There are three main ways to recycle solid waste: 1. Waste recovery: including classified collection, classification and recovery. 2, waste conversion and utilization: that is, through certain technology, using some components in waste to make new forms of substances. For example, microbial decomposition of garbage can produce compost; Cracking carved plastics to produce gasoline or diesel oil. 3. Conversion of waste into energy: that is, through chemical or biological transformation, the energy contained in waste is released and recovered. Such as garbage incineration power generation or landfill gas power generation.

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