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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 et 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: Article
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: https://espace.inrs.ca/id/eprint/3995

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