36results about How to "Increase nitrification rate" patented technology

The invention discloses a SBR alternant aerobic/anaerobic technology for biological denitrification and real time control device and method thereof which consists of, dividing the waste water to be treated into three portions, loading each portion into a reactor, alternatively carrying out the operating mode of aerobic aeration and anoxybiotic agitating under real time procedure control, so as to realize the organics degradation and nitrogen-containing compound removal.

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 discloses a device and a method for realizing partial short-range nitrification-anaerobic ammonia oxidation by adding hydroxylamine, and belongs to the field of urban domestic sewage biological treatment. For two-stage partial short-range nitrification-anaerobic ammonia oxidation, the stable operation of the short-range nitrification is crucial to a process; the short-range nitrification is very difficult to start and maintain stably only through process parameter control; a very good nitrite accumulating effect can be achieved by adding the hydroxylamine in the patent; partial short-range nitrification reactors can be started and high nitrite accumulation can be maintained within a short time. The hydroxylamine serves as an intermediate product in a nitrifying process, is a reducing agent of ammonia monooxygenase and a stimulating agent of AOB (Ammonia Oxidizing Bacteria) and can improve the cell yield of the AOB; meanwhile, the hydroxylamine is an inhibiting agent of NOB (Nitrite Oxidizing Bacteria) and can elutriate the NOB. Compared with a conventional denitrogenation process, a partial short-range nitrification-anaerobic ammonia oxidation process can save aeration quantity and carbon source, and is particularly suitable for urban domestic sewage with low C/N.

The invention belongs to the field of sewage treatment and provides a short distance denitrifying dephosphatation double-sludge technique taking granular sludge as medium and a device thereof. The device sequentially comprises a raw water pipe, a water inlet tank and a water inlet valve, and is characterized by further sequentially comprising an anaerobic/anoxic SBR reactor and an intermediate water tank which are connected with each other by a pipeline as well as a short distance nitration SBR reactor and a back flow water tank that are also connected with each other by the pipeline; wherein the intermediate water tank is connected with the short distance nitration SBR reactor, and the back flow water tank is connected with the anaerobic/anoxic SBR reactor; the anaerobic/anoxic SBR reactor and the short distance nitration SBR reactor are internally provided with stirring devices, and a drain pipe is arranged on the anaerobic/anoxic SBR reactor; the short distance nitration SBR reactor is internally provided with an aerating apparatus; the granular sludge which is processed by acclimatization and has the function of denitrifying dephosphatation is put into the anaerobic/anoxic SBR reactor, and the granular sludge which is processed by acclimatization and has the function of short distance nitration is put into the short distance nitration SBR reactor. The invention solves the problems of unstable effect of nitrogen and phosphorus removal of sewage, high content of effluent suspended matter and lower pass rate, so as to be used for low C/N waste water treatment.

The invention discloses a method for degrading ammonia nitrogen in high-salinity sewage by microbes, wherein a treatment system in the method comprises an anaerobic biochemical reaction tank, a first-stage aerobic biochemical pool and a second-stage aerobic biochemical pool. Firstly, the sewage and the recirculation water simultaneously flow into the anaerobic biochemical reaction tank to be treated by denitrification and hydrolysis reaction; then, the sewage orderly flows into the first-stage aerobic biochemical pool and the second-stage aerobic biochemical pool to be respectively treated by first-stage aerobic treatment and the second stage aerobic treatment; the active sludge in the first-stage aerobic biochemical pool is the domesticated salt-tolerant bacteria for performing first-stage nitration on the ammonia nitrogen, and besides the domesticated salt-tolerant bacteria, efficient nitrifying bacteria are also added into the second-stage aerobic biochemical pool for performing second-stage high-strength nitration on the ammonia nitrogen=, thus, the effluent ammonia nitrogen and the COD (Chemical Oxygen Demand) can reach the emission standard.

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 discloses a sewage treatment system which comprises a grating, a grit tank, a preaeration tank, an anaerobic tank, an anoxia tank, an aerobic tank and a secondary sedimentation tank. Sewage enters the grit tank after being treated by the grating, water discharged from the grit tank sequentially enters a biological treatment unit composed of the anaerobic tank, the anoxia tank and the aerobic tank to be treated, obtained mixed liquid enters the secondary sedimentation tank, two outlets are arranged on the secondary sedimentation tank, one outlet is a discharging port of treated sewage, and the other outlet is a discharging port of surplus sludge. A bypass is arranged on the discharging port of the surplus sludge, and one part of the surplus sludge discharged from the secondary sedimentation tank flows back to the preaeration tank through a sewage backflow pump. Simultaneously, one part of the mixed liquid from the aerobic tank flows back to the anoxia tank through a mixed liquid backflow pump on the bypass. The sewage treatment system has the advantages of being high in nitrobacterium activity, high in nitrification rate, high in ammonia nitrogen removing rate and the like.

