Sequencing batch reaction device and method for carrying out dephosphorization and partial nitrification on low-carbon urban sewage in single-sludge system

Abstract

The invention relates to a sequencing batch reaction device and method for carrying out dephosphorization and partial nitrification on low-carbon urban sewage in a single-sludge system and belongs to the fields of urban sewage treatment and resource regeneration. The device comprises a sequencing batch reactor, a stirring mill and an aerator. The device comprises the following steps: controlling the sludge age, selectively discharging sewage, maintaining the low dissolved oxygen, carrying out time-controlled semi-nitrosation, preserving phosphorus-accumulating bacteria, inhibiting nitrite-oxidizing bacteria, enriching ammonia oxidizing bacteria, rapidly starting a microorganism system led by the phosphorus-accumulating bacteria and the ammonia oxidizing bacteria, and optimizing a microenvironment in which the phosphorus-accumulating bacteria and the ammonia oxidizing bacteria coexist, so as to enable the contents of water and phosphorus to reach a first-stage standard A, wherein the specific value of nitrite nitrogen to ammonia nitrogen is about 1:1; after carrying out precipitation and water discharging, creatively carrying out anaerobic stirring on the precipitated sewage, and restoring the residual nitrite nitrogen into nitrogen by virtue of endogenous denitrification. According to the device and the method, the problem that the phosphorus-accumulating bacteria and the ammonia oxidizing bacteria cannot harmoniously coexist in a single sewage system is solved, and a novel thought is provided for dephosphorization and autotrophic nitrogen removal processes.

Description

technical field [0001] The invention belongs to the field of urban domestic sewage treatment and regeneration. Specifically, by improving the control means of the process, enriching phosphorus accumulating bacteria and ammonia oxidizing bacteria at the same time, so as to achieve the purpose of simultaneous phosphorus removal and short-range nitrification in a single sludge system, and provide new ideas for biological phosphorus removal and autotrophic nitrogen removal. Background technique [0002] With the growth of economic level and the intensification of human activities, water pollution is becoming more and more serious, among which phosphorus and nitrogen pollution is a major hazard, which has a great impact on the natural environment and human health. At present, for the removal of phosphorus and nitrogen, urban sewage treatment plants mostly adopt the denitrification process based on the principle of traditional enhanced biological phosphorus removal and nitrificati...

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Problems solved by technology

[0005] However, the direct coupling process of "enhanced biological phosphorus removal + short-range nitrification + anammox" still has its unavoidable defects

First of all, in the stage of enhanced biological phosphorus removal, it is easy to release phosphorus twice during the precipitation process, so it is difficult for biological phosphorus removal to meet the national first-level A standard (P≤0.5mg / L); secondly, the stability of short-cut nitrification is not easy to control

Excessive aeration, too short sludge age, and delayed aeration may cause damage to short-range nitrification; finally, the direct coupling process of "enhanced biological phosphorus removal + short-range nitrification + anaerobic ammonium oxidation", its infrastructure The investment is relatively high, and the structure is complicated, and the processing process is lengthy

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