Describe the types of waste.

Wastes are the materials that unwanted or have no use any longer. They can be classified in two ways.

1. Depending on the physical state:

Solid waste- wastes that are solid in state, e.g. paper, glass, etc.

Liquid waste- wastes that are liquid in state.

2. Depending on nature:

Biodegradable wastes- waste that can be degraded by biological processes.

Non-biodegradable waste- wastes that cannot be degraded by biological processes.