The invention relates to a reinforced-denitrification MBR (membrane bioreactor) sewage treatment method which comprises steps as follows: (1) pretreated town sewage enters an anoxic tank together with 300-400% of reflux precipitation tank sludge and 200-400% of reflux membrane tank nitrification solution, and denitrifying bacteria reduce nitrate nitrogen carried by reflux into nitrogen by using a carbon source in the sewage; (2) the effluent of the anoxic tank enters a precipitation tank to be subjected to sludge-water separation together with the refluxed membrane tank nitrification solution, part of the precipitated sludge refluxes to the anoxic tank, and the rest of sludge is discharged; and (3) the effluent of the precipitation tank enters a membrane tank to be nitrified so as to oxidize ammonia nitrogen into nitrate nitrogen, a pump extracts water from the membrane tank via the intervals of the membrane, and the effluent water is discharged or reused. The invention sufficiently combines the inherent characteristics of the MBR and MBBR (moving bed biofilm reactor) techniques, reduces the influence of the biological denitrification influencing factor, and has the characteristics of high denitrification efficiency, high denitrification stability, simple process and the like.

A process for treating the coking sewage by culturing and naturalizing the nitrifying bacteria and the denitrifying bacteria is disclosed. The process for culturing and naturalizing the denitrifying bacteria includes filling the mixed liquid from aerobic pool into anaerobic pool, flowing the supernatant from depositing pool back into anaerobic pool, inoculating denitrifying bacteria, culturing and naturalizing. The process for culturing and naturalizing the nitrifying bacteria includes introducing the nitrogen-contained sewage to aerobic pool, culturing naturalizing.

The invention discloses a biological sewage treatment device and a biological sewage treatment method for synchronous nitrogen and phosphorus removal and sludge reduction. The device comprises a water inlet pipe 1, an anaerobic pond 2, a mid-sedimentation tank 3, an intermediate pool 4, a BAF 5, an anoxic pond 6, a post-aeration tank 7, a secondary sedimentation tank 8, and a water outlet pipe 9 in series connection in order; the treatment process comprises the following steps: mixing raw water and P-rich returned sludge in the anaerobic pond, wherein denitrifying phosphorus accumulating bacteria (DPBs) absorb and store VFA in a body in a form of PHB (poly-beta-hydroxybutyrate) and release a large amount of phosphorus; removing VOD remained in the BAF and nitrating the nitrogen; introducing BAF nitrification liquid and the sludge in the mid-sedimentation tank into the anoxic pond together, wherein the DPBs performs denitrification for absorbing the phosphorous by using the PHB in the body as an energy source and a carbon source and using NO3<-> as an electron acceptor; removing the unnecessary phosphorus contained in the post-aeration tank and blowing off the nitrogen to prevent the sludge from floating upwards; discharging the supernatant in the secondary sedimentation tank, wherein part of the sludge containing a large amount of DPBs is refluxed and the remaining sludge is discharged. The biological sewage treatment device and the biological sewage treatment method for the synchronous nitrogen and the phosphorus removal and the sludge reduction resolves the conflict between the denitrification and the phosphorous removal, and ensures the stable water quality of effluent and low yield of the sludge.

The present invention relates to the technical field of environmental microorganisms and water treatments, and particularly relates to a nitrifying bacterium agent and a preparation method thereof. The preparation method of the nitrifying bacterium agent comprises: A) activated sludge in an aerobic pond is used as a source of bacteria and enriching and cultivating are conducted by using a nitrifying bacterium inorganic salt culture medium to obtain enriched culture bacterium liquid; the nitrifying bacterium inorganic salt culture medium comprises the following components: ammonium sulfate, sodium carbonate, sodium chloride, magnesium sulfate, ferrous sulfate, trace element mother liquid and water; and the trace element mother liquid comprises the following components of zinc sulfate, cobalt chloride, manganese chloride, boric acid, sodium molybdate and water; B) the enriched culture bacterium liquid is used as a seed and high ammonia nitrogen wastewater is used for gradient domestication culture; and C) after the gradient domestication culture is completed, expanding culture is performed to obtain the nitrifying bacterium agent. The prepared nitrifying bacterium agent has relativestrong tolerance in the high ammonia nitrogen wastewater and high in nitrifying activity.

