title: Effect of ozonation on anaerobic digestion sludge activity and viability.
abstract: The effect of ozonation of anaerobic digested sludge on methane production was studied as a means of increasing the capacity of municipal anaerobic digesters. Ozone doses ranging from 0 to 192 mg O3/g sludge COD were evaluated in batch tests with a bench scale ozonation unit. Ozonation initially, and temporarily, reduced biomass viability and acetoclastic methanogenic activity, resulting in an initial lag phase ranging from 0.8 to 10 days. Following this lag phase, ozonation enhanced methane production with an optimal methane yield attained at 86 mg O3/g COD. Under these conditions, the yield of methane and the rate of its formation were 52% and 95% higher, respectively, than those factors measured without ozonation. A required optimal ozone dose could be feasible to improve the anaerobic digestion performance by increasing the methane production potential with a minimum impact on microbial activity; thus, an optimal ozone dose would enable an increase in the capacity of anaerobic digesters.
authors.affiliation: Polytechnique Montreal, Canada. Electronic address: jaime.chacana@polymtl.ca.
authors.forename: Jaime
authors.initials: J
authors.lastname: Chacana
authors.affiliation: Polytechnique Montreal, Canada.
authors.forename: Sanaz
authors.initials: S
authors.lastname: Alizadeh
authors.affiliation: Polytechnique Montreal, Canada; WSP, Canada.
authors.forename: Marc-André
authors.initials: MA
authors.lastname: Labelle
authors.affiliation: Water and Sanitation, Ville de Repentigny, Repentigny, Canada.
authors.forename: Antoine
authors.initials: A
authors.lastname: Laporte
authors.affiliation: Polytechnique Montreal, Canada.
authors.forename: Jalal
authors.initials: J
authors.lastname: Hawari
authors.affiliation: Polytechnique Montreal, Canada.
authors.forename: Benoit
authors.initials: B
authors.lastname: Barbeau
authors.affiliation: Polytechnique Montreal, Canada.
authors.forename: Yves
authors.initials: Y
authors.lastname: Comeau
mesh_terms: D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D008697:Methane / Q000032:analysis*; D050296:Microbial Viability; D010126:Ozone / Q000737:chemistry*; D012722:Sewage / Q000032:analysis* / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D010126:Ozone; D008697:Methane
keywords: Anaerobic digestion; Extracellular polymeric substances; Mechanisms; Ozone; Sludge