Some of the the waste materials that we generate in our homes are :
Spoilt food, vegetable peels, plastic, PUC, used tea leaves, milk packets, empty cartons, used cloths, paper waste, empty medicine bottles, broken foot wear, etc.

The following chart shows the time taken for commonly used materials to biodegrade:

Enzymes are specific in their action, specific enzymes are needed for breakdown of a particular substance. For example, pepsin is needed to breakdown proteins while lipase is needed to digest fats. Because enzymes are specific in their action many human made materials like plastics cannot be broken down by bacteria and other saprophytes. These materials will be acted upon by physical processes like heat and pressure but under the conditions found on the earth these materials persist for a long time.

Spoiled food, used tea leaves, vegetable peels, cotton rags, waste paper were biodegradable materials.