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.
Research Advance in Extracellular Polymeric Substances of Activated Sludge as In-situ Carbon Source
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第16期
Page:
8-13
Column:
Date of publication:
2023-08-17
- Keywords:
- activated sludge; extracellular polymeric substances; biodegradability of EPS; in-situ carbon source; biological denitrification
- 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.
Last Update:
2023-08-17