Effect of ozonation on anaerobic digestion sludge activity and viability. (June 2017)

• Record Type: Journal Article
• Authors: Chacana, Jaime; Alizadeh, Sanaz; Labelle, Marc-André; Laporte, Antoine; Hawari, Jalal; Barbeau, Benoit; Comeau, Yves
• Is Part Of: Chemosphere. Volume 176(2017)
• Page Start: 405
• Page End: 411
• Publication Date: 2017-06
• Subjects: Anaerobic digestion -- Sludge -- Ozone -- Extracellular polymeric substances -- Mechanisms; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.02.108
• Languages: English
• ISSNs: 0045-6535

Abstract

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. Highlights: Ozonation initially and temporarily reduced viability and methanogenic activity. Following the lag phase, ozonation enhanced methane production. An optimal ozone dose of 86 mg O3 /g COD increased the methane yield up to 52%.