Effect of deflocculation on the efficiency of disperser induced dairy waste activated sludge disintegration and treatment cost.

Autor: Devi TP; Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India., Ebenezer AV; Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India., Kumar SA; Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India., Kaliappan S; Department of Civil Engineering, Thiagarajar College of Engineering, Thiruparankundram, Madurai, India., Banu JR; Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India. Electronic address: rajeshces@gmail.com.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2014 Sep; Vol. 167, pp. 151-8. Date of Electronic Publication: 2014 Jun 12.
DOI: 10.1016/j.biortech.2014.06.004
Abstrakt: Excess sludge disintegration by energy intensive processes like mechanical pretreatment is considered to be high in cost. In this study, an attempt has been made to disintegrate excess sludge by disperser in a cost effective manner by deflocculating the sludge using sodium dodecyl sulphate (SDS) at a concentration of 0.04 g/g SS. The disperser pretreatment was effective at a specific energy input of 5013 kJ/kg TS where deflocculated sludge showed higher chemical oxygen demand solubilisation and suspended solids reduction of 26% and 22.9% than flocculated sludge and was found to be 18.8% and 18.6% for former and latter respectively. Higher accumulation of volatile fatty acid (700 mg/L) in deflocculated sludge indicates better hydrolysis of sludge by proposed method. The anaerobic biodegradability resulted in higher biogas production potential of 0.522 L/(g VS) for deflocculated sludge. Cost analysis of the study showed 43% net energy saving in deflocculated sludge.
(Copyright © 2014 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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