“…Extracellular polymeric substances (EPS) are high molecular weight compounds secreted by microorganisms into their environment (Sheng et al, 2010) and include proteins, polysaccharides, humic substances, deoxyribonucleic acids (DNA), lipids, and uronic acid Liu and Fang, 2002;Sheng et al, 2010;d'Abzac et al, 2010). EPS, an important composition of activated sludge Nielsen et al, 1996), plays an important role in biological wastewater treatment (Wilen et al, 2003;Neyens et al, 2004;Wang et al, 2005;Long et al, 2009).…”