79results about How to "Improve denitrification ability" patented technology

The invention discloses a treatment method for biological nitrogen removal of reinforced sewage, which comprises the following steps of: 1, feeding all or partial treated sewage and sludge refluxed from a secondary sedimentation tank into a reflux sludge denitrification unit together by adopting division point inflow; 2, feeding the outflow of the reflux sludge denitrification unit and the residual sewage to an anaerobic unit or an anoxic unit; 3, feeding the outflow of the anaerobic unit to the anoxic unit, and refluxing the mixed solution of an aerobic unit to the anoxic unit; 4, feeding the outflow of the anoxic unit to a transition unit; 5, feeding the outflow of the transition unit to the aerobic unit, and refluxing the mixed solution of the aerobic unit to the anoxic unit from the outflow end of the aerobic unit; and 6, feeding the outflow of the aerobic unit to the secondary sedimentation tank to perform sludge-water separation. The method can be operated in multiple modes of A-A2O, nitrogen removal AO, inverse AAO and the like and has high controllability, and a system has strong nitrogen removal capability. The method is suitable for upgrade and reform of newly built sewage treatment plants of towns lacking the land and the conventional sewage treatment plants.

The invention discloses a multi-point water inlet aeration anoxic-aerobic high-efficient nitrogen and phosphorus removal method. The method sequentially comprises the following steps of: (1) introducing sewage to be treated into a grille regulating tank through a water inlet pipe; (2) dividing the water after pretreatment by the grille regulating tank into two lines, wherein one line leads to an aeration tank and the other line leads to an anoxic tank; (3) sending the water in the anoxic tank into an aerobic tank; (4) dividing nitrified water after nitrification treatment in the aerobic tank into two lines, wherein one line returns to the anoxic tank, and the other line flows into a precipitation tank to perform mud-water separation; and (5) lifting sludge through a sludge lifting device, transporting the residual sludge to the outside through a sludge discharge pipe after passing through a sludge treatment system, and returning the sludge after lifting into the aeration tank. The method disclosed by the invention is suitable for new and transformation upgrading projects of high-ammonia nitrogen village and small town/industrial sewage treatment works, has the advantages of simplicity and convenience in management and maintenance, low cost, good treatment effects, strong nitrogen removal effect and the like, and is less affected by climatic conditions.

Provided are integrated domestic sewage treatment equipment and treatment method. The integrated domestic sewage treatment equipment is formed by the following treatment units: a gridding feces tank, an anaerobic tank, an aerobiotic tank and a precipitating and sterilization pond, all of which are sequentially communicated. The integrated domestic sewage treatment equipment is characterized in that water inlet and outlet pipes are arranged between the treatment units, each treatment unit is provided with a mud discharging pipe and an exhausting pipe, the anaerobic tank and the aerobiotic tank are each provided with an aerating system and a flow-back system, a triangular weir is adopted in water outflow of each treatment unit, the input end of the water inlet pipe of the gridding feces tank is located outside the equipment, and an inlet penetrates into the portion, before a grid, at the bottom of the gridding feces tank; the gridding feces tank is connected with the anaerobic tank, the water inlet pipe of the anaerobic tank is communicated with the interior of the bottom of the tank for water inflow, and a filling area of the anaerobic tank is filled with a fixed carrier and biological sponge iron filler; the anaerobic tank is connected with the aerobiotic tank, the water inlet pipe of the aerobiotic tank is communicated with the bottom of the tank for water inflow, and a filling area of the aerobiotic tank is filled with a fixed carrier and biological sponge iron filler; the aerobiotic tank is connected with the precipitating and sterilization pond, the water inlet pipe enters the middle of a precipitating pond body, and a 45-degree slope is arranged in a sludge area at the bottom of the pond; the precipitating pond body is connected with a sterilization pond body, the water inlet pipe enters the bottom of the sterilization pond body for chlorine tablet sterilization, and water is output out of the upper water outlet pipe.

