42 results about "Enhanced biological phosphorus removal" patented technology

The invention discloses a device and a method capable of realizing simultaneous phosphorus and nitrogen removal from sewage in a low C/N ratio by coupling enhanced biological phosphorus removal with simultaneous shortcut nitrification and denitrification and belongs to the field of biological sewage treatment. After entering an SBR coupling enhanced biological phosphorus removal with simultaneous shortcut nitrification and denitrification, sewage is first subjected to anaerobic stirring, and GAOs (glycogen-accumulating organisms) and PAOs (phosphorus-accumulating organisms) absorb organic carbon sources from the sewage and synthesize an internal carbon source PHA (polyhydroxyalkanoates) to be stored in bodies; then the sewage is subjected to low-oxygen aeration stirring, AOB (ammonia oxidizing bacteria) play a role in shortcut nitrification to convert ammonia nitrogen into nitrite nitrogen, and the PAOs decompose the PHA for aerobic phosphorus accumulation so as to create a hypoxic microenvironment beneficial to that the GAOs and the PAOs use the nitrite nitrogen produced during shortcut nitrification for endogenous denitrification and denitrifying phosphorus removal respectively. The method coupling enhanced biological phosphorus removal with simultaneous shortcut nitrification and endogenous denitrification is capable of realizing simultaneous phosphorus and nitrogen removal from the sewage in the low C/N ratio without addition of a carbon source, so that oxygen consumption and energy consumption are reduced and urban sewage treatment costs are saved.

The invention discloses a device and method for realizing high-efficiency and low-consumption nitrogen and phosphorous removal of municipal sewage and belongs to the field of biological treatment of sewage and sludge. Sewage in a raw water tank sequentially enters an anaerobic zone and an aerobic zone of a reactor for enhanced biological phosphorus removal and whole-process nitrification through awater feeding pump; anaerobic phosphorus release is performed in the anaerobic zone; whole-process nitrification and aerobic phosphorus absorption effects are carried out in the aerobic zone; subsequently, the sewage is drained into a settling pond, supernate enters a reactor for fermentation coupling, short-cut denitrification and synchronous anaerobic ammonium oxidation of excess sludge. The excess sludge is quantitatively fed into the reactor for fermentation coupling, short-cut denitrification and synchronous anaerobic ammonium oxidation of the excess sludge each day; short-cut denitrifying bacteria transform nitric nitrogen into nitrite nitrogen by using organic matters produced by hydrolysis and fermentation of the sludge; anaerobic ammonium oxidizing bacteria transform excess ammonia nitrogen and nitric nitrogen into nitrogen. According to the device and the method disclosed by the invention, deep nitrogen and phosphorus removal of the municipal sewage is realized by using an enhanced biological phosphorus removal process, a short-cut denitrification process and an anaerobic ammonium oxidation process; moreover, sludge reduction is realized by the hydrolysis and fermentation effects of the sludge, so that energy conservation and consumption reduction are realized.

The invention discloses a microlunatus phosphovorus engineering strain capable of efficiently accumulating polyphosphate. The microlunatus phosphovorus engineering strain is microlunatus phosphovorus JN459-M571 and is preserved in the China General Microbiological Culture Collection Center with the preservation number of CGMCC No. 11770 on December 1, 2015. A continuous error-prone PCR method is adopted to mutate a promoter of a ppk2 gene in vitro, JN459 is used as a starting strain and a strain library containing the mutant of the promoter of the ppk2 gene is established through a gene recombination technology, and the JN459-M571 strain, of which, the capacity of decomposing polyphosphate under anaerobic conditions is reduced and the capacity of synthesizing polyphosphate under aerobic conditions has no significant difference, is obtained through screening. The Poly-P (polyphosphate) content of the strain disclosed by the invention is 2.4 times higher than that of an original strain JN459 in an anaerobic operation process and the strain disclosed by the invention can be applied to an EBPR (Enhanced biological phosphorus removal) process in a sewage treatment plant.

