33results about How to "Stable short-cut nitrification" patented technology

The invention provides a continuous flow low C/N (carbon/nitrogen ratio) municipal wastewater partial nitrification/ anaerobic ammonia oxidation and denitrification nitrogen removal method, and belongs to the field of wastewater. The continuous flow low C/N municipal wastewater partial nitrification/ anaerobic ammonia oxidation and denitrification nitrogen removal method is characterized in that firstly municipal wastewater enters an oxygen deficiency denitrification zone of a biological nitrogen removal reactor, heterotrophic denitrifying bacteria fixed on biological stuffing use organic matters in raw water as carbon sources and restore nitrate nitrogen in backflow yielding water to nitrogen, then the wastewater enters an aerobic zone and is subjected to partial nitrification reaction, so that a part of ammonia nitrogen is converted to nitrite nitrogen, afterwards the wastewater enters an oxygen deficiency zone, and anaerobic ammonium oxidation bacteria fixed on the biological stuffing convert the part of ammonia nitrogen and the nitrite nitrogen into nitrogen; and afterwards, the wastewater sequentially enters a subsequent aerobic zone and a subsequent oxygen deficiency zone, so that the effects are repeated, and the purpose of removing the nitrogen in the wastewater is achieved in the end. The continuous flow low C/N municipal wastewater partial nitrification/ anaerobic ammonia oxidation and denitrification nitrogen removal method can realize the deep denitrification of low C/N municipal wastewater without addition of an external carbon source and has the characteristics of high nitrogen removal efficiency, low sludge yield and the like.

The invention discloses a method for culturing a nitrosation dominant microflora, which comprises the following three culture stages: a first stage of enriching mixed microflora of nitrosobacteria and nitrobacteria; a second stage of elutriating nitrobacteria by using a high-temperature culture and normal-temperature culture alternating process, gradually improving the dominate position of the nitrosobacteria, and transferring into a third stage of culture when a nitrosation rate is more than 50 percent; and a third stage of changing the dissolved oxygen and pH condition to perform further elutriation of nitrobacteria and the stable domestication of nitrosobacteria till the nitrosation rate is stabilized over 65 percent. Thus, a culture period is finished, a microflora in which the nitrosobacteria take a dominate position is obtained, and the microflora is stored for later used. The method solves the problems of instability and the like in the actual use of short-process nitration, the start time of a nitration process can be shortened, a nitration reaction process can be changed quickly, the application range of short-process nitration can be expanded, and a guarantee is providedfor the actual use of the short-process nitration process in practical projects.

The invention discloses a device which can realize the shortcut nitrification of sludge-digestion liquid through the combined control of FA and FNA. The device is provided with a raw water box, a shortcut nitrification reactor, a sedimentation tank and a water tank; the shortcut nitrification reactor is divided into a hypoxia stirring area and an aerobic zone, and a DO/pH online controller is arranged in the aerobic zone; an air-blast-head is arranged at the bottom of the reactor; a method utilizing the device to realize the shortcut nitrification comprises the following steps: firstly, a system is started; and secondly, the adjustment is carried out in running; the invention is applicable to the nitrification of the sludge-digestion liquid of a sewage treatment plant, the structure of the device is simple, the process of the method is simple, the operation is convenient, a plurality of carbon sources are saved, the nitrification speed is fast, and the effect is good.

The invention discloses a device and a method for realizing sludge digestion fluid short-cut nitrification of continuous flow suspending media. The device is provided with a raw water tank, a denitrification filtering column, a suspending media reactor, a secondary basin and a water outlet tank, wherein the raw water tank is an open casing, the denitrification filtering column is a cylindrical tube, cubic suspending sponge filling materials are filled in the denitrification filtering column, the suspending media reactor is an open basin body with inner cavity divided into a plurality of grid chambers, cubic suspending sponge filling materials are filled in the grid chambers, further the suspending media reactor is equipped with a gas pump, a gas flow meter and an aerated conduit, the secondary basin is a column, and the water outlet tank is a open casing. The method for realizing sludge digestion fluid short-cut nitrification comprises starting the system and adjusting operation in running. The device and the method can save a large amount of denitrification carbon sources, increase denitrogenation efficiency of sewage disposal plants, and achieve the purpose of saving energy and lowering energy consumption.

A device for fast realization of shortcut biological denitrification through salinity inhibition combined with fuzzy control and methods thereof pertain to the technical field of sewage biological denitrification of SBR method and are suitable for sewage disposal in nitrogen-containing industry and advanced treatment of town sewage. The invention adjusts the mass concentration of crude salt of inlet water in 5-7.5 g/L (Cond value is 8.92-12.95 mc/cm) to quick realize the accumulation of nitrite in normal temperature above 90 percent by adding crude salt of a certain concentration (the crude salt is obtained directly by basking seawater without any processing) and combining with controlling the time of nitrification and denitrification in real time, the method is designed to solve the problems of long starting time of the existing shortcut biological denitrification technology and difficulty to maintain. The method can not only fast realize the accumulation of nitrite in high proportion stably in reaction system to enable the nitrating types to be fast and long-time stabilized on shortcut nitrification, but also has the advantages of low cost, flexibility in operation and management and seldom causing sludge bulge, etc.

