Pollutants which can be removed by a scrubber

Options

A. Particulate matter
B. Unburnt hydrocarbon
C. `SO_(2)`
D. Sewage

Answer

### Step-by-Step Solution:

1. **Understanding Scrubbers**: Scrubbers are air pollution control devices used to remove pollutants from industrial exhaust gases. They are particularly effective in reducing acidic gases and particulate matter.

2. **Types of Pollutants Removed**:
- **Particulate Matter**: Scrubbers can effectively remove particulate matter from the air. This includes dust, soot, and other small particles that can be harmful to health.
- **Sulfur Dioxide (SO2)**: Scrubbers are designed to remove sulfur dioxide, which is a significant contributor to acid rain and can cause respiratory problems.
- **Unburnt Hydrocarbons**: While scrubbers can help in some cases, they are generally not the primary technology used for removing unburnt hydrocarbons. Other methods like catalytic converters are more effective for this purpose.

3. **Mechanism of Action**: When exhaust gases pass through a scrubber, they are often sprayed with water or a chemical solution. This process helps to capture and remove harmful pollutants. The heavier particles settle down due to gravity, while the cleaner air is released into the atmosphere.

4. **Limitations**: Scrubbers are not effective for all types of pollutants. For example, they do not typically remove sewage or certain volatile organic compounds (VOCs) effectively.

5. **Conclusion**: The main pollutants that can be removed by scrubbers include particulate matter and sulfur dioxide. Unburnt hydrocarbons are not effectively removed by scrubbers.