Which among the following is not a sterilization method of water?

Options

A. Boiling
B. Chemical treatment
C. Exposure to sunlight
D. Sedimentation

Explanation

To determine which among the following is not a sterilization method of water, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Sterilization Methods**:
Sterilization methods are processes used to purify water by eliminating microorganisms. Common methods include boiling, chemical treatments, and exposure to sunlight.

2. **Evaluate Each Option**:
- **Boiling**: Water is boiled at 100 degrees Celsius. This temperature kills most microorganisms, making it a sterilization method.
- **Chemical Treatment**: Chemicals like bleaching powder (CaOCl2) are used to disinfect water. This is also a recognized sterilization method.
- **Exposure to Sunlight**: Sunlight can help purify water through the process of evaporation and UV radiation, which kills microorganisms. This is considered a sterilization method.
- **Sedimentation**: This process involves allowing solid suspended particles to settle at the bottom of the water container. While it helps in clarifying water, it does not kill microorganisms and is therefore not a sterilization method.

3. **Conclusion**:
Based on the evaluation, the option that is not a sterilization method of water is **Sedimentation**.

### Final Answer:
The correct answer is **Sedimentation**.

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