The invention provides a culture medium for screening an enhanced biological phosphorus removal functional bacterium and a method for screening the enhanced biological phosphorus removal functional bacterium, and relates to a culture medium for screening a phosphorus removal functional bacterium and a method for screening the phosphorus removal functional bacterium. The culture medium and the method solve the problems that the prior method for screening the enhanced biological phosphorus removal functional bacterium has poor direction, the obtained enhanced biological phosphorus removal functional bacterium has small amount of strains, and the culture medium is not suitable for growth of the enhanced biological phosphorus removal functional bacterium. The culture medium for screening can be an anaerobic culture medium, an aerobic culture medium, a solid separation culture medium and a liquid separation culture medium. The method comprises the following steps: 1, preparing the culture mediums; 2, collecting mud; 3, culturing the anaerobic culture medium; 4, culturing the aerobic culture medium; 6, culturing the anaerobic culture medium; 7, circulating step 4 to step 6 for 2 to 4 times; 8, diluting in constant gradient; 9, culturing the solid separation culture medium; 10, culturing the liquid separation culture medium; 11, repeating step 8 to step 10 for 3 to 8 times; and 12, detecting. The method has strong direction, the functional bacterium obtained by screening has large amount, and the culture medium is suitable for growth of the functional bacterium.

The invention belongs to the technical field of biological sewage treatment, and particularly relates to a side-flow enhanced biological phosphorus removal process which comprises the following steps:1, introducing wastewater into a primary sedimentation tank for sedimentation, introducing separated sewage into an anoxic tank, and introducing separated sludge into a primary sedimentation sludge fermentation tank; 2, introducing the sewage in the anoxic tank into an aerobic tank, refluxing part of nitrification liquid mud water discharged from the aerobic tank to the anoxic tank, and introducing the other part of nitrification liquid mud water into a secondary sedimentation tank; 3, after sludge-water separation is conducted on nitrification liquid sludge-water in the secondary sedimentation tank, discharging the supernatant outwards, discharging part of sludge outwards, and enabling the other part of sludge to flow back to the bypass flow pre-anoxic tank; and 4, adding a primary sludge fermentation supernatant into the bypass flow pre-anoxic tank, carrying out a mixing reaction, allowing the obtained reaction product to enter a bypass flow anaerobic tank, and discharging sludge after being fermented in the bypass flow anaerobic tank to enter a main flow anoxic tank. The process gets rid of or reduces dependence on a water inlet carbon source to a certain extent, and the phosphorus removal effect and stability of the process are improved.

Sewage treatment is performed by using sulphur to facilitate electron flow. A first cycle uses a sulphur composition having sulphur and/or sulphur compounds to transfer electrons from organic carbon to oxygen, nitrate and nitrite, and to convert phosphorus-containing compounds to solid material, which is retained in sewage sludge. The sulphur is further used to perform denitrification of nitrogen compounds. A further cycle uses oxygen to oxidize any ammonia present to nitrate and/or nitrite.

The invention belongs to the field of sewage treatment, discloses a method for establishing an enhanced biological phosphorus removal system, and aims to improve the phosphorus removal rate of sewagetreatment, reduce the treatment cost and reduce secondary pollution. The method comprises five parts, which are an experiment device SBR reactor, sludge inoculation, an SBR reactor operation period, SBR reactor operation parameters and an artificial sewage formula. After 45 days of domestication, the TP removal rate of the enhanced biological phosphorus removal system reaches 97.5%, the COD removal rate reaches 91.2%, and the NH3-N removal rate reaches 38.8%. The method is a biological phosphorus removal method, a very high phosphorus removal effect is achieved, and high cost and secondary pollution caused by a chemical phosphorus removal method are avoided. The concentrations of initial reaction TP, COD and NH3-N of the enhanced biological phosphorus removal system established by the disclosed method are close to actual concentrations of inlet water of a sewage treatment plant, and a reference can be provided for technical transformation for improving the TP removal rate of the sewagetreatment plant.

