Please use this identifier to cite or link to this item:
|Title:||The effect of pH on solubilization of organic matter and microbial community structures in sludge fermentation||Authors:||Maspolim, Yogananda
Ng, Wun Jern
|Keywords:||DRNTU::Engineering::Environmental engineering::Waste management||Issue Date:||2015||Source:||Maspolim, 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.||Series/Report no.:||Bioresource technology||Abstract:||Sludge 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.||URI:||https://hdl.handle.net/10356/106226
|ISSN:||0960-8524||DOI:||10.1016/j.biortech.2015.04.087||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: [http://dx.doi.org/10.1016/j.biortech.2015.04.087].||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||CEE Journal Articles|
NEWRI Journal Articles
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.