Sewage treatment system and method based on sludge carbon source and nitrogen and phosphorus recycling

Abstract

The invention provides a sewage treatment system and method based on a sludge carbon source and nitrogen and phosphorus recycling, aiming at the problems of low resource utilization efficiency, single manner and the like of residual sludge in conventional sewage plants. The sewage treatment system consists of a mainstream sewage treatment system having a phosphorus and nitrogen removal function and a bypass mud resource utilization system, wherein the mainstream sewage treatment system consists of a settling tank, a biological phosphorus and nitrogen removal tank and a secondary sedimentation tank; the bypass system consists of a sludge carbon source tank, a sludge elutriating and settling tank, and a nitrogen and phosphorus recovery tank. According to the sewage treatment system and method, residual sludge is transformed into dissolved-state easily-degradable carbon source substances (such as VFAs) through strengthened hydrolytic acidification, and the dissolved-state easily-degradable carbon source substances reflow into the biological phosphorus and nitrogen removal tank as supplementary carbon sources, so that the aims of increasing the biological phosphorus and nitrogen removal efficiency and reducing sludge are fulfilled; moreover, low-cost recovery of nitrogen and phosphorus in sludge is realized in a bypass through a chemical precipitation way.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and sludge resource utilization, and relates to a sewage treatment system and method based on sludge carbon source and nitrogen and phosphorus recycling. Background technique [0002] Nitrogen and phosphorus are the main elements that cause "eutrophication" of water bodies. In order to prevent "eutrophication" of water bodies, sewage treatment plants are required to remove nitrogen and phosphorus in sewage while removing organic matter in sewage. In the sewage treatment process, part of the nitrogen is converted into nitrogen gas discharge, and the other part is transferred to the excess sludge, while most of the phosphorus is transferred to the excess sludge. Most of these nitrogen and phosphorus have not been utilized as resources due to the treatment and disposal of excess sludge. Caused a serious waste of resources. [0003] On the other hand, in recent years, with the increasing ...

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Problems solved by technology

At present, the cost of sludge treatment and disposal has ac

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