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Extracellular polymeric substances production kinetics of 13 sludge isolates using wastewater sludge as raw material and its flocculation potential.

More, Tanaji; Mahmoudi, Amine; Yan, Song; Tyagi, Rajeshwar Dayal (2015). Extracellular polymeric substances production kinetics of 13 sludge isolates using wastewater sludge as raw material and its flocculation potential. Environmental Technology , vol. 36 , nº 23 S1. p. 3022-3035. DOI: 10.1080/09593330.2014.952344.

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Résumé

La transcription des symboles et des caractères spéciaux utilisés dans la version originale de ce résumé n’a pas été possible en raison de limitations techniques. La version correcte de ce résumé peut être lue en PDF.

The kinetics of batch fermentation of 13 extracellular polymeric substances (EPS) producing bacterial strains (9 Bacillus, 2 Serratia and 2 Yersinia) were carried out using sterilized sludge as a raw material. The most of Bacillus (µmax: 0.11–0.27 h−1), Serratia (µmax: 0.23–0.27 h−1) and Yersinia (µmax: 0.18–0.19 h−1) strains had capability to grow and produce EPS (1.36–2.12 g/L) in the sterilized sludge. In general, EPS production was mixed growth associated for all the bacterial strains cultivated independently. Bacillus sp. 7, Serratia sp. 2 and Yersinia sp. 2 produced higher concentration (1.95–2.12 g/L) of EPS than the other remaining bacterial strains. Protein and carbohydrate contents of EPS remained constant during fermentation. Broth EPS (B-EPS) exhibited high kaolin flocculation activity (≥75%) in most of the cases except Bacillus sp. 1, Bacillus sp. 5 and Bacillus sp. 9, respectively. In general, high flocculation activities (FAs) (≥75%), were attained using 1.31–1.70 mg B-EPS/g kaolin, 0.45–0.97 mg protein/g kaolin and 0.11–0.21 mg carbohydrates/g kaolin. The study suggests that further systematic exploration is required for optimizing the process of EPS production. EPS produced in the sludge can potentially be used for different water and wastewater treatments.

Type de document: Article
Informations complémentaires: Résumé avec symboles
Mots-clés libres: extracellular polymeric substances; growth rate; kinetics; production; wastewater sludge
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 avr. 2018 19:12
Dernière modification: 18 avr. 2018 19:12
URI: http://espace.inrs.ca/id/eprint/3638

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