title: Formation and degradation of valuable intermediate products during wet oxidation of municipal sludge.
abstract: The current study investigated the formation of organic acids and alcohols as major intermediate products of wet oxidation of municipal sludge. Municipal sludge was subjected to 60-min wet oxidation at temperatures ranging from 220 to 240°C, with 20bar oxygen partial pressure. Acetic acid was the main intermediate compound produced in this study, followed by propionic, n-butyric, iso-butyric and pentanoic acids and methanol. It was found that the process severity has a significant influence on the formation and degradation of these intermediate products.
authors.affiliation: Department of Chemical & Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland 1010, New Zealand. Electronic address: s.baroutian@auckland.ac.nz.
authors.forename: Saeid
authors.initials: S
authors.lastname: Baroutian
authors.affiliation: Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Rotorua 3010, New Zealand.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Gapes
authors.affiliation: Department of Civil & Environmental Engineering, Faculty of Engineering, The University of Auckland, Auckland 1010, New Zealand.
authors.forename: Ajit K
authors.initials: AK
authors.lastname: Sarmah
authors.affiliation: Department of Chemical & Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland 1010, New Zealand.
authors.forename: Mohammed M
authors.initials: MM
authors.lastname: Farid
authors.affiliation: Department of Chemical & Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland 1010, New Zealand.
authors.forename: Brent R
authors.initials: BR
authors.lastname: Young
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D000432:Methanol / Q000737:chemistry; D008970:Molecular Weight; D009930:Organic Chemicals / Q000737:chemistry; D010084:Oxidation-Reduction; D010421:Pentanoic Acids / Q000737:chemistry; D011422:Propionates / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D018505:Waste Management / Q000379:methods*
chemical_list: D009930:Organic Chemicals; D010421:Pentanoic Acids; D011422:Propionates; D012722:Sewage; C029658:propionic acid; D019342:Acetic Acid; D000432:Methanol
keywords: Hydrothermal processing; Intermediates; Municipal sludge; Organic acids; Wet oxidation