Filtration and Sedimentation are the sewage treatment steps involved in

Options

A. 1^(@)`treatment
B. `2^(@)` treatment
C. Biological treatment
D. Both B and C

Explanation

To answer the question regarding the sewage treatment steps involved in filtration and sedimentation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sewage Treatment**:
- Sewage treatment is a process aimed at removing contaminants from municipal wastewater and industrial wastewater. It typically involves multiple stages to ensure that the water is clean and safe for discharge or reuse.

2. **Identifying the Treatment Stages**:
- The sewage treatment process is generally divided into three main stages: primary treatment, secondary treatment, and tertiary treatment.

3. **Defining Primary Treatment**:
- Primary treatment is the first stage of sewage treatment. It primarily involves physical processes to remove large solids and suspended particles from the wastewater.

4. **Role of Filtration and Sedimentation**:
- In primary treatment, filtration and sedimentation are key processes.
- **Filtration** helps in removing larger particles and debris (like plastics and bottles) from the sewage.
- **Sedimentation** allows heavier particles to settle at the bottom of a tank, separating them from the liquid waste.

5. **Conclusion**:
- Since filtration and sedimentation are specifically used to remove large particles and solids from wastewater, they are integral to the primary treatment stage of sewage treatment. Therefore, the correct answer to the question is that filtration and sedimentation are the sewage treatment steps involved in **primary treatment**.

### Final Answer:
The correct option is **1. Primary Treatment**.

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