26results about How to "Improve nitrogen removal efficiency" patented technology

The invention discloses a sewage plant tail water treatment system and method, and relates to the technical field of sewage treatment.The sewage plant tail water treatment system is applied to tail water generated by a sewage plant adopting an ozone advanced oxidation technology, and the treatment system comprises an activated carbon reaction device, a denitrification reaction device, an ecological pond and a horizontal subsurface flow wetland; the activated carbon reaction device is communicated with the tail water pipe and comprises an activated carbon filtering layer, and the activated carbon filtering layer is used for adsorbing chemical oxygen demand and dissolved oxygen in tail water; the denitrification reaction device is communicated with the activated carbon reaction device and comprises a denitrification filter material layer, and the denitrification filter material layer is used for autotrophic denitrification nitrogen removal of tail water; the ecological pond is communicated with the denitrification reaction device and comprises aquatic plants and aquatic animals; the horizontal subsurface flow wetland is communicated with the ecological pond and is used for deeply filtering the tail water. The treatment system can improve the purification effect of the tail water of the sewage plant.

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 application relates to the field of carbon source materials, and in particular to a composite carbon source for enhancing the denitrification capacity of activated sludge, its preparation method, and its application. The composite carbon source for enhancing the denitrification capacity of activated sludge, by weight, comprises: 45-60 parts of fast-acting carbon source, 10-15 parts of long-acting carbon source, 9-16 parts of synergist, 0.2-0.5 parts of activator, 4-8 parts of composite functional agent, and 20-25 parts of deionized water. This composite carbon source effectively promotes the denitrification start-up speed, provides a stable and continuous carbon source supply, effectively avoids the defects of traditional carbon sources such as excessive supply in the early stage and insufficient supply in the later stage, and ensures efficient operation of the entire denitrification process. It is safe and convenient to use, non-toxic, and poses no risk of combustion or explosion. Storage and addition are simple, significantly reducing on-site operational safety risks. The carbon release process is stable and controllable, and multiple slow-release mechanisms enable flexible regulation of the carbon source release rate to match the denitrification requirements under different operating conditions.

The present application relates to high ammonia nitrogen wastewater treatment technical field, especially in one kind of integrated autotrophic denitrification device and method, wherein, one kind of integrated autotrophic denitrification device includes: pretreatment component, short path nitrification component, anaerobic ammonia oxidation component, collection and sludge discharge component, process insulation component, identification monitoring component, identification and determination component;The identification and determination component is analyzed according to the real-time image of the anaerobic ammonia oxidation bacteria distribution obtained and issues corresponding adjustment signal, or, alarm signal, so that the operation parameters of the determining device each component are adjusted accordingly.The present application provides a kind of short path nitrification and anaerobic ammonia oxidation combination mode, realizes partial short path nitrification, solves the accumulation problem of anaerobic ammonia oxidation bacteria, provides anaerobic ammonia oxidation bacteria for short path nitrification system, improves denitrification efficiency, and the device is self-regulating, strengthens the stability of device operation, so that the device can be long-term and stable operation.

The utility model discloses a multi-source organic waste synergistic conversion sewage treatment composite carbon source system. The system comprises a kitchen waste pretreatment device, a waste pulp pretreatment device, an alcohol by-product pretreatment device, a polysaccharide by-product pretreatment device, a stirring sterilization treatment device and a collection and storage device. The kitchen waste pretreatment device, the waste pulp pretreatment device, the alcohol by-product pretreatment device and the polysaccharide by-product pretreatment device are respectively matched with the stirring sterilization treatment device; the stirring and sterilizing treatment device is matched with the collecting and storing device. Various organic wastes can be reasonably treated and compounded to be converted into a composite carbon source, and nutrient substances required by sewage treatment denitrification microorganisms are balanced, so that the sewage treatment cost can be reduced, and the denitrification efficiency can be improved; meanwhile, resource recovery and reutilization of organic waste are realized, so that the production cost of the composite carbon source is reduced, and the urgent demand of the sewage treatment industry on the high-efficiency and low-cost carbon source can be met.

The application relates to the technical field of wastewater denitrification, and discloses a composite carrier as well as a preparation method and application thereof. The composite carrier comprises porous molybdenum disulfide, the porous structure of the molybdenum disulfide in-situ grows zirconium metal organic frameworks, and the surface of the molybdenum disulfide is loaded with graphene. The composite carrier can not only serve as a place for denitrification of microorganisms, but also can improve the denitrification efficiency of the microorganisms.