The invention belongs to the technical field of biological engineering and environmental engineering and discloses a low-temperature aerobic denitrifying strain Pseudomonas psychrophila Den-03. The strain is suitable for growing in a neutral culture medium at the pH (potential of hydrogen) of 7.2 and at the temperature of 10 DEG C, and is characterized in that the strain is atrichous, aerobic and capable of achieving denitrification, has yellowish-white cells and can grow with nitrate nitrogen serving as energy, and both catalase and oxidase are positive. The strain obtained by screening solves the problems of low production efficiency, low denitrification efficiency in winter and the like during sewage treatment of northern cold cities, removal rate of TN (total nitrogen) in low-temperature domestic sewage reaches 74%, and on the premise of guaranteeing stable denitrification efficiency, denitrification rate of urban sewage treatment systems in winter is increased, production efficiency is improved, production energy consumption is reduced, and the stain is of great significance to realization of short-range synchronous nitrification and denitrification.

The present invention relates to a batch type constructed wetland sewerage treatment method and a system thereof, wherein the system comprises a cell body, a filling, a water intake pipe, a water output pipe and a ventilating pipe. The cell body is filled with matrix filling and is provided with a ventilating pipe, wherein plants are planted in the filling. Each performance period of the system comprises four steps of feeding water, reaction, discharging water and emptying, and the system runs in a manner of an ordinal batch type and a repetitive cycle period. The water intake pipe is switched in from the upper part, and the reaeration of the system bottom at reaction stage is intensified by the ventilating pipe, which improve the nitration efficiency. After the reaction finishes, discharging is carried out by the bottom water output pipe, and then the constructed wetland is at an emptying and idlesse step, wherein the reaeration of the constructed wetland system is completed, so as to improve the nitration efficiency of the system, the oxidative decomposition of sludge and the jam of the system. The present invention has the advantages of high efficiency, excellent denitrogenation effete, small occupation of land, little energy consumption, low cost, and is not easy to be jammed.

The invention discloses an urban sewage treatment composite material as well as a preparation method and application thereof. The urban sewage treatment composite material is prepared from rice hull, diatomite, polyaluminum chloride and ferment bacteria according to certain weight percentages. The preparation method comprises the following steps: A, uniformly mixing the rice hull and ferment bacteria, and naturally stacking and fermenting for two weeks to obtain a mixed raw material, wherein the fermentation temperature is 65-70 DEG C; B, when in use, uniformly mixing according to a condition that the weight ratio of the mixed raw material to water to brown sugar is equal to 1:0.3:0.01, fermenting for 110-130 minutes for later use, and ensuring that the water temperature of treated sewage is less than 10 DEG C; and C, uniformly mixing the mixed raw material which is fermented for later use with diatomite and polyaluminum chloride according to weight percentages to obtain the composite material. The invention also relates to an application of the composite material in urban sewage treatment. By virtue of the synergistic effects of adsorption, flocculation and biological transformation, the problems that an existing urban sewage treatment system cannot be used for effectively removing some hardly-degradable organic matters and soluble pollutants such as phosphorus and nitrogen can be solved, and thus a condition that effluent can reach the first grade A standard which is superior to the national urban and town sewage discharge standard can be ensured.

The invention discloses an anaerobic-aerobic composite bed biofilm reactor and a process thereof. The anaerobic-aerobic composite bed biofilm reactor comprises a reactor tank, the reactor tank is pre-buried in backfill soil, and the bottom of the reactor tank is provided with a fine sand basic layer and a concrete basic layer; the interior of the reactor tank is divided into an anoxic zone, an anaerobic zone, an aerobic zone, a sedimentation zone and a filtration disinfection zone, and an aeration system and an electronic control system are arranged for cooperation. Different proportions of MBBR biosuspension fillers are added in the anoxic zone, anaerobic zone and aerobic zone to increase the biomass and biological species in the reactor, thereby improving the treatment efficiency of thereactor. The reactor tank is designed to be buried in the ground, thereby solving the problem that the water quality is not up to standard due to low water temperature and low biochemical efficiency after high-concentration sewage such as sewage produced during slaughtering and breeding in northern winter are processed. The anaerobic-aerobic composite bed biofilm reactor has good denitrification capacity and organic matter removal effect, the interior of the reactor does not need to install a filler bracket, and the reactor is easy to maintain, and can save investment and land occupation.

