Method for generating and utilizing N2O in partial nitrifying process of sludge digestion solution

Abstract

The invention discloses a method for generating and utilizing N2O in a partial nitrifying process of a sludge digestion solution. A device used by the method comprises a sludge nitrifying solution tank, a water inlet pump, a partial nitrifying N2O producing reactor, and the like, wherein the partial nitrifying N2O producing reactor is a sealed SBR (Sequencing Batch Reactor), and is provided with a sealing cover, an N2O collecting pipe, an exposure head, a DO (Dissolved Oxygen) probe and a pH probe. The method comprises the steps: regulating and controlling operating conditions through inoculating partial nitrifying particular sludge to enhance accumulation of N2O in the partial nitrifying process of the sludge digestion solution; then collecting a gas at the upper of the reactor as an oxidant of methane combustion, so that the yield is increased. According to the method, the release amount of N2O in the partial nitrifying process of the sludge digestion solution can be reduced, and the yield of a sewage plant can be increased.

Description

technical field [0001] The invention relates to a method for realizing the short-range nitrification process of sludge digestion liquid 2 The method for generating and utilizing O belongs to the technical field of sewage biological treatment. Background technique [0002] At present, in order to reduce the treatment cost of high ammonia nitrogen wastewater such as sludge digestate (300-1000mg / L), it is usually treated by short-range nitrification and denitrification or short-range nitrification-anammox process. Short-cut nitrification has the following advantages: (1) Compared with nitrite oxidizing bacteria (NOB), ammonia oxidizing bacteria (AOB) has a shorter generation cycle, which can reduce the reactor volume and save capital investment. It can be reduced by 30% to 40%; (2) The oxygen demand in the nitrification stage can be reduced by 25%, saving aeration costs; (3) The carbon source required in the denitrification stage is reduced by 40%, and the denitrification rate...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is to solve the problem of greenhouse gas N in the short-range nitrification process of the above-mentioned sludge digestion 2 O release problem, a proposed method to realize the short-cut nitrification process of sludge digestion liquid 2 O production and utilization methods

The present invention changes the traditional N 2 The idea of ​​O control and emission reduction, from the enhanced denitrification process of N 2 The production of O to start with, and then used for the oxidation of methane to produce N 2 , thus inversely solving N 2 The problem of O emission; at the same time, it also improves the energy generated by the methane combustion power generation process of the sewage plant

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