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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.

More, Tanaji; Yan, Song; Tyagi, Rajeshwar Dayal; Surampalli, Rao Y. (2016). 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. Water Environment Research , vol. 88 , nº 5. p. 425-437. DOI: 10.2175/106143016X14504669768453.

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Résumé

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 (Ca2+, Mg2+, Fe3+, and Al3+) 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.

Type de document:
Mots-clés libres: biopolymers; cations; extracellular polymeric; substances; flocculation; mixed culture; wastewater sludge; wastewater treatment; water treatment
Centre: Centre Eau Terre Environnement
Date de dépôt: 20 déc. 2016 16:17
Dernière modification: 22 déc. 2016 20:30
URI: http://espace.inrs.ca/id/eprint/3995

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