WANGXian-bao,ZHANGYu-di,ZHANGMin-ting,et al.Research Advance in Extracellular Polymeric Substances of Activated Sludge as In-situ Carbon Source[J].China Water & Wastewater,2023,39(16):8-13.
活性污泥胞外聚合物原位碳源化技术研究进展
- Title:
- Research Advance in Extracellular Polymeric Substances of Activated Sludge as In-situ Carbon Source
- Keywords:
- activated sludge; extracellular polymeric substances; biodegradability of EPS; in-situ carbon source; biological denitrification
- 摘要:
- 我国城镇污水处理厂普遍存在进水碳氮比低的问题，碳源不足直接影响生物系统脱氮除磷效果。随着我国污水处理厂出水排放标准的提高，对生物系统脱氮除磷提出了更高的要求，碳源不足的问题越发突出。胞外聚合物（EPS）是活性污泥的重要组成部分，其中含有大量蛋白质与多糖等有机物。EPS剥离可作为生物脱氮的补充碳源，是解决污水处理厂碳源不足的有效途径。在活性污泥EPS组分与结构解析的基础上，对EPS可生物降解性的研究进行了总结，论述了EPS剥离释碳对污泥生物代谢活性的影响，重点分析了EPS原位释碳模式及原位碳源化对生物脱氮性能的影响，并指出今后的研究方向，以提高EPS碳源在反硝化过程中的利用。
- Abstract:
- Low ratio of carbon to nitrogen in wastewater is a common problem in urban sewage treatment plants in China, which affects the process of nitrogen and phosphorus removal in biological systems. The effluent discharge standards of urban sewage treatment plants in China are becoming stricter, which requires further improvement of nitrogen and phosphorus removal efficiency in biological systems. Therefore, insufficient carbon sources have become a prominent issue. Extracellular polymeric substances (EPS) is the important component of activated sludge, which contains a lot of proteins, polysaccharides and other organic matter. It is an effective way by using EPS exfoliation from activated sludge as the supplementary carbon source for biological nitrogen removal to solve the problem of insufficient carbon sources in sewage treatment plants. Based on the analysis of EPS components and structure in activated sludge, the research on the biodegradability of EPS was summarized. The effect of carbon release by EPS exfoliation on the biological metabolic activity of sludge was discussed. The in-situ carbon release mode of EPS and the effect of in-situ carbon source from EPS on biological denitrification performance were analyzed. Moreover, the future research direction was pointed out to improve the utilization of EPS carbon source in the denitrification process.
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