, since acid-producing bacteria and methanogen had different requirements on the environment in the process of the anaerobic digestion (Mensah and Forster, 2003; Ren et al., 2002).
, since acid-producing bacteriaand methanogen had different requirements on the environmentin the process of the anaerobic digestion (Mensah and Forster,2003; Ren et al., 2002).