title: Effect of NaCl induced floc disruption on biological disintegration of sludge for enhanced biogas production.
abstract: In the present study, the influence of NaCl mediated bacterial disintegration of waste activated sludge (WAS) was evaluated in terms of disintegration and biodegradability of WAS. Floc disruption was efficient at 0.03 g/g SS of NaCl, promoting the shifts of extracellular proteins and carbohydrates from inner layers to extractable--soluble layers (90 mg/L), respectively. Outcomes of sludge disintegration reveal that the maximum solubilization achieved was found to be 23%, respectively. The model elucidating the parameter evaluation, explicates that floc disrupted--bacterially disintegrated sludge (S3) showed superior biodegradability of about 0.23 (gCOD/gCOD) than the bacterially disintegrated (S2) and control (S3) sludges of about 0.13 (gCOD/gCOD) and 0.05 (gCOD/gCOD), respectively. Cost evaluation of the present study affords net profits of approximately 2.5 USD and -21.5 USD in S3 and S2 sludge.
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, Thiagarajar College of Engineering, Thiruparankundram, Madurai, India.
authors.forename: S
authors.initials: S
authors.lastname: Kaliappan
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: D001407:Bacillus / Q000145:classification / Q000187:drug effects* / Q000502:physiology*; D001673:Biodegradation, Environmental; D056804:Biofuels / Q000382:microbiology*; D019149:Bioreactors / Q000382:microbiology; D002449:Cell Aggregation / Q000187:drug effects / Q000502:physiology; D008697:Methane / Q000302:isolation & purification / Q000378:metabolism*; D012037:Refuse Disposal; D012722:Sewage / Q000382:microbiology*; D012965:Sodium Chloride / Q000494:pharmacology*; D013045:Species Specificity
chemical_list: D056804:Biofuels; D012722:Sewage; D012965:Sodium Chloride; D008697:Methane
keywords: Biochemical methane potential; Disintegration; Extracellular polymeric substance; Floc disruption; Waste activated sludge