-temperature denitration catalyst and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. 60 The catalyst is prepared by doping fullerene C 60 The pi electron system of C 60 is highly delocalized on the three-dimensional curved surface thereof, so that C 60 has excellent electron transfer capacity; and the doping proportion of C 60 can effectively promote the rapid progress of the catalytic reaction. Therefore, the catalyst prepared by the application can be applied to low-temperature flue gas denitration, can significantly improve the denitration efficiency, can widen the active temperature range of the catalyst, and can solve the problems of poor low-temperature activity, insufficient sulfur resistance and easy poisoning of traditional catalysts.

A nitrogen-adsorption gel material, its preparation, and its application are disclosed. The nitrogen-adsorption gel material comprises a porous network structure cross-linked with polyvinyl alcohol and phytic acid, and the porous network structure is loaded with zeolite particles. The preparation method involves adding zeolite to a copolymer solution of polyvinyl alcohol and phytic acid under alkaline conditions, and then adding a cross-linking agent to the resulting polyvinyl alcohol-phytic acid-zeolite mixture for cross-linking and curing. The cross-linked and cured mixture is subjected to liquid-solid separation, and the solids after liquid-solid separation are washed until the pH is neutral. The nitrogen-adsorption gel material is used to reduce the ammonia nitrogen content in water bodies through adsorption, or added to a bioreactor to couple a biological reaction for deep denitrification. The material of this invention has good sphericity and excellent ammonia nitrogen adsorption performance.