A method based on pulse aeration to strengthen sewage nitrogen and phosphorus removal and energy saving and consumption reduction

Abstract

The invention is a method based on pulse aeration to strengthen the denitrification and dephosphorization of sewage and to save energy and reduce consumption. On the basis of the traditional A2O process, the different corridors or areas of the aerobic zone are divided into partitions, and the aeration system is controlled by the central control system of the sewage treatment plant to control the fans, pipelines and air valves of the aeration system, and pulse aeration is performed on the aerobic zone. so that one area in the aerobic zone is always in a state of low dissolved oxygen, DO<0.5mg / L, while other areas are in a state of high dissolved oxygen DO2‑3mg / L with normal aeration, and different areas in the aerobic zone are alternately in low Dissolved oxygen state, the time each area is in a low dissolved oxygen state within a cycle is t / n, t is the hydraulic retention time in the aerobic area, n is the number of corridors or areas in the aerobic area, and the pulse period is the hydraulic retention time in the aerobic area. Residence time, after intermittent pulse aeration in the aerobic zone, an alternate anoxic and aerobic environment can be realized, denitrification can be strengthened, and the sewage treatment effect and water quality can be improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for strengthening sewage denitrification and dephosphorization and energy saving and consumption reduction based on pulse aeration. Background technique [0002] Nitrogen and phosphorus in discharged sewage are important nutrients that cause eutrophication of water bodies. With the increasingly serious problem of eutrophication in my country's water bodies and the implementation of the new "Pollutant Discharge Standards for Urban Sewage Plants" (GB18918-2002), the development of economical, efficient and stable sewage nitrogen and phosphorus removal technologies has become an urgent need in the field of water treatment. Technical requirements. At the same time, the high energy consumption of sewage treatment plants is the main source of investment costs for their operation; aeration and oxygen supply are the main consumers of energy consumption, so reducing the ...

AI Technical Summary

Problems solved by technology

Continue to increase the reflux ratio, the total nitrogen removal rate will not increase significantly, and the dissolved oxygen from the aerobic tank into the anoxic tank will increase, thereby consuming the organic carbon source in the influent and affecting the efficiency of denitrification and denitrification

[0004] At present, pulse aeration is mainly used to control membrane fouling in membrane bioreactors, and there are no studies and reports on aeration control in sewage treatment plants.

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