In the treatment of sewage, primary treatment is used to remove

Options

A. Pesticides
B. DDT and pathogen
C. Turbidity in waste water
D. Floating debris and grit

Answer

### Step-by-Step Solution:

1. **Understanding Sewage Treatment**: The sewage treatment process is divided into several stages, primarily categorized into primary, secondary, and tertiary treatments. Each stage has a specific purpose in the overall treatment of wastewater.

2. **Identifying Primary Treatment**: The primary treatment is the first step in sewage treatment. Its main goal is to remove large solids and debris from the sewage.

3. **Components Removed in Primary Treatment**: During primary treatment, large particles such as floating debris, grit (sand, gravel), and other large substances are removed. This is typically done through processes like screening and sedimentation.

4. **Exclusion of Smaller Particles**: It is important to note that primary treatment does not remove dissolved substances or smaller particles. These will be addressed in the subsequent secondary treatment stage.

5. **Conclusion**: Therefore, the primary treatment is specifically used to remove large solids and floating debris from sewage.

### Final Answer:
In the treatment of sewage, primary treatment is used to remove large solids and floating debris.