822results about How to "Improve nitrogen removal efficiency" patented technology

One kind of short range nitrifying-anaerobic aminoxidizing sequencing batch type denitrifying biomembrane mode and plant is disclosed. The limited aerating mode with real-time control of the sewage temperature inside the reactor and high frequency alternation between aeration and anaeration can inhibit the growth of nitrite oxidizing bacteria and denitrifying bacteria so that the aminoxidizing bacteria and the anaerobic aminoxidizing bacteria become the dominant bacteria in the nitrifying and denitrifying stages. In the nitrifying stage, nitrification is stopped in the nitrite step; and in the denitrifying stage, ammonia nitrogen acts as the direct electron donor to reduce nitrite. The plant is provided with fixed spherical composite stuffing with spherical shell of polypropylene and filled inside biological composite material. Sectional discrete water feeding mode is adopted to feed the sewage to be treated in four stages into the reactor.

Disclosed is a technique for processing organic waste water, including the following steps: (a) preprocession: pour the waste water into the micro electrolytic reducing pool where the iron-carbon micro electrolytic reaction occurs under the agtatering effect, add hydrogen peroxide into it to have. Fento oxidation, then the water enters into coagulation pool into which add NaOH and PAM; (b) anaerobe hydrolysis oxidation procession: power the organic waste water preprocessed into high effective anaerobe hydrolysis oxidation pool in which add into the TCBS reactor in which add into high effective compound microbe, making the water mix with the flowing-back mud with high density after denitrification. The invention can increase the biochemical of organic waste water, strengthen its resistance to poison and impact as well as the biological denitrification funcation, and making the waste water reach the national environment protection requirement by reducing the polluting load by steps.

The invention provides an integrated internal circulation type denitrification and decarburization bio-membrane reactor and an operating method thereof. The main body of the reactor consists of an anoxic zone on the lower part, an aerobic zone on the upper part and a settling zone on the periphery of the aerobic zone; a composite filler is filled in the anoxic zone, and a water inlet pipe is communicated with the bottom of the anoxic zone; the aerobic zone is partitioned into a filler zone for adding a carrier on the upper part and a mud-water mixing zone on the lower part by adopting an orifice plate, the anoxic zone and the aerobic zone are partitioned through an impermeable partition plate, and a plurality of aeration pipes are arranged at the bottom of the aerobic zone and provided with air inlet pores; and the settling zone consists of three parts, namely a clean water zone, a contact settling zone and a sludge returning zone which are sequentially arranged from top to bottom, wherein the bottom of the sludge returning zone is provided with a sludge returning seam and communicated with the bottom of the aerobic zone. The reactor realizes zero power consumption in sludge returning, and is compact in structure; and a back flushing system is not required in the contact settling zone, and additional agents and carbon sources are not required, so that the reactor is low in running cost.

The invention discloses a device for autotrophic nitrogen removal by combining A/O shortcut nitrification of sludge digestion liquid and anaerobic ammonium oxidation of granular sludge and a method thereof. The device of the invention comprises a digestion liquid tank, an A/O shortcut nitrification tank, a sedimentation tank, a middle water tank, an anaerobic ammonium oxidation tank, wherein, the digestion liquid tank is communicated with a first cancellus as an anoxic zone of the A/O shortcut nitrification tank by the inlet pump of the A/O shortcut nitrification tank; the sedimentation tank the upper part of which is communicated with the middle water tank by a water pipe is provided with a central pipe and the anaerobic ammonium oxidation tank is provided with a water bath sleeve and a granular sludge bed. In addition, the method of the invention comprises the following steps of starting the A/O shortcut nitrification tank; starting the anaerobic ammonium oxidation tank of the granular sludge; operating an autotrophic biological nitrogen removal system in series after the starting of the A/O shortcut nitrification tank and the anaerobic ammonium oxidation tank is respectively completed. The device and the method of the invention are applicable to the shortcut nitrification and the nitrogen removal of the sludge digestion liquid in a sewage treatment plant and have the advantages of advanced technology, simple structure of the device, convenient operation and good treatment effect of water purification.

The invention discloses a method for processing coal gasification wastewater. The method sequentially comprises the following steps: a. carrying out preprocessing on the coal gasification wastewater in a preprocessing step comprising oil removal processing, coagulation processing and optional adjustment processing; then b. leading the preprocessed coal gasification wastewater to sequentially flowthrough a first-class bio-contact oxidation reactor, a biological electrochemical reactor, a second-class bio-contact oxidation reactor and an optional third-class or multi-class bio-contact reactor to carry out biological processing; and c. leading the biologically processed coal gasification wastewater to carry out catalytic oxidation processing in a catalytic oxidation reactor.

