title: Radiofrequency-oxidation treatment of sewage sludge.
abstract: A novel thermal-chemical treatment technology using radiofrequency heating and oxidants (hydrogen peroxide, ozone and a combination of both) was used for the treatment of sewage sludge. This was to evaluate the process effectiveness on cell disintegration and nutrient release of sludge, physical property changes such as particle size distribution, dewaterability and settleability, and their inter-relationships. The effectiveness of treatment processes was in the following order, from the most to least: thermal-oxidation process, oxidation process and thermal process. The thermal-oxidation process greatly increased cell disintegration and nutrient release, improved settleability, and decreased particle sizes. The treatment scheme involving ozone addition followed by hydrogen peroxide and radiofrequency heating yielded the highest soluble chemical oxygen demand, volatile fatty acids, ammonia and metals, while proffering the shortest capillary suction time and excellent settling properties.
authors.affiliation: Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, B.C., Canada.
authors.forename: Asha
authors.initials: A
authors.lastname: Srinivasan
authors.affiliation: Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, B.C., Canada.
authors.forename: Chris
authors.initials: C
authors.lastname: Young
authors.affiliation: Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, B.C., Canada.
authors.forename: Ping H
authors.initials: PH
authors.lastname: Liao
authors.affiliation: Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, B.C., Canada. Electronic address: kvlo@civil.ubc.ca.
authors.forename: Kwang V
authors.initials: KV
authors.lastname: Lo
mesh_terms: D057919:Biological Oxygen Demand Analysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D008872:Microwaves; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D016877:Oxidants; D012722:Sewage; D014874:Water Pollutants, Chemical; D010126:Ozone; D006861:Hydrogen Peroxide
keywords: Nutrient release; Radiofrequency; Sludge; Solids disintegration