摘要：

以采用倒置A²/O（缺氧-厌氧-好氧）工艺的重庆ST污水处理厂为对象，通过持续取样分析以及内部过程核算，分析了污水处理厂进水中碳源的流向。结果表明，在该污水处理厂中，生化池输入的BOD总量约为99.0 mg/L（含进水碳源以及外加碳源），其中46.1 mg/L BOD被用于反硝化脱氮，占BOD输入总量的47%，厌氧池中磷的释放消耗7.44 mg/L BOD，占BOD输入总量的7%，缺氧/厌氧池中微生物因同化作用消耗的BOD占输入总量的24%，好氧阶段氧化反应消耗的BOD占输入总量的22%。在以上碳源消耗路径中，反硝化脱氮对碳源的需求不可或缺，缺氧/厌氧阶段的同化作用耗碳不可避免，而厌氧释磷耗碳和好氧反应耗碳过程则可在实际工程应用中通过运行优化予以削减甚至避免，这为后续外碳源的减量方向提供了依据。

关键词: 污水处理厂, 碳流向, 外碳源减量

Abstract:

Taking the Chongqing ST sewage treatment plant using the inverted A²/O (anoxic-anaerobic-aerobic) process as the object, the flow direction of carbon sources in influent of the sewage treatment plant was analyzed through continuous sampling analysis and internal process accounting. The results showed that in this sewage treatment plant, the total input BOD in the biochemical tank was approximately 99.0 mg/L (including influent carbon sources and additional carbon sources), of which 46.1 mg/L BOD was used for denitrification, accounting for 47% of the total BOD input. The release of phosphorus in the anaerobic tank consumed 7.44 mg/L BOD, accounting for 7% of the total input. Microorganisms in the anoxic/anaerobic tank consumed 24% of the total input BOD due to assimilation, while aerobic stage consumed 22% of the total input BOD. Among the carbon sources consumed above, the demand for carbon sources by denitrification was indispensable, and the carbon consumption due to assimilation in the anaerobic/anoxic stage was unavoidable, while carbon consumption during anaerobic phosphorus release and aerobic oxidation processes could be reduced or even avoided through operational optimization in practical engineering. This provided a basis for reducing the amount of external carbon sources in subsequent directions.

Key words: wastewater treatment plant, carbon flow direction, reduction of external carbon sources

中图分类号: 

• X703.1