70results about How to "Increase denitrification rate" patented technology

The invention discloses a coupling filler autotrophic denitrification biofilter and application and belongs to the technical field of sewage treatment. Pyrrhotite, sulfur and a carbon source are utilized to be mixed and coupled according to certain proportion; then the materials are put into a reactor, and the autotrophic denitrification biofilter can be formed after inoculating biofilm formation;sewage flows through the biofilter, and nitrogen and phosphorus in the water are removed. The biofilter disclosed by the invention has the advantages of simpleness, easiness, practicability and shortbiofilm formation time; when the biofilter is utilized to treat nitrogen and phosphorus containing sewage, hydraulic retention time is only 0.5 to 3 h, and yielding water can meet a requirement; furthermore, the biofilter has the advantages of excellent nitrogen and phosphorus removal effect, low cost and suitability for engineering application.

The invention relates to the field of water treatment, and discloses a method and an apparatus for swirling flow strengthened biodegradation treatment of sewage. The method comprises: a, under an anoxic treatment condition, carrying out anoxic treatment on sewage and an active-sludge-containing material in an anoxic pool; b, carrying out aerobic treatment on the mixture obtained through the anoxictreatment in an aerobic pool to obtain a mixture A; and c, carrying out swirling flow breaking treatment on the part of the mixture A, returning the treated material to the anoxic pool, carrying outsolid-liquid separation on the remaining mixture A to separate the active sludge, sequentially carrying out swirling flow breaking treatment and hydrolysis acidification treatment on the at least partially separated active sewage, and returning the supernatant obtained through the hydrolysis acidification treatment to the anoxic pool. According to the present invention, with the method, the totalnitrogen removal effect in the biochemical process can be effectively improved, and the resource utilization of the sludge can be improved.

The invention discloses a simultaneous phosphorus and nitrogen removal light material, a preparation method and the application thereof, and belongs to the technical field of environment function materials and sewage disposal. A fusion mixture is obtained by sufficiently fusing and dispersing sulfur and an iron-based component, wherein the iron-based component is a pyrite and calcium magnesium carbonate mixture; and foaming treatment is carried out on the fusion mixture to form the simultaneous phosphorus and nitrogen removal light material. The simultaneous phosphorus and nitrogen removal light material disclosed by the invention has the characteristics of high porosity, large specific surface area, light weight and high reaction activity. The obtained light material, as a microbial carrier and an electron donor of biochemical reactions, is applied to the reactors, such as fixed beds and fluidized beds, for sewage disposal, and has the advantages of good microorganism adhesion property, high denitrification speed and good phosphorous removal effect.

The invention discloses a two-section type reinforced denitrification multistage soil percolation system, comprising a front-section system and a rear-section system. The front-section system is an aerating aerobic open tank body and comprises a water inlet tank, an intake water distributor, a percolation layer, a hybrid module layer, a bottom cushion layer, a bottom drainpipe and an aeration system; the rear-section system is a non-aerating anoxic enclosed tank body and comprises an intake water distributor, a percolation layer, a hybrid module layer with novel solid-phase carbon source, a bottom cushion layer and a bottom drainpipe; the front-section system and the rear-section system are connected via a connecting pipe; and the vertical height of the two tank bodies is 20 to 50 cm. The two-section type reinforced denitrification multistage soil percolation system enables nitrification and denitrification to be independently carried out in different environments, so denitrification effect can be reinforced; since a degradable polymer is used as the novel solid-phase carbon source, the system has the substantial advantages of a high denitrification rate, no chroma influence on effluent and the like; and the system is low in infrastructure cost, stable in operation effect and convenient to maintain.

Discloses a combined type biochar enhanced nitrogen removal filler and a preparation method thereof. The filler comprises modified rice hulls which are filled inside mesh suspended balls and filling rate is 60%. A modified method includes that the rice hulls are thrown into water in proportion of 1g/L : 100g/L, H2O2 is added to enable the water with the rice hulls to be in thickness of 15g/L to 20g/L, and HC1 or H2SO4 is used for adjusting potential of hydrogen (PH) value to 2-3. Besides, FESO4 is added to enable a solution to be in the thickness of 2g/L to 3g/L and then the solution is continuously stirred and reacts for 1.5-2 hours, and the rice hulls are fetched out to be cleaned and dried, and therefore the oxygenated rice hulls can be achieved. Next, in solid and liquid quality volume proportion of 1g/L : 100g/L, the rice hulls after being oxidized are throw into microelement mixed liquor to be soaked for 24 hours and then the solution is continuously stirred so as to enable the surfaces of the rice hulls to be absorbed with microelement. The mixed liquor comprises 1 mol/L FeSO4, 1 mol/L ZnSO4, 1 mol/L CuSO4Na2MoO4, and 1 mol/L MnSO4, and the rice hulls are fetched out to be dried so as to obtain the modified rice hulls.