The invention relates to an integrated synchronized autotrophic nitrogen removal and enhanced biological phosphorus removal system and method, which belong to the field of biological treatment of sewage. The integrated synchronized autotrophic nitrogen removal and enhanced biological phosphorus removal system mainly involves three types of bacteria: nitrite bacteria, phosphorus-accumulating bacteria and anaerobic ammonium oxidation bacteria attached to sponge filler. Urban domestic sewage gets into an integrated EBPR+PN/A-SBR reactor via a water inlet tank, and in an anaerobic zone, phosphorus is released by the phosphorus-accumulating bacteria and an internal carbon source is stored; after phosphorus release is complete, aeration is started, partial short-cut nitrification and aerobic phosphorus uptake reaction are carried out, and meanwhile, partial synchronous anaerobic ammonia oxidation takes place; and in an anoxic zone, the anaerobic ammonium oxidation bacteria utilize remaining ammonia nitrogen and nitrite nitrogen produced by short-cut nitrification to carry out anaerobic ammonium oxidation reaction. The carbon source of raw water is sufficiently utilized, a sponge filler biomembrane is suitable for the growth of the anaerobic ammonium oxidation bacteria with a long sludge age, the contradiction with the sludge age of the phosphorus-accumulating bacteria is overcome, the energy consumption of aeration is reduced, and moreover, the objective of low-carbon-to-nitrogen ratio deep urban domestic sewage nitrogen and phosphorus deep removal can be achieved.

The invention provides a method for rapidly screening phosphorus-accumulating bacteria in active sludge, belonging to the technical field of sewage treatment and phosphorus removal. The invention relates to a method for rapidly screening high-efficiency phosphorus-accumulating bacteria in a reinforced biological phosphorus removal system. According to the invention, a reinforced biological phosphorus removal technology is an important phosphorus removal technology in sewage treatment, the phosphorus-accumulating bacteria takes a main removal effect in the technology; and the current strain isolation method has the defects that effect is poor and effective strain number is less. In the invention, a photocopy method coordinated with different culture media is utilized, so that bacterial colony passage is performed in the culture conditions alternating between anaerobism and aerobism; and in the passage process, dyeing with Sudan black and toluidine blue is carried out for observation, white-blue plaque selection is carried out for selecting blue plaque strains to be used as high-efficiency phosphorus removal strains. By using the method, the problems of fussy process, slow screeningand poor pertinence caused by a culture medium and culture conditions are solved, and the high-efficiency phosphorus-accumulating bacteria can be rapidly screened out from the active sludge.

The invention discloses a biological phosphorus removal system construction method based on particle and floc coexistence, relates to the biological phosphorus removal system construction method, and aims at solving the technical problems that flocculent activated sludge is not prone to sedimentation, the stability of granule sludge is poor, and requirements for culture conditions of the granule sludge are severe. The method comprises the steps that sludge is inoculated into a secondary sedimentation tank, artificial waste water which takes sodium propionate as a carbon source is added into the secondary sedimentation tank, anaerobic agitation is conducted, aerobic reaction is conducted, sedimentation is conducted, and drainage is conducted. By means of he biological phosphorus removal particles and floc sludge system cultivated through the method, the dynamic stability of particles and flocs can be kept in six-month running time, and good phosphorus removal capability and sludge sedimentation performance are achieved. By means of the biological phosphorus removal system construction method based on the particle and floc coexistence, after the system is run for fifty days, the ratio of particles to total sludge quantity ranges from 47% to 67%, the sludge sedimentation index ranges from 35 mL/g to 56 mL/g, the removal rate of COD is over 90%, and the removal rate of PO4<3->-P is over 95%. The invention belongs to the technical field of biological treatment of waste water.

