The kitchen waste such as vegetables, fruits, poultry, meat, wood, leaves, tree branches, paper, cooking oil etc., fall under this category. All these material are biodegradable. However, the biodegradation time for each individual item may vary from one month to a few decades. Material like vegetables, fruits, meat, poultry etc., degrade very fast and wood, branches, paper will take a very long time. Science had mimicked nature and many methods of rapid degradation have been developed.