Contribution of bacterial extracellular polymeric substances (EPS) in surface water purification

Naturally present aquatic microorganisms play an important role in water purification systems, such as the self-purification of surface waters. In this study, two sources representing polluted (Olympic Green; OG) and unpolluted (Jingmi river; JM), were used to explore by bacteria under different environmental conditions. The dominant bacterial community OG JM waters (both are Firmicutes Proteobacteria) isolated, cultured, then carry out flocculation tests. Results showed that ability extracellular polymeric substances (EPS) obtained from isolation was significantly greater than JM. Further examination illustrated main components EPS polysaccharides, which played improving bacteria. cultural strains (OG1 JM3) isolated lacked hydrophilic groups (e.g. COOH) had a networked structure reasons enhance ability. diversity redundancy analysis (RDA) results also microbial composition is determined quality (SS, TOC, NH4+), Bacteroidetes, Actinobacteria Proteobacteria structures can improve body’s remove pollutants (such SS, humic acid fulvic acid). These findings provide new information showing how communities change with factors while maintaining purity water.