Bacterial polymer production using pre-treated sludge as raw material and its flocculation and dewatering potential.

Abstract

Sterilization, alkaline-thermal and acid-thermal treatments were applied to different sludge solids concentrations (17.0; 22.4; 29.8; 37.3; 44.8 g/L, respectively) and the pre-treated sludge was used as raw material for Serratia sp.1 to produce extracellular polymeric substances (EPS). After 72 h of fermentation, total EPS of 2.3 and 3.4 g/L were produced in sterilized and alkaline-thermal treated sludge as compared to that of 1.5 g/L in acid-thermal treated sludge. Lower EPS were produced at relatively higher solids concentrations (37.3; 44.8 g/L). Broth, crude forms of capsular and slime EPS were extracted from fermented broths and used as conditioning agents by combining with 150 mg of Ca(2+)/L of kaolin suspensions. Maximum flocculation activity of 79.1% and increased dewatering by 52.2% was achieved using broth and crude capsular EPS, respectively. The results demonstrated that EPS having high flocculating capability could be produced using wastewater sludge as sole raw material.

DOI: 10.1016/j.biortech.2012.06.075
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@article{More2012BacterialPP, title={Bacterial polymer production using pre-treated sludge as raw material and its flocculation and dewatering potential.}, author={Tanaji T More and Song Yan and Nguyen Van Minh Hoang and Rajeshwar Dayal Tyagi and Rao Y. Surampalli}, journal={Bioresource technology}, year={2012}, volume={121}, pages={425-31} }