The invention discloses an anti-clogging economic crop type filter bed-baffle subsurface flow constructed wetland enhanced nitrogen and phosphorus removal system which comprises a plant filter bed and a baffle subsurface flow constructed wetland as two main systems; the device intercepts a large amount of organic matters and suspended solids through plant roots in the filter bed, and plant residues are taken out from a water body when in harvest to prevent wetland clogging caused when sewage flows through the subsurface flow constructed wetland; meanwhile, the baffle subsurface flow constructed wetland extends the hydraulic retention time when the sewage flows through the wetland; the environment around the plant roots continuously shows aerobic, anoxic and anaerobic states, equivalent to a plurality of A2/O units connected in parallel or series; the nitrogen removal effect is significant; the phosphorus adsorbing effects of a ceramic substrate and a gravel substrate are also significant. In addition, the difference of plants in the nitrogen and phosphorus absorption effect is also comprehensively considered in the grading planting of vegetable type and food crop type plants to make up the deficiency that single plant absorbs nutrient salt; the entire ecosystem achieves the dual combination of environmental benefits and economic benefits of a constructed wetland.

The invention discloses a sequencing batch type combined biofilm integrated apparatus for treating high concentration organic wastewater, wherein a tank body is provided with two submerged biological film reaction zones, the center of the tank body is an anaerobic submerged biological film reaction zone, the periphery of the tank body is an aerobic submerged biological film reaction zone, the anaerobic submerged biological film reaction zone is closed, the two reaction zones are provided with half-soft fiber fillings internally and a a underwater propeller on the bottom, the packing of the anaerobic submerged biological film reaction zone is provided with a underwater aeration apparatus on the bottom.

The invention relates to a low-energy and intelligent three-dimensional ecological self-refluxing circulation nitrification method and apparatus. Wind driven generators are disposed aside of an anaerobic tank; and a solar power installation is disposed on a roof above the anaerobic tank. The tank is provided with at least one three-dimensional ecological self-refluxing circulation nitrification processing unit; each unit is divided into an ecological deodorization zone and a circulation nitrification reaction zone from top to bottom; each reaction zone is divided into an aerobic zone, a facultative zone, a sedimentation zone and an anaerobic zone from inside to outside, wherein the aerobic zones are provided with aeration components. The sewage flows through the anaerobic zone to the aerobic zone and enters the facultative zone for reaction and primary sedimentation after reacting in the aerobic zone through an aeration effect; partial of the sewage mixed liquid is aerated and enters the aerobic zone again; the other partial of the sewage self-refluxes to the anaerobic tank through a sludge diversion pipe; and a supernatant in the sedimentation zone finally flows out from a collecting pipe. The aeration power and gas-water density difference allows the sewage realizing self-refluxing circulation nitrification among every zone, so that pollutants can be effectively removed and the sewage can meet discharge indexes such as deodorization, nitrogen and phosphorus removal and total nitrogen in upgrading and reconstruction of municipal sewage plants.

