4.5 Article

Optimization for extracellular polymeric substances extraction of microbial aggregates

期刊

WATER SCIENCE AND TECHNOLOGY
卷 71, 期 7, 页码 1106-1112

出版社

IWA PUBLISHING
DOI: 10.2166/wst.2015.043

关键词

extracellular polymeric substances (EPS); extraction method; microbial aggregate; three-dimensional fluorescence spectrum technology

资金

  1. National Natural Science Foundation of China [51478416, 51008269]
  2. Natural Science Foundation of Zhejiang province [LY13E080003]
  3. Zhejiang province [2014C33017]
  4. Fundamental Research Funds for the Central Universities

向作者/读者索取更多资源

The extracellular polymeric substances (EPS) are important macromolecular components in microbial aggregates. The three EPS extraction methods - ultrasound + cation exchange resins (CER) + sulfide, ultrasound + formamide + NaOH, and ultrasound + heat - were investigated in the study, and the component differences of extracted EPS from the loose flocs and dense aerobic granules were compared using chemical analysis and three-dimensional excitation-emission matrix (3D-EEM). Results showed that the contents of EPS were extracted effectively by ultrasound + formamide + NaOH and ultrasound + heat methods, and the ultrasound + CER + sulfide method did not extract the polysaccharides (PS) or protein (PN) contents from the sludge samples. The 3D-EEM analysis indicated that the nature of peak B/D, peak C/E/F, and peak A/G were attributed to PN-like, humic acid-like and fulvic acid-like fluorophores. All fluorophores can be detected from the EPS extracted through the ultrasound + heat method. Hopefully this will provide more information about the EPS interaction mechanism of microbial aggregates.

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