Biological energizing AAO (anaerobic-anoxic-oxic) sewage treatment process

Abstract

The invention relates to the technical field of sewage treatment, in particular to a biological energizing AAO sewage treatment process which comprises the following steps: S1, enabling incoming sewage and sludge returned in a secondary sedimentation tank to flow in an anaerobic tank from bottom to top through a water distribution device, and forming an activated sludge layer with a hydrolysis function in the anaerobic tank and at the lower layer, the middle layer and the upper layer form a sludge layer with a phosphorus release function; s2, filling materials are added into the anoxic tank, so that denitrifying bacteria are attached to the filling materials, and denitrifying bacteria groups are formed; the denitrification time is prolonged, when the incoming water carbon source is sufficient, denitrifying bacteria are cultured at the front section of the anoxic tank to realize denitrification, and denitrifying phosphorus-philic bacteria are cultured at the middle section and the rear section of the anoxic tank along with the consumption of the carbon source in the water, and are facultative phosphorus-philic bacteria; and S3, adding a filler for immobilizing nitrifying bacteria into the aerobic tank. The phosphorus release process is thorough, the sewage treatment effect is improved, the contradictory relation that nitrogen and phosphorus removal fight for carbon sources is weakened, and the sludge age contradictory problem during nitrogen and phosphorus removal is relieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a biologically energized AAO sewage treatment process. Background technique [0002] The existing municipal sewage treatment plants generally adopt secondary treatment (biochemical treatment), such as figure 1 As shown, the traditional AAO (abbreviation of English Anaerobic-Anoxic-Oxic, anaerobic-anoxic-aerobic method, is a commonly used sewage treatment process) secondary treatment unit is divided into anaerobic pool, anoxic pool , Aerobic pool and secondary sedimentation tank. Sewage incoming water passes through anaerobic tank-anoxic tank-aerobic tank-secondary sedimentation tank in order to remove phosphorus and nitrogen from the sewage. [0003] Under the existing ordinary secondary treatment capacity, the total phosphorus and total nitrogen cannot reach the ideal value, and the effluent quality is not up to standard. The treatment process has the following proble...

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Problems solved by technology

[0003] Under the existing ordinary secondary treatment capacity, the total phosphorus and total nitrogen cannot reach the ideal value, and the effluent quality is not up to standard. The treatment process has the following problems:

[0004] 1. The content of volatile fatty acids in the sewage is limited, and the release of phosphorus in the anaerobic tank is not complete, resulting in the inability to absorb excessive phosphorus in the aerobic tank, and it is necessary to add chemical agents to assist in phosphorus removal;

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