Stacked biological denitrification sewage treatment technology and device

Abstract

The invention discloses a stacked biological denitrification sewage treatment technology and device. The sewage passes through a primary sedimentation tank and is distributed by a water distribution system to the head ends of anoxic tanks in a stacked system consisting of multiple groups of anoxic tanks and aerobic tanks in cross series connection; the sewage sequentially flows through the anoxic tanks and aerobic tanks, and finally flows into a secondary sedimentation tank from the water outlets of the last group of aerobic tanks; after sludge-water separation in the secondary sedimentation tank, the water is discharged to the water outlets; one part of the sludge flows back to the head ends of the first group of anoxic tanks through a sludge backflow system; and the remaining sludge is discharged to a sludge drying treatment system through a sludge discharge system. Through the invention, an organic carbon source in the raw sludge is sufficiently used, the backflow facility in nitrification liquid and the energy are saved, the tank capacity is reduced, and the capital construction cost is lowered; and moreover, with high denitrification efficiency, the technology and device disclosed by the invention are suitable for the newly-built and rebuilt and expanded high-ammonia nitrogen sewage and municipal sewage treatment projects, and can reduce the sludge scouring caused by peak discharge, enhance the anti-impact load ability of the system, save the capital construction and operation cost and improve the total nitrogen removal efficiency.

Description

technical field [0001] The invention belongs to the technical field of high-ammonia-nitrogen sewage and municipal sewage treatment, and in particular relates to a superimposed biological denitrification sewage treatment process and device. Background technique [0002] With the increasingly stringent sewage discharge standards, sewage treatment facilities need to have efficient denitrification functions. The State Environmental Protection Administration’s “Notice on Strictly Implementing the Pollutant Discharge Standards for Urban Sewage Treatment Plants” proposes that when discharged into national and provincial key river basins and closed waters such as lakes and reservoirs, Class A standards should be implemented. Therefore, in the process of new sewage treatment projects and upgrading of old sewage plants, total nitrogen has become a limiting factor for many sewage treatment plants to meet the discharge standards. [0003] The traditional anoxic / aerobic (A / O) sewage tre...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a superimposed high-efficiency biological denitrification sewage treatment process and device to overcome the problems of high infrastructure and operating costs caused by the large return flow in the traditional sewage treatment process and its improved process, and the need for carbon source addition. , and improve the removal efficiency of total nitrogen in sewage treatment facilities

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