Optimized carbon source utilization sewage treatment system to reduce the re-oxygenation effect of pretreatment system

Abstract

The invention relates to a sewage treatment system capable of optimizing carbon source utilization to reduce a reoxygenation effect of a pretreatment system. The sewage treatment system comprises a pretreatment system and a biological treatment system, wherein the pretreatment system comprises a coarse grating, a water inlet pump room, a fine grating, an aerated grit chamber and a primary settling tank, which are sequentially connected with each other; a dual-layer cap is arranged above the pretreatment system and is connected with a deodorization system through a pipeline; the biological treatment system comprises a pre-anoxic tank, an anaerobic tank, an anoxia tank, an aerobic tank and a secondary sedimentation tank, which are sequentially connected with each other; and a single-layer cover is arranged above the pre-anoxic tank, the anaerobic tank and the anoxia tank, is connected with an aerated grit chamber aerating system through a pipeline, and is supplied to the aerated grit chamber to aerate. The aerating source of the dual-layer cap and the aerated grit chamber of the pretreatment system disclosed by the invention is selected from a low-oxygen content gas of the capped biological system; the sewage reoxygenation effect of the pretreatment system can be reduced; the consumption of a water inlet carbon source in the pretreatment system is reasonably controlled; and the effective utilization rate of the water inlet carbon source is improved.

Description

technical field [0001] The invention relates to an optimized carbon source utilization sewage treatment system that reduces the reoxygenation effect of a pretreatment system, and belongs to the technical field of sewage treatment. Background technique [0002] According to statistics, as of August 2013, my country has built 3,478 urban sewage treatment plants with a total treatment capacity of 146 million m3 / d, including 813 urban sewage treatment plants that implement Class I A discharge standards, with a scale of 26.19 million m3 / d. A large number of sewage plants release a large amount of toxic and harmful gases during the process of reducing pollutants, especially the sewage in the pretreatment stage contains a large amount of toxic and harmful gases such as hydrogen sulfide and ammonia nitrogen produced by the sewage pipe network and pretreatment structures. . At present, the deodorization system has been gradually set up and perfected in the renovation of new sewage pla...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of carbon source consumption of sewage such as falling water reoxygenation in the pretreatment section of the sewage treatment process and reoxygenation in the aeration grit chamber, and provides a pretreatment system with double-layer cover and aeration grit chamber Pool gas source comes from pre-anoxic pool, anaerobic pool and anoxic pool. Single-layer cover lower gas reduces pretreatment system reoxygenation effect. Optimizes carbon source utilization. Sewage treatment system

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