title: Effect of deflocculation on the efficiency of disperser induced dairy waste activated sludge disintegration and treatment cost.
abstract: 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.
authors: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
authors: T Poornima
authors: TP
authors: Devi
authors: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
authors: A Vimala
authors: AV
authors: Ebenezer
authors: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
authors: S Adish
authors: SA
authors: Kumar
authors: Department of Civil Engineering, Thiagarajar College of Engineering, Thiruparankundram, Madurai, India.
authors: S
authors: S
authors: Kaliappan
authors: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India. Electronic address: rajeshces@gmail.com.
authors: J Rajesh
authors: JR
authors: Banu
mesh_terms: D000693:Anaerobiosis / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D001704:Biopolymers / Q000032:analysis; D003365:Costs and Cost Analysis; D003612:Dairying; D005285:Fermentation / Q000187:drug effects; D005427:Flocculation / Q000187:drug effects; D006868:Hydrolysis / Q000187:drug effects; D007700:Kinetics; D012722:Sewage / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000494:pharmacology; D012995:Solubility; D014865:Waste Disposal, Fluid / Q000191:economics*; D018508:Water Purification / Q000191:economics* / Q000379:methods*
chemical_list: D001704:Biopolymers; D012722:Sewage; D012967:Sodium Dodecyl Sulfate
keywords: Anaerobic biodegradability; Cell lysis; Dairy waste activated sludge (WAS); Extracellular polymeric substance; Specific energy