2008 Volume 45 Pages 333-339
Among various methods used for the treatment of kitchen garbage and excess sludge, anaerobic digestion is a promising technology with energy recovery, but required to be more effective. An anaerobic digester system that consists of an acidogenic reactor operating at hyperthermophilic condition and a methanogenic reactor in series was discussed. Lab-scale reactors were operated continuously fed with artificial kitchen garbage or co-substrate composed of artificial kitchen garbage and excess slude. At the acidification step, protein solubilization ratio at 70°C was higher than that at 55°C. It was suggested that the process composed of acidogenesis at 70°C and methanogenesis at 55°C is useful to increase methane production and process stability. By batch experiments, it was proved that this process had both biological and physical effects, and had higher treatment performance than heat treatment only.
