Which of the following in sewage treatement removes suspended solids.

Options

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

Answer

To solve the question "Which of the following in sewage treatment removes suspended solids?" we will analyze the different treatment options provided.

### Step-by-Step Solution:

1. **Understand the Types of Sewage Treatment**:
- Sewage treatment typically involves several stages: primary, secondary, and tertiary treatment. Each stage has a specific function in the treatment process.

2. **Identify the Function of Each Treatment**:
- **Primary Treatment**: This is the first stage of sewage treatment where physical processes are used to remove solids. It involves filtration and sedimentation to separate suspended solids from the liquid waste.
- **Secondary Treatment**: This stage primarily focuses on biological processes to degrade organic matter. It does not specifically target the removal of suspended solids.
- **Tertiary Treatment**: This is the final stage that further polishes the effluent, often involving chemical and biological processes, but it does not primarily remove suspended solids.
- **Sludge Treatment**: This refers to the treatment of the sludge that is collected during primary treatment, and it does not involve the removal of suspended solids from sewage.

3. **Determine the Correct Answer**:
- Since primary treatment is specifically designed to remove suspended solids through filtration and sedimentation, the correct answer to the question is **Option C: Primary Treatment**.

### Final Answer:
The correct answer is **Option C: Primary Treatment**.

---