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

Options

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

Answer

To solve the question regarding the treatment of sludge generated from wastewater treatment, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Context**:
- Wastewater treatment generates sludge, which is a byproduct of the treatment process. This sludge needs to be treated to reduce its volume and to recover useful products.

2. **Identifying the Treatment Options**:
- The options provided are:
a) Digester
b) Activated sludge
c) Chemicals
d) Oxidation pond

3. **Analyzing Each Option**:
- **Digester**: This is a controlled environment where anaerobic bacteria break down organic matter in the absence of oxygen, producing biogas (methane).
- **Activated Sludge**: This refers to the sludge that is treated in the presence of oxygen. It is not suitable for treating the sludge generated from wastewater treatment.
- **Chemicals**: The treatment of sludge typically does not involve chemical catalysts; it is primarily a biological process.
- **Oxidation Pond**: This is an open pond system that uses sunlight and oxygen for the treatment of wastewater, which does not apply to sludge treatment.

4. **Determining the Correct Answer**:
- The most appropriate method for treating the sludge generated from wastewater treatment is through a **digester**. This process utilizes anaerobic bacteria to decompose the sludge and produce biogas.

5. **Final Answer**:
- Wastewater treatment generates a large quantity of sludge, which can be treated by a **digester**.