Anaerobic digestion such as methane fermentation is attracting much attention for it's application in the treatment and utilization of garbage (Lee et al.2009a:Angeludaki et al 2006) because of its low low environmental impact,low production of residual sludge,and recovery of biogas for use as an energy source (Ahring 2003:Forster-Carniro et al.2008;Angeludaki et al.2011)