title: Hydrothermal processing of cellulose: A comparison between oxidative and non-oxidative processes.
abstract: This study investigates oxidative and non-oxidative hydrothermal processing of cellulose at five different temperatures (180-260°C). Volatile fatty acids (VFAs) concentration, total suspended solid (TSS) degradation, dissolved organic carbon (DOC) and chemical oxygen demand (COD) were measured and compared in both processes. Moreover, the existence of hydrogen peroxide in both oxidative and non-oxidative processes was confirmed experimentally for the first time in literature. At temperatures ⩽220°C the amount of H2O2produced in the oxidative process was higher (50 fold) than that of in the non-oxidative while at higher temperatures (⩾240°C) it was more for non-oxidative (3.5-5 fold). The concentration of VFAs in the non-oxidative process was lower than 10% of that in oxidative process. In both processes soluble COD increased with time and temperature, however at 260°C after reaching a maximum, it decreased with time due to conversion of some soluble intermediates to CO2and water.
authors.affiliation: Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland, New Zealand.
authors.forename: Azadeh
authors.initials: A
authors.lastname: Yousefifar
authors.affiliation: Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland, New Zealand. Electronic address: s.baroutian@auckland.ac.nz.
authors.forename: Saeid
authors.initials: S
authors.lastname: Baroutian
authors.affiliation: Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland, New Zealand.
authors.forename: Mohammed M
authors.initials: MM
authors.lastname: Farid
authors.affiliation: Scion, Te Papa Tipu Innovation Park, Rotorua, New Zealand.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Gapes
authors.affiliation: Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland, New Zealand.
authors.forename: Brent R
authors.initials: BR
authors.lastname: Young
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D057919:Biological Oxygen Demand Analysis; D002244:Carbon / Q000737:chemistry; D002482:Cellulose / Q000378:metabolism*; D005232:Fatty Acids, Volatile / Q000378:metabolism*; D005609:Free Radicals; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D012995:Solubility; D014867:Water
chemical_list: D005232:Fatty Acids, Volatile; D005609:Free Radicals; D014867:Water; D002244:Carbon; D002482:Cellulose; D006861:Hydrogen Peroxide; D019342:Acetic Acid; D010100:Oxygen
keywords: Hydrogen peroxide; Non-oxidative hydrothermal process; Organic solid waste; Oxidative hydrothermal process