The invention provides a blue-green algae mud pressure filtrate treatment method, which enables a blue-green algae mud pressure filtrate treatment system to be more stable and efficient, and improves the practical application value of a blue-green algae mud pressure filtrate treatment technology. A blue-green algae mud pressure filtrate treatment method is characterized by comprising the following steps: S3, carrying out pressure filtration on blue-green algae mud with the moisture content of 85-95%, carrying out air stripping process treatment on the produced blue-green algae pressure filtrate, and reducing the ammonia nitrogen concentration in the blue-green algae mud pressure filtrate by 20-40%; S4, adding soluble carbonate into the blue-green algae mud pressure filtrate treated by the air stripping process, and precipating calcium ions; S5, introducing ozone into the blue-green algae mud pressure filtrate obtained after calcium ion precipitation treatment for oxidation; S6, treating the blue-green algae mud pressure filtrate subjected to ozone oxidation through an anaerobic bioreactor (such as an up-flow anaerobic sludge blanket reactor) system; and S7, treating the blue-green algae mud pressure filtrate through an aerobic bioreactor system (such as an A/O water treatment process-membrane bioreactor process).

The invention discloses a double sludge oxidation ditch denitrification phosphate-removing apparatus and a method thereof. The apparatus comprises an oxidation ditch; an anaerobic zone, an anoxic zone and a water outlet zone which are communicated in order are arranged in the oxidation ditch, an independent nitrification zone is arranged between the anaerobic zone and the anoxic zone along the sewage flowing direction, a pre-anaerobic zone is arranged between the anoxic zone and the anaerobic zone, the independent nitrification zone is separated with the anaerobic zone and the anoxic zone through a first baffle plate and a second baffle plate, a first mud-separation zone, a filling material zone, a second mud-separation zone and a current stabilization zone are arranged in order along the sewage flowing direction, and nitrobacteria is enriched in the filling material zone. The denitrification phosphate-removing method is characterized in that a main channel of the oxidation ditch is always in an anaerobic/anoxic state, so that the denitrifying phosphorus-removing bacteria can be a dominant bacteria, the filling material is employed for hanging a membrane in the independent nitrification zone, so that a stable living environment is provided for nitrobacteria, nitrobacteria biomass in the independent nitrification zone is increased, nitrification rate is increased, and denitrification phosphate-removing effect can be guaranteed.

The invention provides an integrated denitrification membrane bioreactor and a sewage treatment method using the integrated denitrification membrane bioreactor. The integrated denitrification membrane bioreactor is provided with at least one reaction tank, and the reaction tank comprises a first aerobic unit area, an anoxic unit and a second aerobic unit area; partition plates are respectively arranged between the aerobic unit area I and the anoxic unit and between the anoxic unit and the aerobic unit area II; a convex slope is arranged at the bottom of the anoxic unit. According to the integrated denitrification membrane bioreactor disclosed by the invention, microorganisms can better adapt to an aerobic and anoxic coexistence environment, the problem of poor denitrification effect caused by sludge backflow is avoided, pollutants such as nitrogen and organic matters in domestic sewage are efficiently and stably removed, and the denitrification treatment effect is enhanced.

The invention discloses a carbonate type ammoxidation process and a strengthening technology thereof. According to the method, a proper amount of carbonic acid compounds are supplemented into the wastewater to serve as an electron acceptor for ammonia nitrogen autotrophic oxidation and a carbon source for nitrifying bacteria anabolism; nitration of ammonia nitrogen under an anaerobic condition is realized by regulating and controlling environmental factors such as proper temperature and pH value and working conditions such as hydraulic retention time and sludge retention time, and nitrite nitrogen and nitrate nitrogen are stably generated from the ammonia nitrogen; and by supplementing a proper amount of redox mediator in the system, the ammonia nitrogen nitration/oxidation rate can be increased, the nitration degree is more thorough, and the product is mainly nitrate nitrogen. Aeration oxygen supply is not needed in the whole process, and the construction and operation cost of a rear-mounted biological denitrification process based on the nitrification-denitrification process can be greatly reduced.