Feasibelity Study On Anaerobic Digestion Echnology For Processing Mixed Collection Municipal Solid Waste On Chinese Situation

As Sustainable development and circular economy have been a global awareness , recycling of municipal solid waste (MSW) draws more and more attention. High organic content of MSW will further increase as a result of the economy development, improvment of living standards and the increasing of gas usage in cities, and so on. Also the biodegradability of municipal solid waste will be improved.The current technologies of dealing biomass waste are composting and anaerobic digestion. Foreign development of composting technology dates back to seventies and eighties in the last century. The green garbage from source separate collection is used as raw material, and compost products can be returned to field or used for cities or garden. China's solid waste composting has developed for decades. The static aerobic composting secondary fermentation process is mainly used. In this paper, based on a lot of research and experiment, we analysis the problems of China's mechanical sorting of mixed MSW to produce agricultural compost, pointing out that it's not suitable for China's basic conditions.Anaerobic digestion is one of the main methods for disposing biomass of MSW in the developed countries. Although anaerobic digestion has a long history of development in China, it is mainly used in rural biogas, seldom used in MSW. In spite of the large number of biogas projects, the electric power from biogas is less than 3% of the total.As for very few examples of anaerobic digestion process for MSW, in order to have a better evaluation of biological treatment in our country, taking the average daily dealing 100 tons of MSW from mixed collection for example, we analysis and evaluate economic and operating costs of the typical composting and anaerobic digestion process. By comparing, we obtained that as long as the raw material is from mixed collection, the more production by the composting process means more yield loss. Anaerobic digestion process for power-generation needs more investment about 1.5 times comparing to composting process, if not taking state aid into consideration, it will lose money. Even taking state aid into consideration, its outcome is very poor. Non-power generation technology of anaerobic digestion needs investment about 0.7 times comparing to composting process, if not taking state aid into consideration, it will lose money. If taking state aid into consideration, its outcome is good. Through economic analysis we know that biogas as a power fuel has a certain economic advantage, but using in communities for their own does not have any economic advantages.