A method, device and application of enhancing biological phosphorus removal in sewage treatment based on vacancy stress

By employing an empty stress tank in wastewater treatment to subject the returned activated sludge to short-term anaerobic idling stress, and utilizing the endogenous fermentation of polysaccharide bacteria to generate carbon sources, the problem of low biological phosphorus removal efficiency under low organic matter concentrations was solved, achieving efficient and low-cost phosphorus removal.

CN122403644APending Publication Date: 2026-07-17SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Filing Date
2026-06-09
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing wastewater treatment technologies have limited efficiency in biological phosphorus removal, especially under conditions of low organic matter concentration and insufficient carbon-nitrogen ratio. Traditional methods such as side-flow enhanced biological phosphorus removal (S2EBPR) suffer from problems such as long retention time, dependence on external carbon sources, difficulty in engineering modification, and inability to selectively inhibit polysaccharide bacteria.

Method used

By adopting strategies of shortening the residence time (2-12 hours) and prohibiting external carbon sources, anaerobic vacancy stress is implemented on the returned activated sludge through an vacancy stress tank. Small molecule organic matter is generated by the endogenous fermentation of polysaccharide bacteria to provide carbon source for polyphosphate-accumulating bacteria, while selectively inhibiting polysaccharide bacteria, thereby realizing the directional transfer of carbon source and the reshaping of carbon flow in the system.

Benefits of technology

It significantly improves phosphorus removal efficiency, eliminates the need for external carbon sources, reduces operating costs, is highly adaptable, and is suitable for urban wastewater treatment under low carbon source and high temperature conditions. It is also easy to modify for engineering purposes and ensures stable and compliant effluent.

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Abstract

本发明属于污水处理技术领域，公开了一种基于空置胁迫的污水处理强化生物除磷方法、设备及应用，该方法包括：S1、将二沉池回流污泥引入空置胁迫池，在严格厌氧等条件下停留2~12小时；S2、将经空置胁迫处理后的污泥送回主流生物处理单元的厌氧池前端；S3、主流生物处理单元运行A2 / O工艺或其变型工艺。本发明利用空置胁迫诱导活性污泥中聚糖菌通过内源发酵产生小分子有机物，为聚磷菌提供易利用碳源，同时选择性抑制聚糖菌。所述设备包括空置胁迫池体、厌氧环境维持单元、在线监测单元及PLC控制系统。本发明具有无需外加碳源、除磷效率高、适应性强、工程造价低、运行成本省等优点，特别适用于低碳源、高温条件下的城镇污水处理厂提标改造。
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Citation Information

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