The invention belongs to the technical field of biological treatment of wastewater, and relates to a method for efficiently denitriding aerobic granular sludge by combining stepwise water feeding with alternate anaerobic and aerobic treatment. In the method for efficiently denitriding aerobic granular sludge, the reaction process is designed into multiple stages on the basis of a sequencing batch reactor, and an anaerobic-aerobic or low-oxygen alternate running mode is adopted at every stage; a water feeding mode for feeding water according to different proportions at multiple sections is designed according to the quality of fed water, and a water feeding point is set at the early anaerobic stage or the entire anaerobic stage of every stage in the reaction process. The method for efficiently denitriding aerobic granular sludge disclosed by the invention has the advantages of high denitriding efficiency, stable granular sludge performance and no need of adding any running cost, and is widely applied in the field of wastewater treatment.

The invention relates to a permeable reaction material for nitrate pollution of underground water. The permeable reaction medium material consists of quartz sand, denitrifying bacteria, chitosan, CaCl2, sodium alginate, coated nano iron and a Na2HPO4-NaH2PO4 buffering solution with the pH value of 7 at a mass ratio of (1-3):(0.1-0.5):(1-3):(1.5-3):(0.5-1):(0.5-1.5):50. The invention also discloses a method for preparing the permeable reaction material. By adopting the permeable reaction medium material, not only can the carbon source be released for the growth of microorganisms, but also the reducing environment of the underground water can be enhanced, the denitrifying rate is increased, the water quality is purified, and the secondary pollution problem of the nitrate reduction product can be effectively avoided.

The invention relates to an energy-saving enhanced nitrogen removal process, sewage sequentially passes through an anaerobic zone, a multi-stage aerobic-anoxic zone and a last-stage aerobic zone to complete the biological treatment process, and mud-water separation is completed in a secondary sedimentation tank. The multi-stage aerobic-anoxic zone comprises at least two stages, and each stage comprises an aerobic section and an anoxic section which are sequentially arranged. Outlet water after passing the anaerobic zone for anaerobic fermentation, one part directly enters into the first-stage aerobic section in the multi-stage aerobic-anoxic zone, and the other part respectively enters into the front ends of all stages of the anoxic sections in the multi-stage aerobic-anoxic zone by diversion through an open channel. The outlet water from the multi-stage aerobic-anoxic zone completely passes through the last-stage aerobic zone and enters into the secondary sedimentation tank for sedimentation, clear solution is discharged, one part of sediment is discharge, and the other part flows back into the anaerobic zone. The energy-saving enhanced nitrogen removal process has the characteristics of leading the denitrification reaction rate to be fast, shortening the reaction time, saving equipment required in the process and saving energy.

The invention belongs to the technical fields of microbial fuel cells and water treatment, and provides a biological cathode electrochemical system for processing low C/N (carbon/nitrogen) ratio wastewater, and a method for processing waste water thereof in order to solve the problem that a cathode nitrate nitrogen removal rate is low and output voltage is low when the biological cathode of the traditional microbial fuel cell is at a low C/N ratio. The electrodes of a cathode chamber and an anode chamber are carbon brushes; escherichia coli is inoculated in the anode chamber; Acinetobacter sp.Y1 is inoculated in the cathode chamber; the cathode chamber and the anode chamber are respectively provided with a saturated calomel reference electrode; an anode conduction electrode and a cathodeconduction electrode are connected through an external resistor to form an integral circuit; the external resistor is connected with a voltage data collector in parallel. According to a reactor anodeconstructed by the invention, organic matters are consumed, decarburization is carried out for providing electrons, meanwhile, amine salt generates nitratlon reaction, and the cathode generates denitrification reaction. An experiment proves that the biological cathode BES (Bioelectrochemical system) can realize the effects of synchronous nitrification and denitrification as well as decarburizationand electricity generation.

