title: Biopolymers Production by Mixed Culture and Their Applications in Water and Wastewater Treatment.
abstract: Thirteen extracellular polymeric substances (EPS) producing bacterial strains were cultivated (as pure/mixed culture) in sterilized sludge (suspended solids: 25 g/L). The mixed culture produced higher concentrations of EPS (4.9 g/L) as compared to that of the pure culture (2.7-3.7 g/L). The harvested EPS were examined for their flocculation performance (turbidity removal and dewatering) in jar tests using kaolin suspensions with Ca2+. Broth (B-EPS) revealed high kaolin flocculating activity (91.2%) at very low concentrations (0.8 mg B-EPS/g kaolin) and it was comparable to the chemical polymer, Magnafloc-155 (90.4% at 0.2 mg/g kaolin). B-EPS also exhibited very good flocculation performance (turbidity removal %) in river water (93.5%), municipal wastewater (91.7%) and brewery wastewater (81.8%). The study revealed that the mixed culture consortium could be used for the production of highly efficient flocculants.
authors.affiliation: Institut National de la Recherche Scientifique, Centre Eau, Terre et, Environnement, Université du Québec, 490 de la Couronne, Québec (QC), G1K 9A9, Canada.
authors.forename: Tanaji T
authors.initials: TT
authors.lastname: More
authors.forename: Song
authors.initials: S
authors.lastname: Yan
authors.forename: Rajeshwar Dayal
authors.initials: RD
authors.lastname: Tyagi
authors.forename: Rao Y
authors.initials: RY
authors.lastname: Surampalli
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001704:Biopolymers / Q000096:biosynthesis* / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D012722:Sewage; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D001704:Biopolymers; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical