Anaerobic-aerobic process control method for efficient phosphorus removal and nitrogen reservation of municipal domestic sewage

Abstract

An anaerobic-aerobic process control method for the efficient phosphorus removal and nitrogen reservation of municipal domestic sewage belongs to the municipal domestic sewage processing and recycling fields. A complete sewage regeneration flow represented by using anaerobic-aerobic processes to remove phosphorus and organic matters and using an autotrophic nitrogen removal technology to remove nitrogen is an effective approach for realizing the low-carbon and high-efficiency processing of the sewage; and the subsequent autotrophic nitrogen removal technology has no phosphorus removal function and treats ammonia nitrogen as inlet water, so the total phosphorus content of the outlet water of the anaerobic-aerobic process in the complete flow is less than 0.5mg / L and reaches a first order A standard, and nitrogen reservation, no conversion and low loss are reached. The anaerobic-aerobic process efficient phosphorus removal and low nitrogen operation is realized through treating the domestic sewage as base water, carrying out gradient oxygen limitation, strictly controlling the sludge age and inhibiting ammoxidation and denitrification through providing the anaerobic-aerobic process control parameters at different temperatures under a normal temperature condition.

Description

technical field [0001] The invention belongs to the field of urban domestic sewage treatment and resource utilization, and in particular relates to an anaerobic-aerobic process control method for highly efficient phosphorus removal and nitrogen retention. Background technique [0002] Up-to-standard discharge of sewage treatment is an important means to alleviate the crisis of water environment. my country's sewage treatment plants mainly use the following three treatment processes: A 2 / O activated sludge process, oxidation ditch and SBR. A 2 The expected goal of the / O process is to remove both N and P in biological depth while removing organic pollution. However, the actual operation experience shows that since both denitrification and biological phosphorus removal need to consume carbon sources, there is a problem of competition for carbon sources. Moreover, there are differences in dissolved oxygen and sludge age between phosphorus removal bacteria and denitrificatio...

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Problems solved by technology

[0005] However, when the traditional A / O phosphorus removal process is running, it does not regulate nitrogen, and often the loss of ammonia nitrogen exceeds 50%, and the loss of total nitrogen exceeds 40%, which is extremely unfavorable to the subsequent autotrophic denitrification process, and there is a large amount of denitrification. Competing with phosphorus-accumulating bacteria in the anaerobic zone for carbon sources, reducing the phosphorus removal efficiency. Generally, when the traditional A / O process is running, the phosphorus removal rate is maintained at about 80%, and it is difficult to further improve

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