Degradation of Extracellular Polymeric Substances (EPS) in Anaerobic Digestion of Dewatered Sludge

• DOI: 10.1016/j.proenv.2013.04.069
• Publication Date: 2013-06-06T13:55:52Z
• Authors: Xiaohu Dai; Fan Luo; Lingling Dai; Bin Dong
• Keywords: Degradation; Anaerobic digestion; Extracellular polymeric substances (EPS); 0211 other engineering and technologies; 02 engineering and technology; 7. Clean energy; 6. Clean water; High solid

AbstractThe degradation of extracellular polymeric substances based on high-solid anaerobic digestion was investigated by gel filtration chromatography (GFC) and three-dimensional excitation and emission matrix (EEM) The organic matters of Extracellular Polymeric Substances (EPS) in the sludge decreased 24% and shifted from the tightly bound EPS (TB-EPS) fraction to the Slime fraction during anaerobic digestion. The raw sludge and the digestate had opposite molecular weights (MW) distribution in EPS fractions. From the fluorescence spectra result, tyrosine-like substances were converted to tryptophan-like substances, and more humic-like substance in Slime fration was produced with the reduction of the protein-like substance during anaerobic digestion.