Wastewater treatment generates a large quantity of sludge, which can be treated by

Options

A. digesters
B. activated sludge
C. chemicals
D. oxidation pond

Explanation

**Step-by-Step Solution:**

1. **Understanding Sludge Generation**: Wastewater treatment processes generate a significant amount of sludge, which is a thick, soft, and muddy deposit resulting from the treatment of wastewater.

2. **Identifying Treatment Methods**: We need to identify how this sludge can be treated. The options given are:
- A. Digester
- B. Activated Sludge
- C. Chemicals
- D. Oxidation Pond

3. **Analyzing the Options**:
- **A. Digester**: This refers to an anaerobic digester, which is a large heated tank where microorganisms break down organic matter in the absence of oxygen. This process effectively reduces the volume of sludge and stabilizes it.
- **B. Activated Sludge**: This is a process used in wastewater treatment but is not a method for treating the sludge itself.
- **C. Chemicals**: While chemicals can be used in various treatment processes, they are not typically used for treating sludge directly.
- **D. Oxidation Pond**: This is a method for treating wastewater using aerobic processes, but it is not specifically for treating sludge.

4. **Conclusion**: The most appropriate method for treating sludge generated from wastewater treatment is the anaerobic digester. This method utilizes microorganisms to break down the sludge without the presence of oxygen.

5. **Final Answer**: The correct answer is **A. Digester**.

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