The invention belongs to the technical field of chemical engineering separation, and provides a natural eutectic solvent and a preparation method and application thereof, the natural eutectic solvent comprises the following components: caprolactam, citric acid and water; wherein the molar ratio of caprolactam to citric acid is (1-4): (1-2); the mass of the water is 20-40% of the sum of the mass of the caprolactam and the mass of the citric acid. By introducing water as a third component, the viscosity of the system is effectively reduced, the mass transfer performance is improved, and the denitrification efficiency is improved. The eutecticevaporate solvent provided by the invention can provide more reaction sites, has relatively strong removal capacity and selectivity on nitrogenous organic matters, and can realize efficient denitrification under mild conditions. The natural deep-eutectic solvent prepared by the preparation method disclosed by the invention is applied to removal of basic nitrides of oil products, and has the advantages of short time consumption and low dosage, namely high removal efficiency.

An aeration tank and a sewage treatment system are characterized in that an anoxic regulation and control mechanism and an aerobic regulation and control mechanism are arranged in an aeration tank body, the anoxic regulation and control mechanism can create an anoxic environment around the anoxic regulation and control mechanism so that the area becomes an anoxic section, and the aerobic regulation and control mechanism creates an aerobic environment around the aerobic regulation and control mechanism so that the area forms an aerobic section; in the process that sewage flows along the channel, the sewage sequentially passes through the anoxic zone and the aerobic zone, in the anoxic zone, most nitrate radicals and nitrite radicals in the sewage are reduced into nitrogen by denitrifying bacteria in activated sludge, and nitrogen elements in the sewage are removed; in the aerobic section, most ammonium nitrogen in the sewage is converted into nitrate and nitrite by nitrifying bacteria in the activated sludge, and nitrogen in the sewage is further converted and removed; the denitrification effect of the anoxic section and the nitrification effect of the aerobic section are synergistically carried out, so that nitrogen elements in sewage can be more effectively removed, the denitrification efficiency is greatly improved, up-to-standard discharge of the sewage is ensured, and eutrophication pollution to a water body is reduced.

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 sewage treatment method can greatly reduce the sludge amount, and comprises the following steps: step 1, flocculants and magnetic powders are added into sewage to be treated, after magnetic flocculation, precipitation and magnetic separation recovery, preliminary purified water is obtained; step 2, microbial mixed stock solution containing anaerobic ammonia oxidation bacteria and aerobic granular sludge carriers are added into the preliminary purified water, and aeration and non-aeration cultivation reactions are alternately carried out in a sequencing batch reactor, so that water degradation and purification are completed, wherein, protozoa are added on the 2nd-3rd day of the cultivation reaction, metazoan is added on the 4th-5th day of the cultivation reaction, and the reactor enters a stable operation period on the 6th-14th day of the cultivation reaction; and step 3, the water after the reaction is sequentially subjected to filtration and disinfection treatment, and reaches the water standard; by constructing a complete micro-animal food chain from functional bacteria to protozoa and metazoan, and by utilizing the predation of higher micro-animals on lower microorganisms, the sludge is in-situ reduced, and the environmental and economic benefits are achieved.

This invention provides a method for preparing a biological denitrification composite carbon source for wastewater treatment plants, belonging to the field of wastewater treatment. The method includes the following steps: 1. Crushing kitchen waste residue, treating it in boiling water, cooling it, and then fermenting it to obtain a carbon source fermentation broth; 2. Filtering the carbon source fermentation broth, adding an accelerator and straw fragments to the liquid-phase carbon source broth to obtain a liquid-phase carbon source, mixing the liquid-phase carbon source and solid-phase carbon source evenly, and crushing them to obtain a carbon source mixture; 3. Spraying an alkenylated polyvinyl alcohol solution onto the surface of the carbon source mixture, molding it, and drying it to obtain the aforementioned biological denitrification composite carbon source for wastewater treatment plants. The biological denitrification composite carbon source prepared by this invention can simultaneously and slowly release the solid and liquid components in the carbon source fermentation broth, and also promotes the effective utilization of the carbon source by denitrifying bacteria, exhibiting good denitrification utilization.