The invention belongs to the field of flue gas denitration, and specifically provides a gamma-Fe2O3 nanoparticle modified nf-MnO2/ATP low-temperature denitration catalyst. Directed at the disadvantages of low carrier strength, poor SO2 resistance and complicated preparation method for a conventional flue gas denitration catalyst, the invention provides the gamma-Fe2O3 nanoparticle modified nf-MnO2/ATP low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: with attapulgite clay with large specific surface area and high adsorption performance as a carrier and a reducing agent, allowing the attapulgite clay to react with KMnO4 under a hydrothermal condition so as to prepare a nanoflower-like MnO2-coated attapulgite clay (nf-MnO2-ATP) catalyst, preparing high-performance gamma-Fe2O3 nanoparticles under a low-temperature hydrothermal condition at the same time, and subjecting nf-MnO2/ATP to surface modification with the high-performance gamma-Fe2O3 nanoparticles so as to prepare the gamma-Fe2O3/nf-MnO2-ATP denitration catalyst. Thus, N2 selectivity and SO2 resistance of nf-MnO2-ATP are improved. Meanwhile, the preparation method provided by the invention has mild preparation conditions and simple preparation process, and is a safe and highly-efficient preparation method for a low-temperature denitration catalyst.

The invention discloses a microbial agent for live pig breeding wastewater treatment as well as a preparation method and application of the microbial agent. The microbial agent comprises rice husks, biogas residues, calcium oxide and enzyme microorganisms in a certain ratio. The microbial agent comprises the following steps: (1) putting the biogas residues into a pressure cooker, and cooking; (2) uniformly mixing the rice husks and the enzyme microorganisms, and naturally heaping up for fermenting; (3) adding products obtained in the former steps into the calcium oxide, uniformly mixing and performing secondary fermentation to prepare the special microbial agent for the live pig breeding wastewater treatment. The microbial agent is applied to the live pig breeding wastewater treatment. The preparation method is feasible, and easy and convenient to operate; the rice husks after the secondary fermentation contain polysaccharide, crude fat, crude protein and other nutritional substances, can provide necessary nutritional components for microbes, have relatively strong synchronous decarbonizing and denitrogenating effects, and have strong anti-interference capability; according to the preparation method, the problems that in the prior art, certain organic matters, phosphorus, nitrogen and other soluble pollutants cannot be effectively removed and the like are solved, and the first-level B standard of the national urban sewage discharge standard is reached.

The invention provides a treatment method for wastewater with high ammonia nitrogen content. According to the invention, after copper ions in the wastewater with high ammonia nitrogen content are adsorbed, obtained wastewater is converged to enter an adjusting pool; the amount and quality of the wastewater are adjusted in the adjusting pool; adjusted wastewater in the adjusting pool is lifted to amembrane treatment system through a lift pump, and then quantitatively pumped to an anoxic pool through a metering pump; a denitrification site is provided; an aeration tray is arranged in the anoxicpool to avoid sludge from sedimentation; a mixed solution in the anoxic pool automatically flows into MBBR which provides a nitrification-denitrification site; effluent of the MBBR automatically flows into an FMBR membrane pool for solid-liquid separation of a large amount of suspended solids; nitrogen is removed through the following three ways in an FMBR treatment process: 1) nitrification-denitrification, 2) short-range nitrification-denitrification, and 3) anaerobic ammonia oxidation; sludge remaining in the FMBR membrane pool is discharged to a sludge pool; after sludge is treated through a submerged air blower pool, treated sludge is discharged to a comprehensive pool for further treatment; thus, the removal rate of ammonia nitrogen reaches 99% or above, and high treatment efficiency and good effluent water quality are achieved; equipment is compact and occupies small land area; and automatic control is easily realized, and operation management is simple.

The invention discloses a heterotrophic nitrification-aerobic denitrification pseudomonas. The strain is Pseudomonas sihuiensis YG5, and is preserved in the Guangdong Microbial Culture Collection Center, the preservation time is December 25, 2018, and the preservation number is GDMCC No: 60533. The strain can tolerate high concentrations of NH4<+>-N, NO3<->-N and NO3<->-N and has a high removal rate on NH4<+>-N, NO3<->-N and NO3<->-N in a high concentration range, which indicates that the strain YG5 has the potential of treating wastewater with high concentrations of NH4<+>-N, NO3<->-N and NO3<->-N.

