Influence of deflocculation on microwave disintegration and anaerobic biodegradability of waste activated sludge

Bioresource Technology
A Vimala EbenezerJ Rajesh Banu

Abstract

In the present study, the potential benefits of deflocculation on microwave pretreatment of waste activated sludge were investigated. Deflocculation in the absence of cell lysis was achieved through the removal of extra polymeric substances (EPS) by sodium citrate (0.1g sodium citrate/g suspended solids), and DNA was used as a marker for monitoring cell lysis. Subsequent microwave pretreatment yielded a chemical oxygen demand (COD) solubilisation of 31% and 21%, suspended solids (SS) reduction of 37% and 22%, for deflocculated and flocculated sludge, respectively, with energy input of 14,000kJ/kg TS. When microwave pretreated sludge was subjected to anaerobic fermentation, greater accumulation of volatile fatty acid (860mg/L) was noticed in deflocculated sludge, indicating better hydrolysis. Among the samples subjected to BMP (Biochemical methane potential test), deflocculated microwave pretreated sludge showed better amenability towards anaerobic digestion with high methane production potential of 0.615L (gVS)(-1).

References

Feb 23, 2010·Bioresource Technology·Bing TangYing Zhuo

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Citations

Sep 30, 2015·Environmental Science and Pollution Research International·S KavithaJ Rajesh Banu
Mar 31, 2016·Environmental Science and Pollution Research International·Parvathy EswariJ Rajesh Banu
Sep 12, 2015·Bioresource Technology·S KavithaJ Rajesh Banu
Jul 2, 2016·Environmental Science and Pollution Research International·V AmudhaJ Rajesh Banu
May 15, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·J Walczak, M Zubrowska-Sudol
Jul 1, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·M Al RamahiS Beszédes
Sep 6, 2020·The Science of the Total Environment·H M MahmudulM Mofijur
Nov 15, 2020·Applied Biochemistry and Biotechnology·Antonio SerranoMaría de Los Ángeles Martín
May 8, 2021·Water Research·J Rajesh BanuGopalakrishnan Kumar

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