Method for starting total biological phosphorus removal AOO process

Abstract

The invention provides a method for starting a total biological phosphorus removal AOO process. The method comprises the following steps: 1, starting a domestication and enrichment stage before start,comprising (1) anaerobic contact of sludge; (2) high-aeration aerobic domestication of sludge; and (3) sludge amount enlargement and optimum aeration amount search; and 2, starting stage, namely (1)entering a reactor, and respectively setting an anaerobic zone, an aerobic first zone, an aerobic middle zone and an aerobic tail zone, wherein the hydraulic retention time in the anaerobic zone is consistent with that of the traditional AO process; and (2) controlling the dissolved oxygen concentration to be 0.3-0.7mg / L and the hydraulic retention time to be 0.7-1 hour at the aerobic first zone,controlling the dissolved oxygen concentration to be 1.0-1.6mg / L and the hydraulic retention time to be 1.5-2 hours at the aerobic middle zone and the aerobic tail zone, controlling the sludge age tobe 5-7 days, and controlling the reflux ratio to be 50-60%. The method disclosed by the invention is rapid in system startup and high in starting success rate, the operation is stable, and the aeration amount is saved.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and resource utilization, and relates to a start-up method of an all-biological phosphorus removal AOO process. Background technique [0002] Nitrogen and phosphorus are the main factors causing lake eutrophication. At present, the main goal of sewage treatment in my country is still COD, and insufficient attention has been paid to the removal of nitrogen and phosphorus. The concentration of ammonia nitrogen in the actual domestic sewage of the community is 50-70mg / L, and the concentration of phosphorus is 6 ~7mg / L, due to the different sludge ages of nitrifying bacteria and aerobic phosphorus accumulating bacteria, limited COD in sewage and other reasons, the removal of nitrogen and phosphorus cannot be taken into account. Sewage plants usually adopt biological denitrification, and phosphorus removal is a biological + chemical auxiliary method, which increases the cost of sewage treatment, an...

AI Technical Summary

Problems solved by technology

[0007] 2) The system is difficult to run stably under low load;

[0009] Under the condition of low load of 0.5CODg / g, the sludge of AO continuous flow biological phosphorus removal process is easy to expand and difficult to stabilize

[0010] 3) The system cannot start and operate at low temperature;

Under normal temperature from April to October, the anaerobic and aerobic AO continuous flow biological phosphorus removal reactor often has sludge bulking after running for about 3 months due to the low load and the accumulation of Thiobacillus, which is difficult to stabilize

[0015] 2) Double sludge anaerobic anoxic phosphorus removal-anaerobic aerobic nitrogen removal A 2 N continuous flow dual-sludge system, the process procedure is complex, need to be started separately and recombined, the ratio of influent nitrogen and phosphorus is relatively strict, and auxiliary chemical phosphorus removal is required;

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