title: New mechanistically based model for predicting reduction of biosolids waste by ozonation of return activated sludge.
abstract: Two pilot-scale activated sludge reactors were operated for 98 days to provide the necessary data to develop and validate a new mathematical model predicting the reduction of biosolids production by ozonation of the return activated sludge (RAS). Three ozone doses were tested during the study. In addition to the pilot-scale study, laboratory-scale experiments were conducted with mixed liquor suspended solids and with pure cultures to parameterize the biomass inactivation process during exposure to ozone. The experiments revealed that biomass inactivation occurred even at the lowest doses, but that it was not associated with extensive COD solubilization. For validation, the model was used to simulate the temporal dynamics of the pilot-scale operational data. Increasing the description accuracy of the inactivation process improved the precision of the model in predicting the operational data.
authors.affiliation: Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal, QC, Canada H3A 0C3.
authors.forename: Siavash
authors.initials: S
authors.lastname: Isazadeh
authors.affiliation: Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal, QC, Canada H3A 0C3.
authors.forename: Min
authors.initials: M
authors.lastname: Feng
authors.affiliation: Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal, QC, Canada H3A 0C3.
authors.forename: Luis Enrique
authors.initials: LE
authors.lastname: Urbina Rivas
authors.affiliation: Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal, QC, Canada H3A 0C3. Electronic address: dominic.frigon@mcgill.ca.
authors.forename: Dominic
authors.initials: D
authors.lastname: Frigon
mesh_terms: D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors; D008962:Models, Theoretical; D016877:Oxidants / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D016877:Oxidants; D012722:Sewage; D010126:Ozone
keywords: ASM3; Biomass inactivation; COD transformation; Modeling; Ozone; Sludge reduction