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COMPACTION 1) The waste is compacted or compressed. It also breaks up large or fragile items of waste. 2) This process is conspicuous in the feed at the back end of many garbage collection vehicles. 3) Deposit refuse at bottom of slope for best compaction and control of blowing litter. PYROLYSIS 1) Pyrolysis is defined as thermal degradation of waste in the absence of air to produce char, pyrolysis oil and syngas , e.g. the conversion of wood to charcoal also it is defined as destructive distillation of waste in the absence of oxygen. 2) External source of heat is employed in this process.