The invention discloses an electrochemical biological combined denitrification reactor, which comprises a tank body, an electrode plate, a particle electrode, an aerating apparatus and a constant current transformer. Both ends of the tank body are respectively provided with a water inlet and a water outlet. The electrode plate comprises an anode arranged on the center part of the tank body and a cathode which surrounds the anode to be arranged at the position close to the tank wall; the anode and the cathode are respectively connected with an anode and a cathode of the constant current transformer; the particle electrode is filled between the anode and the cathode; and the aerating apparatus comprises a fine bubble aerator arranged on the bottom of the tank body and an air pump connected with the fine bubble aerator. The device of the invention has compact and simple structure, small occupied area, high current utilization rate and rapid biofilm formation of microbe, can simultaneously remove various pollutants, such as organic matter, ammonia nitrogen and the like, has high denitrification efficiency and low energy consumption, is easy to regulate and control and is a multiple three-dimensional electrode biomembrane sewage treatment device integrating biology with an electric microfield into whole body.

The invention provides a device and a method for treatment of low-temperature and low-carbon ammonia nitrogen wastewater on the basis of solid-phase denitrification and heterotrophic nitrification-aerobic denitrification. The device comprises a reactor and a reflux system, wherein the upper part and lower part of the reactor are respectively provided with a fluidized bed aerobic zone and a filterpool anoxic zone which are filled with a solid carbon source filling material and separated by a porous water distribution plate; an aeration tube is arranged on the water distribution plate and connected with an aeration device through a gas flowmeter; the lower end of the reactor is provided with a water inlet; the upper end of the reactor is provided with a water outlet; an effluent of the reactor enters a secondary sedimentation tank, and an effluent of the secondary sedimentation tank enters an intermediate water storage tank through an overflowing opening; the upstream end of the refluxsystem communicates with an effluent of the intermediate water storage tank; the downstream end of the reflux system communicates with the reflux opening of the lower end of the reactor through a liquid flowmeter; and the interior of the fluidized bed aerobic zone is provided with a dissolved oxygen monitor and a nitrate concentration monitor. The device and the method provided by the invention can still realize highly-efficient removal of ammonia nitrogen and total nitrogen under the conditions of low temperature and low carbon.

The invention discloses a method for treating caprolactam-containing waste water. The method comprises the following steps of 1, putting production waste water needing to be treated into an adjustment tank to carry out preaeration treatment, and feeding the treated production waste water into a coagulation sedimentation basin to carry out coagulation sedimentation, 2, carrying out anaerobic degradation, 3, carrying out aerobic degradation, 4, carrying out secondary coagulation sedimentation to obtain settled sludge, feeding the settled sludge back to an anoxic tank to carry out microbe amount supplement, feeding residual sludge back to a sludge tank, disinfecting water treated in a secondary coagulation sedimentation tank, and discharging directly the disinfected water to the environment, and 5, carrying out press filtration of sludge in the sludge tank by a plate and frame filter press, and feeding the filtrate to the adjustment tank. The invention also discloses a device adopting the method. Compared with the traditional technology, the method for treating caprolactam-containing waste water has high nitrogen removal efficiency and good treatment effects. The device for treating caprolactam-containing waste water has the advantages of simple structure and good waste water treatment effects.

An acinetobactersp and ammonia nitrogen degrading method of waste water are disclosed. It includes: adding at least one of C1-C6 organic substances with 0.01-1wt%, adding Acinetobactersp and waste water with 10 to the power 5-10 to the power 12 bacterium/ml concentration, and aerating under gas-water ratio 10-15. It achieves environmental protection, simple process, high efficiency.

The invention discloses a sequencing batch internal circulation biological denitrification process. The process mainly comprises four steps of water feeding, biological denitrification reaction, precipitation and water and mud discharge. The biological denitrification reaction comprises an internal circulation reaction from short-cut nitrificaition treatment to deoxidation treatment, anaerobic ammoxidation treatment and to the short-cut nitrificaition treatment, and the short-cut nitrificaition treatment, the deoxidation treatment and the anaerobic ammoxidation treatment are carried out in three intercommunicated different reaction areas of one reactor. The invention further discloses a biological denitrification device. The device is separated into three intercommunicated reaction areas, that is, a short-cut nitrificaition treatment reaction area, a deoxidation treatment reaction area and an anaerobic ammoxidation treatment reaction area. The device is further equipped with an aerating device, an internal circulation pump, a water distributor and the like. The process has the advantages of convenient operation management, low energy consumption, high denitrification efficiency and stable treatment effect, and the device matching the process has the advantages of compact structure, convenient use, low cost and the like.

