Rapid sludge culture method capable of achieving sewage nitrite accumulation

Abstract

The invention discloses a rapid sludge culture method capable of achieving sewage nitrite accumulation, which includes: (S1) in an aerobiotic nitration section in a sewage treatment plant, collectinga proper amount of active sludge mixed liquid, measuring the mixed liquor suspended solid (MLSS) concentration thereof, abandoning a supernatant, washing the mixed liquid with clear water twice, and diluting or concentrating the liquid according to the MLSS value to maintain the MLSS in 3000-4000 mg / L, and loading a proper amount of the sludge to a reactor; (S2) adding simulative wastewater and comparing the activities of ammonia oxidizing bacteria and nitrate bacteria; (S3) according to a ratio, choosing a proper treatment method, namely, determining whether sludge acclimation is carried outand sulfides, in corresponding concentration, are added or not, and then performing free ammonia treatment in certain concentration. Compared with the prior art, the active sludge treated in the method can hold a high nitrite nitrogen accumulation value within a long time period. The method is good in treatment effect, is not liable to cause activity relapse of the nitrate bacteria (NOB), and hassignificant inhibition effect.

Description

technical field [0001] The invention belongs to the technical field of biological sewage treatment, and in particular relates to a rapid sludge cultivation method for realizing the accumulation of nitrite in sewage. Background technique [0002] Sewage treatment is one of the important issues in the process of environmental governance. With people's attention to energy consumption in the process of sewage treatment, energy-saving sewage treatment methods are becoming more and more popular, such as short-range nitrification and denitrification process. The nitrification process stays in the nitrite stage. On the one hand, it reduces the amount of aeration. On the other hand, the denitrification bacteria directly reduce the nitrite to nitrogen, which reduces the supply of carbon sources. It is an energy-saving sewage treatment process. , especially the combination of short-range nitrification and anammox process, is one of the frontier hotspots in the field of sewage treatment...

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Problems solved by technology

[0002] Sewage treatment is one of the important issues in the process of environmental governance. With people's attention to energy consumption in the process of sewage treatment, energy-saving sewage treatment methods are becoming more and more popular, such as short-range nitrification and denitrification process. The nitrification process stays in the nitrite stage. On the one hand, it reduces the amount of aeration. On the other hand, the denitrification bacteria directly reduce the nitrite to nitrogen, which reduces the supply of carbon sources. It is an energy-saving sewage treatment process. , especially the combination of short-range nitrification and anammox process, is one of the frontier hotspots in the field of sewage treatment. The effective implementation of the short-range nitrification process is the key to ensure the anammox process, but the reaction process of short-range nitrification is difficult Control to ensure that the accumulation of nitrite is the ultimate goal of short-cut nitrification

[0003] Generally, under the condition of sufficient dissolved oxygen, the activity of nitric acid bacteria (NOB) is higher than that of ammonia oxidizing bacteria (AOB), nitrite will be converted into nitrate immediately, and the concentration of nitrite in the effluent is extremely low. The relevant research on nitrate accumulation mainly focuses on controlling the dissolved oxygen and pH of sewage in the reaction system, continuously inhibiting nitrate bacteria, and blocking the conversion of nitrite to nitrate. In addition, in recent years, some substances such as Free ammonia (FA), free nitrous acid (FNA), perchloric acid ClO 4 - , the inhibitory effect of volatile fatty acids (VFA) on nitric acid bacteria (NOB) is significantly stronger than that on ammonia oxidizing bacteria (AOB), so that the accumulation of nitrite nitrogen can be controlled, such as: Chinese patent number: 201010508420.2, Publication date: April 06, 2011, disclosed a method for realizing SBR nitrosation-denitritation at low temperature to control the accumulation of free ammonia. Control the concentration of free ammonia (FA) in the reaction system to inhibit the activity of nitrate bacteria (NOB) and achieve the accumulation of nitrite; A method and device for achieving long-lasting and stable nitrite accumulation under low temperature conditions. By adopting two-stage aeration and adjusting the aeration intensity to domesticate the sludge, the effect of nitrite accumulation is achieved, but such research generally requires more complicated process control, the requirements for processing conditions are relatively strict, and the device is relatively complicated, and the equipment cost is relatively high

At present, there are few reports on the effective accumulation of nitrite formed by the combined treatment of activated sludge by multiple treatment methods.

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