Now, the issue of waste problem denotes different level of concern (that is, the sustainability of global
environment). Not only mass disposal of municipal waste requires more consumption of goods and thus more inputs of
natural resources, but it is also environmentally hazard, such as greenhouse gas emissions in processing waste through
landfills and incineration, which cause global warming. It is known that every ton of consumer goods requires over 8
tons of original materials inputs (Brandsma, ibid), and methane generated from landfilled organic waste accounts for
about 15% of the total community GHGs emission profile (ICLEI and Torrie Smith Associates, 1999). Therefore, it is
natural and necessary to convert the ultimate target of effective management of waste streams to the issue of
environmental conservation