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Enhanced Composting Leachate Treatment Using Extracellular Polymeric Substances as Bioflocculant.

Kaur, Rajwinder; Roy, Dany; Yellapu, Sravan Kumar; Tyagi, Rajeshwar Dayal; Drogui, Patrick; Surampalli, Rao Y. (2019). Enhanced Composting Leachate Treatment Using Extracellular Polymeric Substances as Bioflocculant. Journal of Environmental Engineering , vol. 145 , nº 11. 04019075. DOI: 10.1061/(ASCE)EE.1943-7870.0001584.

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Résumé

This study investigates the use of extracellular polymeric substance (EPS), an eco-friendly and biodegradable bioflocculant, for the treatment of composting leachate [raw leachate (BR9) and biologically treated leachate (BB1)]. The removal of chemical oxygen demand (COD) (69% for BR9 and 92% for BB1), phosphorus (92% for BR9 and 94% for BB1) and ammoniacal nitrogen (65.7% for BR9 and 96% for BB1) was higher using a combination of slime-EPS (S-EPS) and FeSO₄ than using slime-EPS alone for both leachates. However, removal of nitrates–nitrites (95% for BR9 and 99% for BB1) and metals (60%–98%) was higher using slime-EPS without the addition of FeSO₄. In all experiments, slime-EPS performed better than broth-EPS (B-EPS). Further optimization of pH (5–9) and incubation time (0.5–12 h) revealed that the maximum removal of COD, phosphate, ammoniacal nitrogen, nitrates–nitrites, and metals was obtained using a slime-EPS concentration of 0.5  g/L0.5  g/L at pH 8 (leachate pH) and 8 h of incubation time. Moreover, the settled solids after EPS treatment produced a slime-EPS of 13  g/L13  g/L in 72 h, which could be used for the treatment of composting leachate.

Type de document: Article
Mots-clés libres: biodegradable polymers; chemical oxygen demand; iron compounds; nitrates; nitrogen removal
Centre: Centre Eau Terre Environnement
Date de dépôt: 04 déc. 2019 14:51
Dernière modification: 04 déc. 2019 14:51
URI: http://espace.inrs.ca/id/eprint/9641

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