title: Biopolymer Production Kinetics of Mixed Culture Using Wastewater Sludge as a Raw Material and the Effect of Different Cations on Biopolymer Applications in Water and Wastewater Treatment.
abstract: Thirteen extracellular polymeric substances (EPS) producing bacterial strains were cultivated (as mixed culture) in the sterilized sludge (suspended solids of 25 g/L) and the batch fermentation was carried out. Mixed culture revealed a high specific growth rate of 0.35/hr. The EPS production rate was higher up to 24 hours, which gradually decreased with further incubation. The kinetic estimates demonstrated growth-associated EPS production. Broth EPS revealed higher flocculation activity when combined with different cations (Ca(2+), Mg(2+), Fe(3+), and Al(3+)) in river water (≥90%), municipal wastewater (≥90%), and brewery wastewater (≥80%), respectively. A low dose (5 to 40 mg/L) of trivalent cations was required to achieve higher flocculation compared to the divalent cations (50 to 250 mg/L). Flocculation performance of EPS was comparable to Magnafloc-155 (chemical polymer) and, hence, it could be used as a flocculant.
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: T T
authors.initials: TT
authors.lastname: More
authors.forename: S
authors.initials: S
authors.lastname: Yan
authors.forename: R D
authors.initials: RD
authors.lastname: Tyagi
authors.forename: R Y
authors.initials: RY
authors.lastname: Surampalli
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001704:Biopolymers / Q000378:metabolism*; D019149:Bioreactors; D002412:Cations / Q000032:analysis; D005427:Flocculation; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D001704:Biopolymers; D002412:Cations; D012722:Sewage; D062065:Wastewater