title: Combined thermo-chemo-sonic disintegration of waste activated sludge for biogas production.
abstract: In the present study, there was an investigation about the impact of a new combined thermo-chemo-sonic disintegration of waste activated sludge (WAS) on biodegradability. The outcome of sludge disintegration reveals that maximum Suspended Solids (SS) reduction and Chemical Oxygen Demand (COD) solubilization effectuated at a specific energy input of 5290.5kJ/kgTS, and was found to be 20%, 16.4%, 15% and 27%, 22%, and 20%, respectively for the three alkalis (NaOH, KOH, and Ca(OH)2). The conversion coefficient of the Volatile Suspended Solids (VSS) to product Soluble COD (SCOD), calculated by nonlinear regression modeling, was found to be 0.5530gSCOD/gVSS, 0.4587gSCOD/gVSS, and 0.4195gSCOD/gVSS for NaOH, KOH, and Ca(OH)2, respectively. In the biodegradability studies, the parameter evaluation provides an estimate of parameter uncertainty and correlation, and elucidates that there is no significant difference in biodegradability (0.413gCOD/gCOD, 0.367gCOD/gCOD, and 0.342gCOD/gCOD) for three alkalis (NaOH, KOH, and Ca(OH)2).
authors.affiliation: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
authors.forename: S
authors.initials: S
authors.lastname: Kavitha
authors.affiliation: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
authors.forename: R
authors.initials: R
authors.lastname: Yukesh Kannah
authors.affiliation: Department of Civil and Environmental Engineering, Sungkyunkwan University, South Korea.
authors.forename: Ick Tae
authors.initials: IT
authors.lastname: Yeom
authors.affiliation: School of Environmental Science and Technology, Hanoi University of Science and Technology, Viet Nam.
authors.forename: Khac-Uan
authors.initials: KU
authors.lastname: Do
authors.affiliation: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India. Electronic address: rajeshces@gmail.com.
authors.forename: J Rajesh
authors.initials: JR
authors.lastname: Banu
mesh_terms: D000468:Alkalies / Q000737:chemistry; D001673:Biodegradation, Environmental; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D003365:Costs and Cost Analysis; D007700:Kinetics; D012044:Regression Analysis; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D014865:Waste Disposal, Fluid / Q000191:economics / Q000379:methods*
chemical_list: D000468:Alkalies; D056804:Biofuels; D012722:Sewage
keywords: Biodegradability; Nonlinear regression; Solubilization; Thermo-chemo-sonic disintegration; Waste activated sludge (WAS)