In these systems, wet waste is crushed and dehumidified by an exclusive process, and the leachate produced by treatment systems is converted into water that can be used for agriculture and is environmentally friendly. The final product is a kind of organic soil that is not harmful to humans and the environment and is free of any harmful vapors and odors.
During the 1980s and 1970s, due to rising oil prices, it was decided to replace this fuel with new energy sources. Meanwhile, municipal waste was identified as a potential source. A large percentage of waste is combustible components that can be used to generate heat energy. At the same time, a high percentage of combustible components are decomposable in municipal solid waste (MSW) and can be converted to gaseous fuels, which are used to generate heat energy. In general, the separation of combustible components from MSW into energy conversion is done using front-end and back-end methods. Combustible components isolated from MSW are known as Refuse derived fuel (RDF). These components mostly include paper and plastic. In the pre-processing part, most combustible components are separated by mechanical methods or manually or a combination of the two methods. The most important issue in this section is the separation of organic compounds or combustible materials from non-combustible materials in MSW. The output of this part is the feed of the next part (Back-end). In this part, the combustible components isolated are converted into fuel or heat energy using thermal or biological techniques.