A method for realization of nitrite accumulation during a nitrate reduction process, and belongs to the technical field of water treatment. The method is realized by the following steps: first, selecting a sludge type and concentration, setting the reactor sludge concentration to 1000 - 1500mg / L; selecting a carbon source and setting a carbon nitrogen ratio, when C / N reaches 2.5:1, instantly pouring raw water with the C / N being 2.5:1 into a reactor preloaded with sludge for sludge and water stirring and mixing, pouring water in again with helping of pH indication, after the last cycle is over and the water volume in the reactor reaches the upper limit of the reactor volume or an inflection point of a PH curve appears, when the PH value is greater than 9.5, stopping the reaction, precipitating for 10-15 min, separating the sludge and water, and draining away water after the precipitation is completed. The method is high in denitrification rate, simple to maintain, low in cost, and free of the need of professional operations.

The invention discloses water treatment filler capable of removing ammonia nitrogen and total nitrogen in wastewater synchronously. The filler is of a cylindrical embedding-sleeving structure as a whole and is divided into an outer sleeving layer and an inner embedding layer. The outer sleeving layer is formed by foaming and blending outer sleeving layer materials, and the outer sleeving layer materials comprise low-density polyethylene (LDPE), basalt fiber and nano calcium carbonate powder. The inner embedding layer is blended by inner embedding layer materials, and the inner embedding layermaterials comprise polybuthylenesuccinate (PBS) and modified bamboo powder. By the adoption of the embedding-sleeving structure, the outer sleeving layer is provided with a pore structure which can allow microorganisms to gather together and a trichoid structure which extends outwards, under the aerobiotic and high-hydraulic-shearing condition, a surface turbulence environment is formed, and the inner embedding layer is in an alternating oxygen-enriched-microaerobic-anaerobic environment. The water treatment filler can synchronously remove ammonia nitrogen and total nitrogen, the running costof the filler is low, the volume load of unit nitrogen of wastewater treatment facilities can be increased in situ, and the selection contradiction of technological parameters of synchronously removing nitrogen and phosphorous in the running process of an actual technology can be effectively avoided.

The invention discloses a device and a method for purifying fish tank water. The device comprises a reactor shell, a physical filter chamber, a biochemical filter chamber and a sterilization and disinfection chamber. The reactor shell is provided with a water inlet and a water outlet, the physical filter chamber, the biochemical filter chamber and the sterilization and disinfection chamber are sequentially arranged in the reactor shell along a water flow direction, a filter cotton interception area is arranged in the physical filter chamber, a nitration area, an activated carbon area and a denitrification area are sequentially arranged in the biochemical filter chamber along the water flow direction, the nitration area is filled with fillers carrying nitrifying bacteria, the denitrification area is filled with fillers carrying denitrifying bacteria, and ultraviolet lamp tubes are arranged in the sterilization and disinfection chamber. The device and the method are used for purifying the fish tank water in a circulating manner and provide the most comfortable environment for fish school production.

The invention discloses a method for increasing denitrification rate in wastewater treatment through goethite. The method is characterized in that nanometer goethite is fed in a certain ratio according to carbon-nitrogen ratio into an anaerobic tank of a sewage treatment plant to be uniformly mixed; or granular goethite can fill as fillers a reaction column, a film is covered, sewage is poured into the reaction column from bottom to top after startup, and the hydraulic retention time is controlled to be 0.5 to 12h so that the sewage can be fully in contact with goethite; goethite promotes the microorganism to reduce nitrate in sewage into NO or N2O or N2 through organic matters in the sewage, so as to achieve the denitrification effect. With the adoption of the method, the denitrification rate can be increased, and the damage of accumulated nitrite to microorganism can be avoided; in addition, the quantity of fed external carbon sources can be decreased while the denitrification rate is increased, and thus the cost is effectively reduced.

The invention provides a treatment method of domestic sewage. The treatment method comprises the following steps: firstly, carrying out primary treatment on the domestic sewage through a grid and sediment to remove large-particle solid matters in the domestic sewage; conveying the domestic sewage subjected to the primary treatment into a membrane bioreactor and carrying out anaerobic-aerobic circulating treatment; in an aerobic treatment process, oxidizing nitrogen in the sewage into nitrite and nitrate through microorganisms; under an anaerobic condition, reducing the nitrate through denitrifying bacteria in the microorganisms, so as to realize molecular nitrogen or nitrous oxide. According to the treatment method, a hollow fiber membrane containing quinonyl is filled into the membrane bioreactor; in a microorganism denitrification process, the quinonyl can be used as an electron transfer vector to participate in a denitrification process and participate in and promote a reduction process of the nitrate (nitrite), and the denitrification speed is improved under an anaerobic condition, so that the efficient denitrification aim is realized.

