Biopolymers Production by Mixed Culture and Their Applications in Water and Wastewater Treatment. (1st June 2015)

• Record Type: Journal Article
• Authors: More, Tanaji T.; Yan, Song; Tyagi, Rajeshwar Dayal; Surampalli, Rao Y.
• Is Part Of: Water environment research. Volume 87:Number 6(2015)
• Page Start: 533
• Page End: 546
• Publication Date: 2015-06-01
• Subjects: biopolymers -- bioflocculants -- EPS -- flocculation -- mixed culture -- wastewater sludge -- wastewater treatment -- water treatment; Water quality management -- Periodicals; Water -- Purification -- Periodicals; Water -- Pollution -- Periodicals; Water -- Pollution; Water -- Purification; Water quality management; Sewage; Water Pollution; Periodicals; Electronic journals; Periodicals; 628.16
• DOI: 10.2175/106143015X14212658614676
• Languages: English
• ISSNs: 1061-4303

Abstract

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 Ca 2+ . 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.