The suspended solids in sewage can be removed at which step in the process of sewage treatement?

Options

A. Secondary treatment
B. Primary treatment
C. Sludge treatment
D. Tertiary treatment

Answer

**Step-by-Step Solution:**

1. **Understanding Sewage Treatment**: The sewage treatment process typically involves several stages, each designed to remove different types of contaminants from wastewater.

2. **Identifying the Types of Treatment**:
- **Primary Treatment**: This is the first step in sewage treatment, where physical processes are used to remove large particles and suspended solids.
- **Secondary Treatment**: This step typically involves biological processes to remove dissolved organic matter.
- **Tertiary Treatment**: This is the advanced treatment stage aimed at removing remaining impurities, including nutrients.
- **Sludge Treatment**: This involves the processing of the solid waste (sludge) that is generated during the treatment process.

3. **Focusing on Suspended Solids**: The question specifically asks about the removal of suspended solids. These are typically larger particles that can be physically separated from the liquid.

4. **Analyzing the Options**:
- **Option A: Secondary Treatment**: This is not primarily focused on suspended solids; it deals more with dissolved organic matter.
- **Option B: Primary Treatment**: This stage is specifically designed to remove suspended solids through physical processes such as screening and sedimentation.
- **Option C: Sludge Treatment**: This deals with the solid waste after treatment, not the initial removal of suspended solids.
- **Option D: Tertiary Treatment**: This step is aimed at further purification and does not primarily focus on suspended solids.

5. **Conclusion**: Based on the analysis, the correct answer is **Option B: Primary Treatment**, as this is the stage where suspended solids in sewage are effectively removed.