The invention discloses a synthetic method of a nanofiber membrane-shaped efficient water body solid-phase denitrification carbon source. The synthetic method comprises the following steps of S1, mixing degradable synthetic polymers according to a ratio of 1: (1-10) to form a solid-phase mixture; S2, mixing DMF (dimethylformamide) and trichloromethane according to a ratio of 1: (1-10) to form a liquid-phase mixture; S3, dissolving the solid-phase mixture into the liquid-phase mixture at the temperature of 40-60 DEG C to obtain a polymer solution with the content of PHB (polyhydroxybutyrate)/PHBV (polyhydroxyvalerate)/PLA (polylactic acid) being 4-12wt%; S4, performing electrostatic spinning on the polymer solution to obtain an electrospun nanofiber membrane; and S5, putting the electrospunnanofiber membrane into a vacuum drying oven at 60 DEG C for 2 to 24h, cleaning the electrospun nanofiber membrane with deionized water, and drying the cleaned electrospun nanofiber membrane in a drying oven at 80-120 DEG C to obtain the nanofiber membrane-shaped efficient solid-phase denitrification carbon source for the water body, so that denitrification nitrogen removal can be performed on low-concentration, large-water-volume and eutrophicated natural water body, and the removal rate of nitrate nitrogen can reach 99%.

The invention discloses a polyethylene glycol-containing composite carbon source for biological denitrification of sewage. The composite carbon source comprises, by mass, 10-15% of polyethylene glycol, 10-15% of polyol, 10-20% of glucose, 20-25% of molasses, 5-10% of sodium acetate, 1-3% of calcium acetate, 0.2-0.5% of bactericide, 0.1-0.2% of defoaming agent, and the balance of water, and the sum of the components is 100%. The invention also relates to a preparation method of the polyethylene glycol-containing composite carbon source for biological denitrification of sewage.The composite carbon source can meet the nutrition required by microorganisms in different growth stages in microbiota, and high-efficiency denitrification of wastewater is realized, so that the problems of insufficient carbon source in low-temperature seasons and high nitrogen removal efficiency in the prior art are solved. The technical problems that the price of a carbon source is high, and long-term addition of a single carbon source affects bacterial microorganisms in a denitrification section and structural diversity of denitrifying bacterial communities. The composite carbon source is free of harmful substances, low in price and capable of overcoming the defects of existing carbon sources.

The invention discloses a method and system device for removing nitrate in water based on S-Fe collaborative autotrophic denitrification. The method comprises the steps of treating wastewater containing sulfate in an anoxic or anaerobic reactor by virtue of sulfur particles, iron particles and denitrifying bacteria, and separating water by virtue of a membrane module. The invention further provides the system device for implementing the method. According to the system device, the autotrophic denitrification of S and the autotrophic denitrification of Fe are collaborated in the reactor, denitrification and separation processes are combined together, activated sludge, S and Fe are fluidized through stirring, and efficient autotrophic denitrification is adequately carried out. According to the method, the autotrophic denitrification of S and the autotrophic denitrification of Fe are collaboratively coupled, and the control of the generation amount of sulfate radicals and the maintenance of the pH value of a reaction system are simultaneously realized. The method is suitable for treating medium-concentration and high-concentration nitrate wastewater, has the advantages of high nitrate removal rate, simplicity in operation, small occupied area, low operation cost and the like and will play an important role in treatment practice of nitrate wastewater.

The invention provides a treatment method of livestock and poultry wastewater. The treatment method comprises the following steps: carrying out primary treatment on the livestock and poultry wastewater through a wetland, wherein aquatic plants are planted in the wetland; conveying the wastewater subjected to the primary treatment into a membrane bioreactor and carrying out anaerobic-aerobic circulating treatment, wherein the membrane bioreactor is internally filled with a hollow fiber membrane containing quinonyl. According to the treatment method of the livestock and poultry wastewater, provided by the invention, firstly, the wetland is used for carrying out the primary treatment on the livestock and poultry wastewater, and organic pollutants, nitrogen, phosphorus and the like in the livestock and poultry wastewater are removed primarily; then the membrane bioreactor is used for carrying out the anaerobic-aerobic circulating treatment on the wastewater subjected to the primary treatment; the membrane bioreactor is internally filled with the hollow fiber membrane containing the quinonyl, the quinonyl in the fiber membrane can be used for accelerating a reduction process of the nitrogen and a denitrification speed under an anaerobic condition is improved, so that the efficient denitrification aim is realized, and the aim of finishing COD (Chemical Oxygen Demand) removal and denitrification at the same time is realized.