The invention discloses an accelerator for enhanced biological removal of ammonia nitrogen in high ammonia nitrogen industrial wastewater and application thereof. The accelerator is a mixture comprising the raw materials in parts by weight: 100 parts of methanoic acid, 10-60 parts of glucose and 0.5-8 parts of salts. The accelerator provided by the invention can be directly added into wastewater and used for effectively accelerating the growth of nitrifying bacteria in a nitrifying tank to ensure that the nitrifying bacteria form dominant bacteria within short time, so that the problem that the nitrifying process is difficult to accelerate and control when the ammonia nitrogen wastewater is treated by using a biological method is solved.

The invention relates to a synchronous high-efficiency biological phosphorus removing and reclaiming method based on an activated sludge process. The system comprises an aeration tank and a sedimentation tank, which are communicated with an intake pipeline, wherein an aeration device is arranged in the aeration tank; the aeration tank is communicated with the sedimentation tank through the sewage pipeline; an effluent drainage pipeline for discharging supernate is arranged on the sedimentation tank. The system is characterized in that an unused reflux sludge storage drum, a sewage-sludge mixing drum, a primary sedimentation device, a phosphorus reclaiming reaction drum and a secondary sedimentation device are sequentially communicated with the bottom of the sedimentation tank. Compared with the prior art, the treatment system and method provided by the invention aim to overcome the defect of an existing activated sludge biological phosphorus removal system, are used for reclaiming phosphorus while an activated sludge system synchronously removes phosphorus with high efficiency on the basis of single-stage aerobic biological phosphorus removal, and are capable of effectively enriching phosphorus accumulation microorganisms. Working in a continuous flow mode, the system is small in investment, stable in effluent quality and high in phosphorus reclaiming quantity, can be used for lowering the effluent phosphorus concentration of an existing activated sludge system effectively and reclaiming precious phosphorus resources, and is suitable for transformation of a traditional activated sludge process.

The invention discloses a domestic sewage treatment process capable of improving phosphorus removal quality. The method comprises the steps of pre-precipitation, synchronous precipitation and post-precipitation; wherein a primary sedimentation tank is arranged in the front sedimentation tank; an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank are arranged in thesynchronous sedimentation tank; a flocculation tank and a contact filtering tank are arranged in the rear sediment. In the domestic sewage treatment process capable of improving phosphorus removal quality, by means of the pre-precipitation process, the total amount of phosphorus in the P-containing raw water is reduced; synchronous precipitation, nitrogen and phosphorus in the sewage are removed;finally, the wastewater passes through a second sedimentation tank for carrying out water-sewage separation on the sewage subjected to nitrogen and phosphorus removal; through the flocculation tank, separated phosphorus ions flocculate and coagulate and then are filtered by contacting with the filter screen in the filter tank, so that biological phosphorus removal is carried out on the P-containing raw water, the phosphorus removal effect is greatly improved, and meanwhile, in the phosphorus removal process, the phosphorus content of the discharged water is greatly reduced by repeatedly and circularly removing phosphorus.

The invention discloses a bioactive carbon source for sewage treatment and a preparation method thereof. The bioactive carbon source comprise the following raw materials in parts by weight: 30 to 35 parts of polyol, 10 to 20 parts of chitin, 0.5 to 1.5 parts of vitamins, 3 to 6 parts of glucose, 20 to 22 parts of crude glycerol, 2 to 5 parts of strains and 20 to 25.5 parts of deionized water, wherein the strains are any one or a combination selected from the group consisting of bacteria, actinomycetes, saccharomycetes and molds. The invention relates to the technical field of sewage treatment.According to the bioactive carbon source for sewage treatment and the preparation method thereof, the polyol is used as a substrate; the chitin, the vitamins, the glucose, the crude glycerol and thestrains are used as raw materials to form a carbon source; the bioactive carbon source prepared by using the preparation method provided by the invention can reach a COD equivalent of 200000 mg/L or above and a pH value of 5 to 7; denitrification nitrogen removal is effectively promoted; biological phosphorus removal is reinforced; the input cost is low; the adding amount is small; the operation cost is greatly reduced; the explosive and inflammable characteristics of methyl alcohol and ethyl alcohol serving as carbon sources are avoided; potential safety hazards are eliminated; and the purpose of safe use is achieved.