The invention relates to a heterotrophic nitrifying and aerobic denitrifying bacterium for efficient denitrification, and the culture and application of the heterotrophic nitrifying and aerobic denitrifying bacterium. The bacterium belongs to an acinetobacter species (Acinetobacter), with the name of Acinetobacter sp.Y1, the preservation registration number of CGMCC NO.6563, the preservation institution of China Microorganism Culture Preservation Management Council General Microbiological Center and the preservation time of September 14th, 2012. The bacterium is separated from activated sludge of coking wastewater, can not only quickly remove ammonia nitrogen, but also grow under the condition that nitrite and nitrate are taken as sole nitrogen sources, and effectively removes nitrite nitrogen and nitrate nitrogen, and can be applied to nitrogen-containing wastewater treatment.

The invention discloses a nitration method of iron-carbon nitrosation, a reactor therefor and a method of sewage water denitrogenation. Iron filings and active carbon are added in the reactor hierarchically or mixed, water containing ammonia nitrogen is supplied in the reactor and oxygen enriched air is blew in thereof, only inorganic iron-carbon in condition of aeration, ammonia nitrogen is conversed into nitrite and nitrate steadily. The reactor is composed of a supporting layer, a back purge system, a water-inlet- distribution device, a air diffuser, iron/carbon composite material, a drift eliminator and bed body, nitrosation or nitration is finished in action of ammonia sewage water. The reactor is combined with a denitrify reactor, a anaerobic bioreactor, or used as a aeration biological filter of biology filler to finish denitrification process of nitrogen sewage water. The reactor has advantages of stable performance, high efficiency, low power cost and simple maintenance. An integrated denitrification technics is formed in the reactor, denitrification efficiency of the whole flow is improved.

The invention relates to a horizontal underflow constructed wetland capable of strengthening denitrification at a low temperature. The constructed wetland consists of a water distribution region, a filling region, an aeration device, a water collecting region and wetland plants, wherein large-grain detritus is positioned in the water distribution region and the water collecting region; the filling region is arranged between the water distribution region and the water collecting region; medium-grain detritus, medium-grain zeolite and fine-grain detritus are positioned in the filling region sequentially; and aeration pipes are laid on the bottom layer of a zeolite segment and the aeration quantity is adjustable. Sewage is subjected to pretreatment, so that suspended matters and part of pollutant are removed, and then the sewage is subjected to constructed wetland purification treatment. The horizontal underflow constructed wetland can greatly improve the dissolved oxygen concentration of the sewage and the ammonia nitrogen adsorption capacity of regenerated zeolite in the horizontal underflow constructed wetland and can maintain high-efficiency and stable nitrogen removal rate of a system.

The invention relates to a method for deep denitrification of low carbon source urban sewage and belongs to the technical field of biological sewage treatment. Urban sewage and refluent nitrification liquid enter a short-range denitrification anaerobic ammonium oxidation area of a deep denitrification bioreactor, denitrifying bacteria on a biofilm outer layer reduce nitrate nitrogen in the refluent nitrification liquid into nitrite by utilizing a limited organic carbon source in raw water, and anaerobic ammonium oxidizing bacteria on a biofilm inner layer enable the generated nitrite nitrogen and ammonia nitrogen in part of raw water to react and be converted into nitrogen; the sewage enters an aerobic area to be subject to short-range nitration, so that the remaining part of ammonia nitrogen of the sewage is converted into nitrite nitrogen; then the sewage enters the anaerobic ammonium oxidation area, enters the aerobic area and the anaerobic ammonium oxidation area, and finally enters a nitrification area, so that the nitrate nitrogen and the ammonia nitrogen in the raw water are oxidized to be nitrate nitrogen. According to the method, through the united application of short-range denitrification-anaerobic ammonia oxidation and short-range nitrification-anaerobic ammonia oxidation, the deep denitrification of the low carbon source urban sewage is performed.

The invention discloses an integrated oxidation ditch and a construction and operation method thereof. The construction and operation method has the technical proposal that the integrated oxidation ditch is divided into an anoxic zone, an anaerobic zone and an aerobic zone, which are communicated mutually, the anoxic zone and the anaerobic zone are arranged at one end of the integrated oxidation ditch in common, the aerobic zone is arranged at the other end of the integrated oxidation ditch, and a water-retaining wall is arranged at the middle part of each zone to cause each zone to be formed a single annular channel, water inlet pipes used for feeding water by the division point way are arranged at the anoxic zone and the anaerobic zone, an aeration device is arranged in a circulation channel at one side of the aerobic zone communicated with the anoxic zone, and a mud-water separation device used for the mud-water separation and the water emission is built on the side wall of the aerobic zone for the water emission. The aeration device is started, and the sewage passes through the anoxic zone, the anaerobic zone, the aerobic zone, and the mud-water separation device in sequence, so the dephosphorization and the denitrification as well as the decarbonization treatments of the sewage are realized. The integrated oxidation ditch has the advantages of simple structure, lower cost, small occupation area, and good sewage treatment effect, and can particularly and effectively perform the dephosphorization and the denitrification simultaneously.

