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dc.contributor.authorMaspolim, Yoganandaen
dc.contributor.authorZhou, Yanen
dc.contributor.authorGuo, Chenghongen
dc.contributor.authorXiao, Kekeen
dc.contributor.authorNg, Wun Jernen
dc.identifier.citationMaspolim, Y., Zhou, Y., Guo, C., Xiao, K., & Ng, W. J. (2015). The effect of pH on solubilization of organic matter and microbial community structures in sludge fermentation. Bioresource technology, 190, 289-298.en
dc.description.abstractSludge fermentation between pH 4 and 11 was investigated to generate volatile fatty acids (VFA). Despite the highest sludge solubilization of 25.9% at pH 11, VFA accumulation was optimized at pH 8 (12.5% out of 13.1% sludge solubilization). 454 pyrosequencing identified wide diversity of acidogens in bioreactors operated at the various pHs, with Tissierella, Petrimonas, Proteiniphilum, Levilinea, Proteiniborus and Sedimentibacter enriched and contributing to the enhanced fermentation at pH 8. Hydrolytic enzymatic assays determined abiotic effect to be the leading cause for improved solubilization under high alkaline condition but the environmental stress at pH 9 and above might lead to disrupt biological activities and eventually VFA production. Furthermore, molecular weight (MW) characterization of the soluble fractions found large MW aromatic substances at pH 9 and above, that is normally associated with poor biodegradability, making them disadvantageous for subsequent bioprocesses. The findings provided information to better understand and control sludge fermentation.en
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en
dc.format.extent38 p.en
dc.relation.ispartofseriesBioresource technologyen
dc.rights© 2015 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Bioresource Technology, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].en
dc.subjectDRNTU::Engineering::Environmental engineering::Waste managementen
dc.titleThe effect of pH on solubilization of organic matter and microbial community structures in sludge fermentationen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen
dc.contributor.organizationPublic Utilities Board of Singaporeen
dc.contributor.researchNanyang Environment and Water Research Instituteen
dc.description.versionAccepted versionen
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