What are the different methods of waste disposal?

Explanation

### Step-by-Step Solution:

1. **Biogas Plant**:
- Biogas plants utilize biodegradable waste, which is waste that can be easily decomposed by living organisms.
- The process involves breaking down organic materials to produce biogas and manure, which can be used as a renewable energy source and fertilizer.

2. **Sewage Treatment Plant**:
- Sewage treatment plants are designed to clean wastewater before it is released into natural water bodies like rivers and ponds.
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