title: Psychrophilic dry anaerobic digestion of dairy cow feces: long-term operation.
abstract: This paper reports experimental results which demonstrate psychrophilic dry anaerobic digestion of cow feces during long-term operation in sequence batch reactor. Cow feces (13-16% total solids) has been anaerobically digested in 12 successive cycles (252 days) at 21 days treatment cycle length (TCL) and temperature of 20 °C using psychrotrophic anaerobic mixed culture. An average specific methane yield (SMY) of 184.9 ± 24.0, 189.9 ± 27.3, and 222 ± 27.7 (N)L CH4 kg(-1) of VS fed has been achieved at an organic loading rate of 3.0, 4.0, and 5.0 g TCOD kg(-1) inoculum d(-1) and TCL of 21 days, respectively. The corresponding substrate to inoculum ratio (SIR) was 0.39 ± 0.06, 0.48 ± .02, 0.53 ± 0.05, respectively. Average methane production rate of 10 ± 1.4(N)L CH4 kg(-1) VS fed d(-1) has been obtained. The low concentration of volatile fatty acids indicated that hydrolysis was the reaction limiting step.
authors.affiliation: Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec, Canada J1M 0C8. Electronic address: Daniel.masse@agr.gc.ca.
authors.forename: Daniel I
authors.initials: DI
authors.lastname: Massé
authors.affiliation: Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec, Canada J1M 0C8.
authors.forename: Noori M
authors.initials: NM
authors.lastname: Cata Saady
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D019149:Bioreactors; D002417:Cattle; D005243:Feces / Q000737:chemistry*; D005260:Female; D006358:Hot Temperature; D008697:Methane / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*
chemical_list: D008697:Methane
keywords: Dry Anaerobic; Manure; Psychrophilic; Straw