The invention belongs to the field of flue gas denitrification, and particularly relates to an attapulgite-supported CoTiO3-CeO2-heterojunction SCR low-temperature denitrification catalyst and a preparation method thereof. By using non-metal clay minerals as a support, the supported active metals are cheap nontoxic high-activity CeO2 and CoTiO3; the two semiconductors form the heterojunction structure, and generate holes and electron pairs when being assisted by light, thereby enhancing the redox capacity, and effectively lowering the reaction temperature; and thus, the denitrification catalyst, which has the advantages of high denitrification properties, excellent SO2 resistance, mild reaction conditions, low energy consumption and low secondary pollution, is formed.

The invention discloses an aerobic denitrification strain and an application thereof. The aerobic denitrification strain is named as XPS-1 and collected in a China general microbiological culture collection center at NO. 3, yard 1, Beichen west road, Chaoyang district, Beijing, the collection date is September 29, 2017, and the collection number is CGMCC NO. 14772. The invention further provides an application of the aerobic denitrification strain to nitrogen removal for domestic sewage treatment. Efficient denitrification of the aerobic denitrification strain can be performed at a low carbon-nitrogen ratio and at the temperature of 25-30 DEG C, the aerobic denitrification strain is particularly applicable to nitrogen removal in the treatment process of urban domestic sewage with low carbon-nitrogen ratio and a certain salinity, the nitrogen removal rate can reach up to 100%, the nitrogen removal speed is high and effective, and the aerobic denitrification strain has a wide applicationprospect in the field of sewage treatment.

The invention provides a deep denitrification process for wastewater with a good total nitrogen removal effect for the situation that total nitrogen in effluent of an urban sewage treatment plant doesnot reach the standard easily. The process comprises the following steps that 1), denitrification adsorption treatment is performed on to-be-treated low-concentration total nitrogen wastewater through an ion exchange resin reactor; 2), resin adsorbed with nitrate nitrogen is soaked with a 10%-15% NaCl resin desorption solution for 2 hours to remove the nitrate nitrogen in the resin; 3), a desorption solution uses a denitrification biological filter to remove the nitrate nitrogen; 4), the resin in step 2) can be reused for the adsorption of the nitrate nitrogen in the wastewater after desorption. The process combines an ion exchange technology, a microbial enhancement technology and an anaerobic denitrification technology, uses the ion exchange resin to remove the total nitrogen, and thendilutes the desorption solution into the denitrification biological filter. A salt-tolerant anaerobic denitrifying biofilm is formed on a filler through pre-acclimation in a tank, so that the denitrification function of a biological nitrogen removal reactor is effectively improved, thereby achieving the purpose of removing the total nitrogen in the resin desorption liquid.

The invention relates to a low-energy and intelligent three-dimensional ecological external circulation nitrification method and apparatus for upgrading and reconstruction of a sewage treatment system. A contact oxidation tank for sewage treatment is provided with a solar power installation and wind driven generators so as to provide energy for operation of the sewage treatment system. The tank is provided with at least one three-dimensional ecological external circulation nitrification processing unit; each unit is divided into an ecological deodorization zone and a circulation nitrification reaction zone from top to bottom; each reaction zone is divided into a facultative sedimentation zone and a central sedimentation zone from inside to outside; and the contact oxidation tank is provided with aeration components to form an aerobic fluidized zone. A controller is introduced to control flow rate, dissolved oxygen, temperature and sludge concentration in the tank during sewage treatment, so that the sewage can flow circularly for a plurality of times between the aerobic zone and the facultative sedimentation zone to form a nitrification reaction circulation. A supernatant after reaction flows out from a collecting pipe. The sewage can realize the circulation nitrification by aeration power, so that pollutants can be effectively removed and the sewage can meet discharge indexes for upgrading and reconstruction of municipal sewage plants.

