Single-group B-BAF filter tank device and sewage denitrification treatment method

Abstract

The invention provides a single-group B-BAF filter tank device and a sewage denitrification treatment method, and belongs to the technical field of sewage treatment. The single-group B-BAF filter tank device comprises a water inlet and backwashing air inlet pipe 1, a water distribution chamber 2, a supporting layer 3, a filter material layer 4, a water outlet chamber 5 and a water outlet pipe 6 which are connected in sequence; a return pipe 7, abottom aeration pipe 8 and a middle perforated aeration pipe 9. The return pipe 7 is connected with the water inlet and backwashing air inlet pipe 1 and the water outlet pipe 6; the bottom aeration pipe 8 is arranged in the supporting layer 3; the middle perforated aeration pipe 9 is arranged in the filter material layer 4; and the filter material layer 4 contains bacillus. According to the single-group B-BAF filter tank device provided by the invention, bacillus is introduced, so that a bacillus dominant flora can be formed, anoxic and aerobic heterotrophic denitrification can be carried out, total nitrogen in water is further removed, and the total nitrogen in effluent is ensured to be less than 1.5 mg / L.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a single-group B-BAF filter device and a sewage denitrification treatment method. Background technique [0002] In order to achieve the sustainable development of our society, the country and society have higher and higher requirements for environmental protection, and stricter requirements for the discharge control of pollutants after sewage is treated in sewage treatment plants. At present, more than 95% of domestic sewage treatment plants implement the first-level A discharge standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002). Upgrading and transformation to make the effluent meet higher pollutant discharge requirements. [0003] The most difficult to deal with among the various discharge indicators is the total nitrogen indicator. At present, the effluent in developed areas has implemented the discharge standard of surface w...

AI Technical Summary

Problems solved by technology

If the requirement for total nitrogen emission is further increased to less than 10 mg / L, in addition to the BBR process, it is necessary to add denitrification process technology on the basis of the conventional process. The deep denitrification process is generally at the end of the treatment process, because additional carbon sources are required Dosing, in addition to the total nitrogen index, it is necessary to accurately control the COD of the final effluent, and there is a problem of complex treatment process

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