title: Pretreatment of municipal waste activated sludge for volatile sulfur compounds control in anaerobic digestion.
abstract: The effect of combination of mechanical and chemical pretreatment of municipal waste activated sludge (WAS) prior to anaerobic digestion was studied using a laboratory scale system with an objective to decrease volatile sulfur compounds in biogas and digested sludge. Mechanical pretreatment was conducted using depressurization of WAS through a valve from a batch pretreatment reactor pressurized at 75 ± 1 psi, while combined pretreatments were conducted using six different dosages of hydrogen peroxide (H(2)O(2)) and ferrous chloride (FeCl(2)) along with mechanical pretreatment. About 37-46% removal of H(2)S in biogas occurred for different combined pretreatment conditions. Sludge solubilization achieved due to the mechanical pretreatment increased total cumulative methane production by 8-10% after 30 days during the biochemical methane potential (BMP) test. The pretreatment also improved dewaterability in terms of time to filter (TTF), and decreased methyl mercaptan generation potential of the digested sludge.
authors.affiliation: Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada.
authors.forename: Bipro Ranjan
authors.initials: BR
authors.lastname: Dhar
authors.forename: Emhemmed
authors.initials: E
authors.lastname: Youssef
authors.forename: George
authors.initials: G
authors.lastname: Nakhla
authors.forename: Madhumita B
authors.initials: MB
authors.lastname: Ray
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D001709:Biotechnology / Q000379:methods; D005296:Ferrous Compounds / Q000737:chemistry; D005374:Filtration; D005740:Gases; D006861:Hydrogen Peroxide / Q000737:chemistry; D006862:Hydrogen Sulfide / Q000737:chemistry; D008697:Methane / Q000737:chemistry; D011312:Pressure; D012722:Sewage; D013455:Sulfur / Q000737:chemistry*; D014873:Water Pollutants; D018508:Water Purification / Q000379:methods*
chemical_list: D005296:Ferrous Compounds; D005740:Gases; D012722:Sewage; D014873:Water Pollutants; D013455:Sulfur; D006861:Hydrogen Peroxide; D008697:Methane; C029451:ferrous chloride; D006862:Hydrogen Sulfide