The present invention relates to a strain of alkalophilic and aerobic denitrifying bacteria and application thereof. The strain is named as pseudomonas HK13 and is preserved in China Center for Type Culture Collection, the preservation number is CCTCC NO:M2019611, the preservation date is August 7, 2019, the preservation address is Wuhan University, No.299, Bayi Road, Wuchang District, Wuhan City,Hubei Province, China. Under the optimal growth conditions, the strain KK13 has a total nitrogen removal rate of 92.62% in 12 h and an average nitrogen removal rate of 8.26 mg (L.h)<-1>, and denitrification speed is high and denitrification is effective. The adaptive PH range of the strain is6.5-10. In a strong alkali environment with pH being 10, the removal rate of total nitrogen oxide by the strain is more than 98% in 16h, and it is indicated that the strain has alkali resistance and can be used for treatment of nitrate-containing alkaline wastewater. The strain has high tolerance to bothnitrate nitrogen and nitrite nitrogen, is suitable for wastewater containing nitrate and nitrite with higher concentration, and is wide in application prospects in the field of sewage treatment.

The invention relates to a preparation method of a glass fiber filtering material with a V-Mo-Ti denitration system and belongs to the technical field of industrial denitration. The preparation method comprises the following steps: step 1, preparing impregnation emulsion; step 2, carrying out impregnation treatment on a filtering material; and step 3, carrying out high-temperature shaping treatment. With the adoption of the technical scheme, impregnation-hot shaping process treatment is carried out on the glass fiber filtering material so that a precursor in a denitration catalyst is thermally decomposed and formed catalyst powder is firmly combined with the glass fiber filtering material; and furthermore, a denitration structure of the V-Mo-Ti denitration system is formed on the surface of the filtering material and the treated glass fiber filtering material keeps relatively strong dustproof and PM2.5-prevention functions of the glass fiber filtering material and also has a good denitration capability at about 200 DEG C, and the beneficial effects are remarkable.

The invention relates to a low-energy and intelligent three-dimensional ecological internal circulation nitrification method and apparatus for upgrading and reconstruction of a sewage treatment system. A contact oxidation tank for sewage treatment is changed into a sedimentation tank. A solar power installation and wind driven generators are disposed for providing energy for system operation. The sedimentation tank is provided with at least one three-dimensional ecological internal circulation nitrification processing unit; each unit is divided into an ecological deodorization zone and a circulation nitrification reaction zone from top to bottom; each reaction zone is divided into an aerobic zone and a facultative sedimentation zone from inside to outside, and the aerobic zones are provided with aeration components. Flow rate, dissolved oxygen, temperature and sludge concentration in the tank during sewage treatment are controlled, so that the sewage can circularly flow for a plurality of times between the aerobic zone and the facultative sedimentation zone to form partial nitrification and denitrification for consuming endogenous carbon source. Finally, a supernatant flows out from a water outlet. The aeration power allows the sewage flowing circularly among every zone to realize circulating nitrification, so that pollutants can be effectively removed and the sewage can be discharged by meeting standard indexes such as deodorization, nitrogen and phosphorus removal and total nitrogen in upgrading and reconstruction of municipal sewage plants.

The invention discloses a comprehensive treatment method for tungsten smelting wastewater. The comprehensive treatment method comprises the following steps: 1) adding sulphuric acid in the wastewater generated by a tungsten smelting ion exchange method to adjust the pH value; 2) adding a treatment agent in the wastewater obtained in the first step, uniformly stirring, adequately reacting, standing and precipitating, filtering, taking a filter clear liquid, and detecting the contents of ammonia nitrogen, CODs and heavy metals in the wastewater. The comprehensive treatment method disclosed by the invention is capable of effectively treating the ammonia nitrogen in the tungsten smelting wastewater, playing a great treatment role on the heavy metals in the wastewater, and treating the CODs in the wastewater by properly increasing the pouring amount of a reagent A to really achieve the effect of achieving a plurality of purposes by one reagent; compared with the traditional tungsten industry wastewater treatment method, the prior-period equipment and facility investment and running cost consumption are greatly reduced, the tungsten industry wastewater treatment process flow is shortened, the wastewater treatment efficiency is increased, and the production cost is saved.