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

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 so...

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Bibliographic Details
Published in:Bioresource technology 2015-06, Vol.185, p.194-201
Main Authors: Ebenezer, A Vimala, Kaliappan, S, Adish Kumar, S, Yeom, Ick-Tae, Banu, J Rajesh
Format: Article
Language:English
Subjects:
Anaerobiosis
Biodegradation, Environmental
Biological Oxygen Demand Analysis
Biomass
Cations
Citrates - chemistry
DNA - chemistry
Fatty Acids - chemistry
Fermentation
Flocculation
Hydrolysis
Methane - chemistry
Microwaves
Sewage
Waste Disposal, Fluid - methods
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Summary: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).
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2015.02.102