This invention relates to the field of wastewater treatment technology, and more particularly to an intelligent wastewater treatment method. Wastewater is introduced into the anaerobic section of a biological treatment zone, which includes at least a first anaerobic section and a second anaerobic section connected in series. The wastewater is controlled to enter the second anaerobic section. After treatment in the anaerobic section, the wastewater enters an aerobic section for nitrification and phosphorus uptake. After treatment in the anoxic section, the wastewater enters a secondary sedimentation tank for solid-liquid separation. The sludge settled at the bottom of the secondary sedimentation tank is returned to the front end of the first anaerobic section at a first return ratio. The sludge settled at the bottom of the secondary sedimentation tank is also returned to the front end of the anoxic section at a second return ratio. Once the microbial state is stable, the concentration parameters in the effluent from the first anaerobic section are monitored in real time, and the first or second return ratio is dynamically adjusted to maintain the first anaerobic section in an anaerobic environment suitable for internal carbon source metabolism. This invention solves the technical problem of insufficient utilization of internal carbon sources, requiring reliance on external carbon sources.

This invention discloses a method for acclimating aerobic activated sludge to start a short-cut nitrification-anaerobic ammonia oxidation process, comprising: S1. filling the reactor with activated carbon packing material and inoculating it with aerobic activated sludge; S2. introducing water into the reactor, wherein the concentration of ammonia nitrogen in the influent is 135-145 mg·L⁻¹. ‑1 The concentration of nitrite nitrogen is 0 mg·L⁻¹. ‑1 The influent was not deoxygenated; S3. Operate the reactor and control the reactive oxygen species concentration in stages: Stage I: Days 0-25, control the reactive oxygen species concentration to be 0.2 < DO ≤ 0.3 mg·L ‑1 Phase II: Days 26–60, maintain reactive oxygen species concentration at 0.3 < DO ≤ 0.5 mg·L⁻¹ ‑1 Phase III: Days 61–150, maintain reactive oxygen species concentration at 0.5 < DO ≤ 0.7 mg·L⁻¹ ‑1 Phase IV: Days 151–230, maintain reactive oxygen species concentration at 0.4 < DO ≤ 0.5 mg·L⁻¹ ‑1 The method of this invention achieves efficient enrichment of AOB and AnAOB and NOB suppression through the synergistic effect of dissolved oxygen gradient regulation and activated carbon packing, significantly shortening the start-up period; this method is suitable for denitrification treatment of wastewater with high ammonia nitrogen and low carbon-to-nitrogen ratio (C / N).

The present application relates to a kind of PNA-IFAS process and its device.The PNA-IFAS process includes: the sludge-water mixture obtained by mixing sewage with flocculation sludge with PNA activity, under the condition of aeration oxygenation, sludge-water mixture sequentially passes through fiber filler, polyethylene filler and polyurethane filler to complete denitrification, then through sludge-water separation to obtain sewage meeting discharge standard;Wherein, in the effective volume of reactor, the volume percentage of fiber filler is 1%-5%, the volume percentage of polyethylene filler is 10%-25%, and the volume percentage of polyurethane filler is 1%-5%.The PNA-IFAS process described in the present application adds flocculation sludge with PNA activity, and cooperates to control the proportion and order of mixed filler, so that the biomass in the reactor system is not easy to lose, the start-up time is fast, and the PNA-IFAS system is continuously and efficiently denitrified.

The application relates to the technical field of sewage treatment, and discloses a biological filter rotating disc system based on replaceable composite fillers and a nitrogen and phosphorus removal method. 2+ The biological filter rotating disc system supports online filler replacement and is suitable for upgrading and reconstruction of sewage plants and advanced treatment of industrial wastewater.

The invention relates to the technical field of sewage treatment, and discloses a method for treating chicken raising wastewater based on coupling of ultrasonic ozone and a sulfur autotrophic fungicide, which comprises the following steps: (1) performing ultrasonic-ozone combined pretreatment on the chicken raising wastewater; and (2) treating the effluent in an anaerobic reaction system containing a compound microbial agent and a sulfur-containing filler. According to the method, dephosphorization and wall breaking are enhanced through ultrasonic ozone, ammonia nitrogen is directly converted into nitrogen through the synergistic effect of the specially-made filler and the functional bacteria under the anaerobic condition, efficient nitrogen and phosphorus removal is achieved, the process is simplified, and operation is stable.

