TY - JOUR
T1 - Influence of deflocculation on microwave disintegration and anaerobic biodegradability of waste activated sludge
AU - Ebenezer, A. Vimala
AU - Kaliappan, S.
AU - Adish Kumar, S.
AU - Yeom, Ick Tae
AU - Banu, J. Rajesh
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - 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.
AB - 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.
KW - Anaerobic biodegradability
KW - Deflocculation
KW - Microwave irradiation
KW - Pretreatment
KW - Waste activated sludge
UR - https://www.scopus.com/pages/publications/84924560191
U2 - 10.1016/j.biortech.2015.02.102
DO - 10.1016/j.biortech.2015.02.102
M3 - Article
C2 - 25770466
AN - SCOPUS:84924560191
SN - 0960-8524
VL - 185
SP - 194
EP - 201
JO - Bioresource Technology
JF - Bioresource Technology
ER -
