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 anaerrobically digested in 12 successive cycles (252 days)at 21 days treatment cycle length(TCL)and temperature of 20 c using psychrotrophic anaerobic mixed culture.
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An average specific methane yield (SMY) of 184.9+-24.0,189.9+-27.3 and 222+-27.7nL CH4 Kg of VS fed has been achieved at an organic loading rate of 3.0,4.0 and 5.0 g TCOD kg inoculum d-1 and TCL of 21 days, respectively.The corresponding substrate to inoculum ratio (SIR) was 0.39+-0.06, has been obtained. The low concentration of volatile fatty acids indicated that hydrolysis was the reaction limiting step.