The primary treatment basically involves the physical removal of particles from the sewage through

Options

A. filtration
B. sedimentation
C. microbial treatment
D. Both (A) and (B)

Answer

To solve the question regarding the primary treatment of sewage and the physical removal of particles, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Primary Treatment**:
- Primary treatment of sewage is the initial step in wastewater treatment, which focuses on the physical removal of solid particles from the sewage.

2. **Analyzing the Options**:
- We need to evaluate the provided options to identify which processes are involved in the physical removal of particles from sewage.

3. **Option A: Filtration**:
- Filtration is a process that separates solid particles from liquids by passing the mixture through a filter. This method effectively removes suspended solids from sewage.
- **Conclusion**: This option is correct.

4. **Option B: Sedimentation**:
- Sedimentation involves allowing the sewage to sit undisturbed so that heavier solid particles settle at the bottom due to gravity. This process is also effective in removing suspended solids.
- **Conclusion**: This option is correct.

5. **Option C: Microbial Treatment**:
- Microbial treatment involves the use of microorganisms to break down organic matter in sewage. This process is not primarily focused on the physical removal of particles but rather on biological decomposition.
- **Conclusion**: This option is incorrect.

6. **Option D: Both A and B**:
- Since both filtration and sedimentation are correct methods for the physical removal of particles from sewage, this option is also correct.
- **Conclusion**: This option is correct.

7. **Final Answer**:
- The correct answer to the question is **Option D: Both A and B**.