The invention belongs to the technical field of biological filter beds, and particularly relates to a multi-stage aerobic-anaerobic compound biological filter bed, comprising a water inlet pipe and more than two stages of filter beds; the height of a liquid level of each stage of the filter bed is gradually reduced and each filter bed is divided into a water inlet groove, a filtering chamber and a water outlet groove by rectification walls; each filtering chamber is filled with filler layers; the grain diameters of fillers of the filler layers at the two sides are great and the grain diameters of the fillers of the middle filler layer are small; the grain diameters of the fillers of the middle filler layer are sequentially reduced according to the stages of the filter beds; a water outlet end of the water inlet pipe is arranged at the bottom of the water inlet groove of the foremost stage of the filter bed and the bottoms of the water outlet grooves of the upper and lower stages of the filter beds are communicated through a siphon; the bottom of the water outlet groove of the final stage of the filter bed is connected with a water discharging groove; the middle filler layer is internally provided with a ventilated vertical pipe, a ventilated main pipe and a ventilated branch pipe; the ventilated branch pipe is provided with air vents at intervals and plants which can degrade pollutants are planted at the upper parts of the filler layers. With the adoption of the structure, the multi-stage aerobic-anaerobic compound biological filter bed provided by the invention has the advantages of small occupied area, convenience for construction, lower cost, wide application range and the like.

The invention relates to a method for preparing ecological water purification particles mainly from denitrification biological microcapsules and sustained-release carbon sources and effectively solves problems of denitrification microorganism insufficiency of micropollution water, low C/N ratio, poor biodegradability, difficulty in recovery and secondary pollution. The method includes: culturing a microbial strain to obtain denitrification microorganisms; dissolving chitosan into acetic acid solution to obtain chitosan solution; dissolving sodium alginate into water, and adding span 80 to obtain sodium alginate solution; well mixing the sodium alginate solution with the denitrification microorganisms, dropwise adding CaCl2 solution to obtain calcium alginate capsules, and putting the calcium alginate capsules into the chitosan solution to obtain microcapsules through secondary solidifying; putting the microcapsules into sodium citrate solution, and performing interlayer calcium alginate liquefying to obtain biological microcapsules; well mixing hydrophilic materials, pore-forming materials, adhesives, the sustained-release carbon sources and the biological microcapsules to obtain spherical ecological water purification particles, and curing. The method has advantages of rich materials, low cost, freeness of toxicity and harms to microorganisms, recyclability and freeness of secondary pollution.

The invention discloses a modified biological filtering pool filler and relates to a modified filler applied to an aerated biological filtering pool and a method for processing the same. An inorganic filler ceramic particle, lava or porous ceramic, which is used as a carrier, is subjected to pickling, alkali cleaning, drying, sterilization and other processing procedures and is dipped in a dilute aqueous solution containing cationic polyacrylamide (Polyacrylamide, abbreviated as PAM) so that the inner surface of the filler is modified to obtain an inorganic carrier of which the surface of an inner hole is formed with a polymer molecular body with positive charge; and the inorganic carrier is domesticated to generate the immobilized microorganism filler. Through double functions of physical adsorption and ionic bond combination, the filler improves physicochemical performance and washing resistance performance of the immobilized microorganism for inorganic carrier, is favorable for improving loading amount of microorganism and domestication and proliferation of the microorganism, saves the cubage of a reactor, shortens reaction time, improves efficiency biological denitrification and saves investment.

The invention relates to a method for removing sulfur oxides and nitrogen oxides in catalytic cracking regeneration flue gas. According to the invention, regeneration flue gas discharged from a catalytic cracking regeneration device is delivered into a high-temperature zone reactor, and is subjected to a reaction at a catalyst bed layer with a reducing gas under a temperature of 620-690 DEG C; sulfur oxides, nitrogen oxides and oxygen in the flue gas are subjected to the reaction with the reducing gas, such that gas-state elemental sulfur, nitrogen and water vapor are produced; after the reaction, a mixed flue gas containing gas-state sulfur is delivered into a flue gas turbine, and is delivered into a middle-temperature zone reactor; under a temperature of 500-550 DEG C, the mixed flue gas is subjected to a reaction with reducing gas, such that gas-state elemental sulfur, nitrogen and water vapor are produced; after the reaction, a mixed gas is delivered into a waste heat boiler and is subjected to heat exchange until a temperature is 150-250 DEG C, and liquid-state sulfur is recovered; and the material is subjected to heat exchange in a cooling device, and solid-state sulfur is recovered. With the method provided by the invention, a subsequent desulphurization treatment process of sulfur-containing flue gas of a catalytic cracking device is eliminated, a catalytic cracking device pollutant controlling process is simplified, and powerful guarantee is provided for clean production of the catalytic cracking device.