Which method is used for the removal of sulphur dioxide and ammonia from the polluted air ?

Options

A. Wet scrubbers
B. Absorption
C. Gravitational method
D. Electrostatic precipitator

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the method used to remove sulfur dioxide and ammonia from polluted air.

2. **Identifying the Options**: The possible methods mentioned include wet scrubbers, chemical absorption, gravitational methods, and electrostatic precipitators.

3. **Analyzing Wet Scrubbers**: Wet scrubbers are devices designed to clean polluted air. They work by passing the polluted air through thin films or strands that capture pollutants like sulfur dioxide and ammonia.

4. **Functionality of Wet Scrubbers**: As the polluted air moves through the wet scrubbers, the sulfur dioxide and ammonia particles are trapped, allowing cleaner air to pass through.

5. **Evaluating Other Methods**:
- Chemical absorption is mentioned but is not specifically effective for sulfur dioxide and ammonia.
- Gravitational methods rely on gravity and are not effective for gas removal.
- Electrostatic precipitators are primarily used in automobiles for dust and gas purification but are not the main method for removing sulfur dioxide and ammonia from the air.

6. **Conclusion**: Based on the analysis, the most effective method for removing sulfur dioxide and ammonia from polluted air is the use of wet scrubbers.

**Final Answer**: The method used for the removal of sulfur dioxide and ammonia from polluted air is **wet scrubbers**.

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