title: The enhancement of anaerobic biodegradability of waste activated sludge by surfactant mediated biological pretreatment.
abstract: In this study, the role of sodium dodecyl sulfate (SDS) was explored for the removal of extracellular polymeric substance (EPS) from waste activated sludge (WAS) followed by enzymatic bacterial pretreatment, which enhanced the subsequent anaerobic biodegradability. EPS was removed with 0.02 g/g SS of SDS. In the results of pretreatment, the suspended solids reduction and chemical oxygen demand solubilization were found to be 25.7% and 19.79% for deflocculated and bacterially pretreated sludge, whereas they were found to be 15.7% and 11% for flocculated sludge (without EPS removal and bacterially pretreated) and 7.85% and 6% for control sludge (raw sludge), respectively. Upon examining the anaerobic biodegradability, the biogas yield potential of deflocculated and bacterially pretreated, flocculated, deflocculated alone, and control sludges were found to be 0.467 L/(g VS), 0.355 L/(g VS), 0.315 L/(g VS), and 0.212 L/(g VS), respectively. Thus, the deflocculation and bacterial pretreatment improved the anaerobic biodegradability efficiently.
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: C
authors.initials: C
authors.lastname: Jayashree
authors.affiliation: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
authors.forename: S
authors.initials: S
authors.lastname: Adish Kumar
authors.affiliation: Department of Civil and Environmental Engineering, Sungkyunkwan University, Seoul, South Korea.
authors.forename: Ick Tae
authors.initials: IT
authors.lastname: Yeom
authors.affiliation: Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India. Electronic address: rajeshces@gmail.com.
authors.forename: J
authors.initials: J
authors.lastname: Rajesh Banu
mesh_terms: D000468:Alkalies / Q000494:pharmacology; D000693:Anaerobiosis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D001426:Bacterial Proteins / Q000032:analysis; D001673:Biodegradation, Environmental / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D001704:Biopolymers / Q000302:isolation & purification; D002241:Carbohydrates / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007194:India; D007700:Kinetics; D012722:Sewage / Q000382:microbiology*; D012967:Sodium Dodecyl Sulfate / Q000494:pharmacology; D013501:Surface-Active Agents / Q000494:pharmacology*
chemical_list: D000468:Alkalies; D001426:Bacterial Proteins; D001704:Biopolymers; D002241:Carbohydrates; D012722:Sewage; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate
keywords: Anaerobic biodegradability; Cell disruption; Enzyme activity; Extracellular polymeric substance; Waste activated sludge (WAS)