The invention relates to a multistage aerobic enhanced phosphorus removal APO-M system. The system includes an anaerobic pool (AP), an aerobic pool (O) and an MBR pool (M). The anaerobic pool is communicated with the aerobic pool, the aerobic pool is communicated with the MBR pool, wherein the system also includes a chemical phosphorus removal agent adding device for adding of a chemical phosphorus removal agent into the MBR pool. The aerobic pool is used for aerobic treatment, including biological phosphorus removal, on sewage; the MBR pool is used for further aerobic treatment of sewage andchemical phosphorus removal treatment. The invention also relates to a multistage aerobic enhanced phosphorus removal APO-M technology adopting the system for simultaneous biological phosphorus removal and chemical phosphorus removal on sewage. The system and process provided by the invention can reach a high standard effluent level with a total phosphorus content of less than or equal to 0.2mg/L,and can achieve chemical phosphorus removal in the MBR pool, and have the advantages of space saving, investment saving and easy maintenance.

The invention discloses a system for realizing phosphorus recovery in the process of enhanced biological phosphorus removal and a recovery method thereof. The system comprises a main reactor, a secondary reactor, a muddy water separation device, a chemical settling pond, a water supply device, a drain device, a stirring device and an oxygen supply device, wherein the main reactor is used for carrying out sequencing batch activated sludge/wastewater treatment, the secondary reactor is connected with the main reactor and used for carrying out phosphorus release and recovery, the muddy water separation device is applied to the secondary reactor, and the oxygen supply device supplies oxygen to the insides of the reactors; and the system is characterized in that the system also comprises a time control unit, and the time control unit is respectively connected with the water supply device, the drain device, the stirring device and the oxygen supply device and used for controlling the running time of the system. According to the invention, the production of sludge in the process of enhanced biological phosphorus removal can be reduced, the energy consumption of the running of the system can be reduced, and meanwhile, the phosphorus recovery can be simultaneously realized, so that economic benefits are obtained.

The invention discloses a method for enhanced phosphorus removal of a membrane bioreactor. The method comprises the following steps: introducing sewage into an anaerobic pond for anaerobic treatment;introducing anaerobic purified water into an anoxic pond for anoxic treatment; introducing anoxic purified water into an aerobiotic pond for aerobiotic treatment; introducing aerobiotic purified waterinto a membrane pond and adding chemical phosphorus removal drugs for chemical phosphorus removal treatment; performing first-level reflux treatment on a part of phosphorus-removed purified water andreturning to the aerobiotic pond; performing second-level reflux treatment on a part of aerobiotic purified water and returning into the anoxic pond; performing third-level reflux treatment on a partof anoxic purified water and returning into the anaerobic pond. Total phosphorus concentration of phosphorus-removed purified water can be reduced by adjusting second-level reflux ratio, third-levelreflux ratio and/or dosage of chemical phosphorus removal drugs. The method provided by the invention is capable of flexibly and effectively coping with fluctuation of pollutant load of to-be-treatedsewage, realizing synchronous carbon removal and nitrogen and phosphorus removal, guaranteeing total phosphorus concentration of phosphorus-removed purified water not higher than 0.3 mg/L all the time and reaching level A standard of urban wastewater discharge.

The invention discloses a method for reinforcing anaerobic biological phosphorus removal of wastewater through biological carbon coupling micro-current, and belongs to the technical field of wastewater treatment. According to the method, anaerobic sludge of a municipal sewage treatment plant is inoculated into phosphorus-containing wastewater to be treated, then biological carbon is added, stirring is carried out for uniform mixing, the pH value of the wastewater is adjusted, the current intensity of the reaction system is controlled through an external voltage-stabilized constant-current power supply, and the anaerobic digestion is carried out at the temperature of 15-35 DEG C. Under the action of biological carbon coupling micro-current to the phosphorus-containing wastewater, anaerobicmicroorganisms convert phosphate into a gaseous phosphine, and the gaseous phosphine escapes from the water body, so that the total content of phosphorus entering a subsequent biochemical unit is reduced, and the biological phosphorus removing effect of the anaerobic-anoxic-aerobic biochemical treatment system is obviously improved. The technological process is simple, the period is short, and thephosphorus removal effect is obvious.