This application relates to a clean steel and its preparation method. The clean steel composition includes: C: ≤0.0030%; N ≤0.0020%. Such a pure composition meets the requirements of steel used in high-end fields. The method obtains clean steel through electric furnace smelting of all scrap steel or high scrap ratio steel, ladle refining process, continuous casting, heating, and rolling. It effectively controls the nitrogen and oxygen content in the molten steel, ensuring the high purity of the steel. In particular, at the end of the decarburization treatment of the RH vacuum circulation degassing refining process, a certain amount of methane is mixed into the bottom blowing gas. The methane reacts with the oxygen in the molten steel to generate a large number of CO bubbles, which enhances the stirring of the molten steel, promotes the flotation of inclusions, and improves the cleanliness of the molten steel. At the same time, the CO bubble effect improves the denitrification efficiency of the molten steel. Furthermore, since the methane gas consumes some of the oxygen in the molten steel, the oxygen content of the molten steel is reduced at the end of the decarburization treatment, thereby reducing the amount of aluminum alloy used for deoxidation and further improving the cleanliness of the molten steel.

The invention belongs to the technical field of water pollution treatment, and discloses a biological hybrid, a construction method thereof and application of the biological hybrid in denitrification nitrogen removal of high-salt nitrogen-containing wastewater, the biological hybrid is constructed by an H.titanicae BH1 strain and a MoS2 nano material, and the nitrate reduction rate of the constructed H.titanicae BH1 / MoS2 biological hybrid is remarkably improved compared with that of a single H.titanicae BH1 strain; meanwhile, the hybrid can enhance the denitrification process by improving the activity of a denitrification key enzyme, promoting the secretion of extracellular secretions (EPS) and enhancing the electron transfer performance, and shows high salt adaptability superior to that of a single strain within the salinity range of 2%-7%. The invention provides a novel microbial preparation and a technical scheme for efficient treatment of high-salt nitrogen-containing wastewater, has the advantages of high treatment efficiency, strong environmental adaptability, no secondary pollution and the like, and has a wide application prospect.

The invention provides high-low-potential wind energy unpowered rural domestic sewage treatment equipment and a use method, and belongs to the technical field of rural domestic sewage treatment.The equipment comprises a sewage feeding pipeline, an entanglement removing device, a follow-up treatment device and a wind energy assembly; rural domestic sewage containing entanglements flows into the entanglement removing device from the sewage feeding pipeline and is treated by the filtering assembly, the entanglements are left in the box body assembly, and the filtered sewage is converged into the water collecting block through the conveying assemblies and flows into the follow-up treatment device through the drainage pipeline to be treated. According to the invention, plastic bag type easily-entangled objects are separated from rural domestic sewage, so that the risk that the plastic bag type easily-entangled objects block a pipeline is reduced, the water quality is improved, and the environmental pollution is reduced. The entanglement removing device and the follow-up treatment device are both in an unpowered treatment mode, so that in the sewage treatment process, electric energy consumption is not needed, and the sewage treatment device needs to be built at any place and is not influenced by the surrounding environment, and the equipment is easy to install in rural areas.

The utility model discloses an integrated sewage treatment system relates to sewage treatment technical field, and this system includes the pretreatment unit, biochemical treatment unit, secondary treatment unit and sludge treatment unit that connect gradually, and biochemical treatment unit includes the anaerobic pool, the anoxic MBBR pool and CWSBR biological pool that connect gradually, and CWSBR biological pool includes the aerobic MBBR pool, reaction area and balance area that arrange gradually, and secondary treatment unit is used to carry out flocculation precipitation and filtration treatment to sewage, and sludge treatment unit is used to carry out centralized treatment to the sludge of each unit generation, the utility model discloses through multistage biochemical coupling and depth treatment combination, and the efficiency of denitrification and phosphorus removal and the anti -impact load capacity of a large margin are promoted, and the effluent quality is stable, and the sludge centralized disposal, and the system integration degree is high, and the land area is small, and the operation cost is low, is applicable to town sewage and industrial waste water treatment.

The application discloses a biochemical-ozone oxidation-biochemical coupling device for high-salt toxic wastewater, which comprises a primary denitrification membrane tank, a primary sedimentation tank, a primary ozone oxidation tank, a primary aerobic membrane tank, a secondary denitrification membrane tank, a secondary sedimentation tank, a secondary ozone oxidation tank, a secondary aerobic membrane tank and a water outlet supervision tank which are sequentially connected; a primary aerobic membrane tank internal reflux pipeline is connected between the primary aerobic membrane tank and the primary denitrification membrane tank; a coupling reflux pipeline is connected between the primary aerobic membrane tank and the primary sedimentation tank; a secondary aerobic membrane tank external reflux pipeline is connected between the water outlet supervision tank and the primary denitrification membrane tank; a water inlet pipeline for inputting high-salt toxic wastewater is connected to the primary denitrification membrane tank; and a water outlet pipeline is connected to the water outlet supervision tank. Through the multistage biochemical-ozone oxidation coupling process, the double inhibition and impact problems in the treatment of high-salt and high-toxicity wastewater are broken through, and the total ozone consumption is reduced by more than 20%; and the device is suitable for treating complex high-salt wastewater with a salinity of 3-15%.

