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

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 method for realizing shortcut nitration of high ammonia nitrogen wastewater. The method comprises the following steps of: culturing nitrosation dominant flora; and performing ammonia sewage treatment by using the flora as an inoculum, namely adding the cultured nitrosation dominant flora into an aeration reactor to treat the ammonia wastewater, wherein the adding amount of the cultured nitrosation dominant flora accords with a condition that: sludge concentration is 800-2,000mg / L after the cultured nitrosation dominant flora is added; and the treatment conditions arethat: the temperature is 18-40DEG C, the dissolved oxygen is 0.1-3mg / L, and the pH is 7- 9. The unique nitrosation dominant flora culture method is adopted, stable and high-efficiency ammonia nitrogen wastewater treatment effect can be achieved, and the problem of instability of the shortcut nitration in actual application is solved.

The invention discloses a set of device and method capable of quickly constructing and maintaining short-range denitrification biological treatment of high-salt wastewater. A biological sequencing batch reactor (SBR) is used as a main body in the device, and the device runs in an intermittent manner. The method for the short-range denitrification biological treatment of the high salt wastewater comprises the steps: the collected bottom sludge from a river or sea port is inoculated in the device, and a halophilic short-range denitrification biological treatment system can be quickly constructed after domestic sewage with salt content of 2.8 to 3.3 percent is used as raw water for continuous operation for 20 to 40 cycles. The constructed halophilic short-range denitrification system can stably and efficiently treat the high-salt wastewater with salt content of 2 to 10 percent. The biological denitrification treatment of the high-salt wastewater can be realized under the condition that desalting and salinity dilution are not performed. The problem that a fresh water microbial salinity acclimation method seriously restricts the engineering application due to long starting period, instability and the like is solved. Meanwhile, because stable short-range denitrification is realized, the treatment cost is further reduced; and on the premise of ensuring the quality safety and the stability of the yielding water, the treatment efficiency is improved, and operating energy consumption and expense are decreased.

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.

A device and method for realizing short-range nitrification-ANAMMOX based on hydroxylamine side inhibition, which belongs to the field of urban sewage treatment, realizes short-range nitrification by using hydroxylamine to inhibit nitrite oxidizing bacteria (NOB), thereby providing for subsequent anaerobic Ammonia oxidation provides stable nitrite. Hydroxylamine, as the key intermediate product of nitrification reaction, plays an important role in the balance of the whole nitrification process. Appropriate dosage can increase the cell productivity of ammonia oxidizing bacteria (AOB) and inhibit the activity of NOB, so as to achieve a stable short-term nitrification. However, hydroxylamine is also toxic, and excessive dosage will cause the inactivation of AOB and NOB at the same time. Therefore, this patent treats sludge by the side of hydroxylamine, which can control the problem of excess. At the same time, it can start short-range nitrification quickly and maintain a high accumulation of nitrous. The method is simple to operate, and solves the problem that it is difficult to maintain stable nitrite in urban sewage by the short-range nitrification-ANAMMOX process.

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.