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Effect of deflocculation on the efficiency of sludge reduction by Fenton process.

Amudha, V.; Kavitha, S.; Fernandez, C.; Adishkumar, S.; Banu, J. Rajesh


V. Amudha

S. Kavitha

S. Adishkumar

J. Rajesh Banu


A novel approach to improve the efficiency of Fenton treatment for sludge reduction through the implication of a deflocculating agent citric acid, for the exclusion of extracellular polymeric substances (EPS) from waste-activated sludge (WAS), was investigated. Deflocculation was achieved with 0.06 g/g suspended solids (SS) of citric acid dosage. Fenton optimization studies using response surface methodology (RSM) revealed that 0.5 and 0.0055 g/g SS were the optimal dosages of H2O2 and Fe2+. The addition of a cation-binding agent set the pH value of sludge to 5 which did not affect the Fenton efficiency. The results presented in this study shows the advantage of deflocculating the sludge as SS and volatile suspended solids (VSS) reductions were found to be higher in the deflocculated (53 and 63 %, respectively) than in the flocculated (22 and 34 %, respectively) sludges. Kinetic investigation of the treatment showed that the rate of the reaction was four times higher in the deflocculated sludge than control. The methodology reported in this manuscript was successfully applied to a real case were the deflocculated mediated Fenton process reduced the sludge disposal cost from 297.8 to 61.9 US dollars/ton of sludge.


AMUDHA, V., KAVITHA, S., FERNANDEZ, C., ADISHKUMAR, S. and RAJESH BANU, J. 2016. Effect of deflocculation on the efficiency of sludge reduction by Fenton process. Environmental science and pollution research [online], 23(19), pages 19281-19291. Available from:

Journal Article Type Article
Acceptance Date Jun 20, 2016
Online Publication Date Jun 30, 2016
Publication Date Oct 1, 2016
Deposit Date Jul 7, 2016
Publicly Available Date Jul 1, 2017
Journal Environmental science and pollution research
Print ISSN 0944-1344
Electronic ISSN 1614-7499
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 23
Issue 19
Pages 19281-19291
Keywords Wasteactivated sludge; Extrapolymeric substances; Citric acid; Deflocculation; Fenton reaction; Sludge reduction
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