The invention discloses a device and method for realizing short-cut nitrification-anaerobic ammonia oxidation based on lateral inhibition of hydroxylamine and belongs to the field of urban sewage treatment. Short-cut nitrification is realized in a treatment way that nitrite-oxidizing bacteria (NOB) is inhibited by using hydroxylamine, so that stable nitrite is provided for subsequent anaerobic ammonia oxidation. Hydroxylamine serving as a key intermediate product of a nitrification reaction plays a connecting role for the balance of the whole nitrification process, so that the aims of increasing the cell yield of ammonia oxidizing bacteria (AOB) and inhibiting the activity of NOB can be achieved by appropriately adding hydroxylamine, and furthermore, stable short-cut nitrification is realized. However, hydroxylamine has toxicity, and therefore, AOB and NOB can simultaneously lose activity if hydroxylamine is excessively added. Therefore, the excess problem can be controlled by lateralsludge treatment of hydroxylamine in the patent, meanwhile, short-cut nitrification can be relatively rapidly started, and relatively high nitrite accumulation can be maintained. The method is simplein operation and solves the problem that nitrite is difficult to stably maintain if urban sewage is treated by using a short-cut nitrification-anaerobic ammonia oxidation process.

The invention provides a device and method for biological intensified shortcut biological nitrogen removal of municipal sewage. The device comprises a municipal sewage raw water tank, a municipal sewage anaerobic-oxic (AO) reactor, a municipal sewage secondary sedimentation tank, a sludge digestion liquid raw water tank, a sludge digestion liquid AO reactor and a sludge digestion liquid secondary sedimentation tank, wherein the municipal sewage secondary sedimentation tank is a radial flow sedimentation tank; and the sludge digestion liquid secondary sedimentation tank is a vertical flow sedimentation tank. The method is as follows: carrying out shortcut nitrification on sludge digestion liquid through inhibition of low dissolved oxygen (DO is 0.5-1mg/L) and free ammonia (FA); and adding the excess sludge in a sludge digestion liquid shortcut nitrification system to a municipal sewage shortcut nitrification system, and simultaneously maintaining the low dissolved oxygen of the system (DO is 0.3-0.8mg/L), thereby stably achieving the efficient shortcut nitrification of the municipal sewage. By using the method, the shortcut nitrification and denitrification can be achieved, aeration energy consumption is saved, carbon source requirement for denitrification is reduced, sludge yield is reduced, and simultaneously, the volume load of the municipal sewage shortcut nitrification system is improved and the shock resistance capability of the system is enhanced.

The invention discloses an energy-saving and consumption-reducing shortcut nitrification-denitrification phosphorus removal technology. An anaerobic reactor, a first anoxic reactor, a first aerobic reactor, a second anoxic reactor and a second aerobic reactor are sequentially connected with one another; activated sludge from a secondary sedimentation tank of a municipal sewage is inoculated to each reactor; a part of raw water enters the anaerobic reactor, and the other part of the raw water directly enters the first aerobic reactor through a water feed pump; and a part of an effluent of the anaerobic reactor directly enters the first anoxic reactor, and the other part of the effluent is shunted to the first aerobic reactor through a metering pump, wherein the DO of the first aerobic reactor is controlled to be 0.5-1.0mg/L, the pH value is controlled to be 8.0, and the DO of the second aerobic reactor is controlled to be 0.3-0.5mg/L. By adopting the energy-saving and consumption-reducing shortcut nitrification-denitrification phosphorus removal technology provided by the invention, under the normal-temperature low dissolved oxygen condition, stable accumulation of nitrite is realized and synchronously removal of phosphorus with denitrification is realized; and in the premise of ensuring the quality of the effluent, the sewage treatment efficiency is greatly improved.

The invention discloses a device and a method for realizing short-cut nitrification coupled anaerobic ammonia oxidation denitrification in a sewage treatment continuous flow process through a sludge fermentation product, and belongs to the field of sewage treatment. The device mainly comprises a sewage raw water tank, a sludge fermentation product storage tank, a sewage treatment continuous flow reactor and a sedimentation tank. The sewage treatment continuous flow reactor in the method comprises continuous flow reactors in all forms in sewage treatment, and mainly inhibits the activity of NOBthrough the sludge fermentation product, so that an aerobic section in the continuous flow is subjected to a short-cut nitrification reaction. The method is simple and feasible, can solve the problemthat short-cut nitrification of a continuous flow process is difficult to realize, can provide nitrite nitrogen for denitrification and anaerobic ammonia oxidation, and achieves the purposes of saving energy and reducing consumption.

The invention relates to a device and method for realizing synchronous short-range nitrification and denitrification phosphorus removal under the condition of intermittent aeration by using sludge fermented matter, belonging to the field of urban sewage treatment and sludge biochemical treatment. Synchronous short-cut nitrification and denitrification phosphorus removal is carried out in the SBR reactor, and the remaining sludge is discharged into the side closed reactor for anaerobic fermentation, and then the fermented product and domestic sewage are mixed and pumped into the SBR reactor through a peristaltic pump. Anaerobic phosphobacteria (PAOs and DPAOs), polysaccharide bacteria (GAOs) and denitrifying polysaccharide bacteria (DGAOs) can store and utilize easily degradable carbon sources produced during sludge fermentation in a timely manner, followed by intermittent aeration to achieve degradable carbon sources. Nitrogen and phosphorus removal. At the same time, the inhibition degree of the fermentation product to nitrite oxidizing bacteria (NOB) is stronger than that of ammonia oxidizing bacteria (AOB), so as to achieve the purpose of elutriating NOB. This process is suitable for the deep denitrification and dephosphorization of domestic sewage with low C/N and low C/P, and at the same time can realize the reduction of excess sludge and resource utilization.