The utility model discloses a secondary aluminium ash continuous denitrification system belongs to chemical equipment technical field, including premixer and continuous denitrification reactor, the import of premixer is connected secondary aluminium ash bin and auxiliary material bin respectively, is equipped with feed inlet, denitrogenization aluminium ash export and gas phase export on continuous denitrification reactor, and the outlet of premixer is connected with the feed inlet respectively and initiates material pipe, and denitrogenization aluminium ash export connects the extraction kettle, and gas phase export connects dust removal device, and the dust collection outlet of dust removal device is connected secondary aluminium ash bin. The utility model discloses a premixer and continuous denitrification reactor combination, and the high efficiency of secondary aluminium ash denitrification and the continuity of production are given full consideration to, can shorten the reaction length effectively, improves the denitrification processing capacity of secondary aluminium ash simultaneously.

This invention relates to an apparatus and method for rapidly inhibiting nitrite-oxidizing bacteria to achieve deep nitrogen and phosphorus removal in urban wastewater, belonging to the field of biological wastewater treatment. The apparatus includes an influent reactor unit, an influent unit, an aeration unit, and an effluent unit. The method operates a short-cut nitrification / anaerobic ammonium oxidation system with low nitrogen and phosphorus removal efficiency due to the proliferation of nitrite-oxidizing bacteria in an anaerobic-aerobic-anoxic mode. By controlling the aerobic and anoxic time distributions, the nitrite accumulation rate in the aerobic section of the system is rapidly increased, reducing the total nitrogen and phosphate content in the effluent. This invention, by changing the operating mode, rapidly inhibits nitrite-oxidizing bacteria, improves the nitrogen and phosphorus removal efficiency of the short-cut nitrification / anaerobic ammonium oxidation system operating in an anaerobic-aerobic-anoxic mode, achieves deep nitrogen and phosphorus removal in urban wastewater with a low C / N ratio, and ensures stable operation. The operation and control are simple, requiring no external energy, thus saving energy and reducing consumption.

This application provides a method and system for treating domestic sewage, belonging to the field of sewage treatment technology. The method includes the following steps: S1: The domestic sewage to be treated flows sequentially through an anoxic reaction tank and an aerobic reaction tank, both tanks being filled with multi-metal catalytic functional packing material; S2: The effluent is introduced into a membrane separation tank for sludge-water separation to obtain treated water and sludge; S3: A portion of the sludge generated in the membrane separation tank is returned to the anoxic reaction tank; S4: A portion of the treated water is extracted and introduced into a functional water preparation unit to generate functional water; S5: The functional water is divided into a first path and a second path in a certain proportion, with the first path flowing into the bottom of the membrane separation tank and the second path flowing into the aerobic reaction tank. This invention enhances the nitrogen and phosphorus removal effect through multi-metal catalytic functional packing material, and utilizes the aeration and flushing effect of functional water to alleviate membrane fouling in the membrane separation tank, extending the membrane's service life. The resulting effluent quality is stable and meets current domestic sewage discharge requirements.

This invention belongs to the field of water treatment denitrification technology, specifically relating to a strain-piezoelectric material synergistic denitrification system and its application. This strain-piezoelectric material synergistic denitrification system includes *Streptomyces* denitrifying bacteria and barium strontium titanate, with the barium strontium titanate loaded on the surface of the *Streptomyces* denitrifying bacteria. This invention induces a piezoelectric effect in the barium strontium titanate through mechanical feeding, providing an electron donor for the *Streptomyces* denitrifying bacteria, thus improving electron transfer efficiency and consequently increasing denitrification efficiency. Experiments show that under optimal conditions of 0.5 g / L barium strontium titanate concentration and 400 r / min stirring speed, the total nitrogen and nitrate nitrogen removal rates of this system are higher than those of strain DD alone, while the total organic carbon removal rate is also significantly improved.