Abstract
Because of municipal solid waste reduction according to depopulation or promotion of 3R, in the future, many local governments will face the difficulty in operation of municipal waste treatment systems, depending on their population size. On the other hand, biogas plants (BP) has been focused as a one of treatment systems for combustible waste in terms of effective energy recovery. So in this study, we investigated effective waste treatment systems in terms of an effective role of BP under the condition of waste reduction , especially focusing the efficiency of costs and energy. As a result, in small scale population, an operation of BP for only kitchen waste would be impossible. A mechanical-sieving and and dry-fermentation system in the middle scale would be effective if energy recovery is prioritized. A kitchen waste separation and wet- fermentation system in large scale would be cost-effective, although it might be necessary to consider a change of separate collection.