The invention discloses an enhanced biological phosphorus removal method, and belongs to the field of sewage treatment. Through the biological phosphorus removal effect enhancing by microalgae, the method aims at solving the problem that the existing phosphorus removal process cannot simultaneously ensure the operation effect and the operation cost. The method has the technical scheme that the method comprises the stages of photosynthetic domestication, photosynthetic enhancing, sewage treatment and the like; active sludge in a sewage plant biochemical pool with the biological phosphorus removal function is used as the inoculated sludge; the starting success is achieved after 60d; the system TP removal load can reach 0.04 kgP/kgMLSS.d to the highest degree; the in-system sludge VSS/TSS is greater than 0.80. The process has the advantages that the total phosphorus is removed; the total phosphorus removal rate is high; the rest sludge fertilizer effect is high; the energy consumption and the chemical consumption are low; the reaction speed is high; the occupied area is reduced; the method is applicable to the treatment of various kinds of phosphorus-containing waste water; the enhanced biological phosphorus removal method is particularly applicable to phosphorus removal of carbon-source-insufficiency sewage and phosphorus removal purification of polluted natural water bodies.

The invention discloses a treatment method for removing ammonia nitrogen in domestic wastewater. A system comprises a water-collecting well, a coarse grid, a primary settling tank, a pH value regulating tank, a cross-linked polyvinylpolypyrrolidone supporter absorption and purification system, an aeration tank, a biological phosphorus removal tank, a secondary settling tank, a clear water tank, a pickling tower and the like. The system creatively utilizes the selective absorption of polyvinylpolypyrrolidone (PVPP) for the ammonia nitrogen in the wastewater, and a carbanyl group in a molecular structure can be compounded with an amino group to form a hydrogen bond complex. Artificial zeolite containing the cross-linked polyvinylpolypyrrolidone is mixed with the domestic wastewater to fully absorb the ammonia nitrogen in the domestic wastewater; the absorbed ammonia nitrogen is released by the cross-linked polyvinylpolypyrrolidone in a form of ammonia in a heating desorption manner, and tail gas is discharged after pickling and purification treatment. Meanwhile, the domestic wastewater in which the ammonia nitrogen is removed by cross-linked polyvinylpolypyrrolidone-artificial zeolite supporter absorption enters a next treatment link.

The invention discloses a method for coupling composite biological nitrogen removal with enhanced biological phosphorus removal, and belongs to the field of biological sewage treatment. Through the combined action of autotrophic nitrogen removal and heterotrophic nitrogen removal such as short-cut nitrification, anaerobic ammonia oxidation and denitrification, a large number of carbon sources can be saved while nitrogen removal is performed, and the aim of synchronous nitrogen and phosphorus removal is achieved by coupling an enhanced biological phosphorus removal process. The method solves the problem of nitrogen and phosphorus removal of the domestic sewage with low carbon nitrogen ratio under mainstream conditions, does not need additional carbon sources and chemical agents, saves the cost, and has no secondary pollution; hRT is low, the size and occupied area of a sewage treatment structure can be saved, and the investment and construction cost is reduced; through organic combination of autotrophic nitrogen removal and heterotrophic nitrogen removal, the system has better impact load resistance when coping with inflow water quality fluctuation, so that low consumption, high efficiency and stability in operation of the system can be ensured, the operation and maintenance are simple, engineering application and popularization are easy, and a clean, high-efficiency, low-consumption and stable technical scheme is provided for simultaneous nitrogen and phosphorus removal of domestic sewage.