The invention discloses short-range nitrification-denitrification municipal wastewater treatment system and method. The short-range nitrification-denitrification municipal wastewater treatment systemcomprises a water storage pond, a primary settling tank, a facultative tank, an aerobic tank and a secondary settling tank communicating sequentially, wherein a grid is arranged between the water storage pond and the primary settling tank; municipal wastewater from the water storage pond passes through the grid, so that suspended solids are preliminarily removed; a feeding port is formed between the primary settling tank and the facultative tank; a sewage reflow system is arranged between the aerobic tank and the facultative tank; a part of sewage in the aerobic tank reflows to the facultativetank through the sewage reflow system; a sludge reflow system is arranged between the secondary settling tank and the facultative tank; a part of sludge reflows to the facultative tank; excess sludgeis discharged through a sludge discharge system. According to the short-range nitrification-denitrification municipal wastewater treatment system and the method provided by the invention, through controlling the process conditions, a nitrification tank-aerobic tank is simplified to be a short-range nitrification tank, so that the required kinetic energy is greatly reduced; therefore, compared with a common municipal wastewater treatment process, according to the process, the capital construction cost is remarkably reduced, the treatment capacity is high, the effect is good, and the process ishigh-efficiency and stable.

A method of enriching short-cut denitrifying bacteria by substrate feeding and intermittent operation belongs to the technical field of water treatment. Activated sludge containing short-cut denitrifying bacteria is used as inoculating sludge; a bacterial fermenting tank is utilized to allow enrichment culture of short-cut denitrifying bacterial colonies within a short term by means of substrate (nitrites and organics) feeding and intermittent operation. The short-cut denitrifying bacterial colonies attained herein are of numerical dominance in total bacteria, high nitrite-denitrifying rate can be achieved, and the capacity to carry out denitrifying by using nitrates as electron receptors is imparted.

The invention discloses a solid carbon source suitable for a high-concentration nitrate nitrogen sewage treatment. The solid carbon source comprises PBS, biologically fermented bamboo powder, starch,water and a silane coupling agent according to a ratio of (25-65): (30-50): (6-30): (1-4): (1-6). The preparation method comprises the following steps: step one, uniformly mixing PBS, biologically fermented bamboo powder, starch, water and a silane coupling agent in a high-speed mixer according to the set ratio; step two, adding the uniformly mixed materials into a twin-screw extruder, adjusting the temperature to 110-130 DEG C, carrying out internal mixing, melting, blending and uniformly stirring; and step three, extruding the blend by a twin-screw extruder, cooling the extrudate by water, crushing the extrudate, granulating the powder, and drying. The production cost of the solid carbon source is reduced, meanwhile, the biomass utilization rate is improved, and the waste of resources ismaximally reduced.

The invention discloses a method for treating a polluted water body by a synchronous nitrification and denitrification biological carrier coupling system. A construction method of the synchronous nitrification and denitrification biological carrier coupling system comprises the following steps: 1) preparing a degradable cellulose carrier and biochar; 2) constructing a biological membrane device; 3) arranging the degradable cellulose carrier, the biochar and a conventional carrier in the biological membrane device, and adding functional bacteria to form the synchronous nitrification and denitrification biological carrier coupling system. The synchronous nitrification and denitrification biological carrier coupling system can quickly enrich functional microorganisms in a water body which is mainly polluted by ammonia nitrogen and nitrate nitrogen by utilizing the strong adsorption performance of a degradable cellulose carrier slow-release carbon source and biological carbon, so that an efficient denitrification effect is achieved.

The invention discloses a preparation method of a denitrification carbon source for sewage treatment. The preparation method comprises the following steps: dissolving polyamino acid or a sodium salt thereof and inorganic base in glycerol, immersing starch in the obtained solution, and conducting reacting according to a weight ratio of the starch to the polyamino acid or the sodium salt thereof tothe inorganic base to the glycerol of 1: (4-8): (0.5-10): (20-40) at a reaction temperature of 100-120 DEG C for 10-20 h; adding polyvinyl alcohol and an emulsifier after the reaction is finished, conducting mixing according to a mass ratio of (2-4): (1-2): (0.5-1), performing reacting at 60-80 DEG C for 1-2 h, carrying out cooling to room temperature, adding a coagulant aid, trace elements and vitamins, performing uniform stirring, and conducting drying to obtain the denitrification carbon source. The denitrification carbon source prepared by using the method disclosed by the invention is high in denitrification total nitrogen removal rate and small in dosage, and compared with a pure carbon source, denitrification total nitrogen removal efficiency and capacity present obvious technical advantages in short-term and long-term processes.