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 Primary Treatment**:
- Primary treatment is the first stage in the sewage treatment process. Its main goal is to remove solid materials from wastewater.

2. **Identifying the Components Removed**:
- During primary treatment, various components are targeted for removal. These include:
- Floating debris (such as plastic, leaves, and other large solids)
- Grit (small, heavy particles like sand and gravel)
- Pathogens (though more effectively removed in secondary treatment)
- Turbidity (cloudiness caused by suspended solids)

3. **Processes Involved in Primary Treatment**:
- The raw sewage undergoes several processes:
- **Screening**: Large objects and floating debris are removed using screens.
- **Grit Chamber**: The sewage is then passed through a grit chamber where heavier particles settle down.

4. **Final Outcome of Primary Treatment**:
- The end result of primary treatment is that the wastewater is significantly clearer, with most of the floating debris and grit removed.

5. **Conclusion**:
- Therefore, the primary treatment is primarily used to remove floating debris and grit from sewage.

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

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