Which of the following is not used in the treatment of polluted water ?

Options

A. Activated carbon
B. Trikling filter method
C. cyclone collector
D. Activated sludge method

Answer

To determine which of the following options is not used in the treatment of polluted water, we will analyze each option provided:

1. **Activated Carbon (Option A)**:
- Activated carbon is commonly used in water treatment processes. It acts as an adsorbent, removing organic compounds and impurities from water through a chemical process. Therefore, this option is used in the treatment of polluted water.

2. **Trickling Filter Method (Option B)**:
- The trickling filter method is a biological treatment process that uses microorganisms to break down organic matter in sewage. It is a well-established method in wastewater treatment. Hence, this option is also used in the treatment of polluted water.

3. **Cyclone Collector (Option C)**:
- A cyclone collector is a device primarily used for air pollution control. It works by removing particulate matter from the air, not from water. Therefore, this option is not used in the treatment of polluted water.

4. **Activated Sludge Method (Option D)**:
- The activated sludge method is another biological treatment process that involves aerating sewage to promote the growth of bacteria that decompose organic matter. This method is widely used in wastewater treatment facilities. Thus, this option is used in the treatment of polluted water.

Based on the analysis, the correct answer is **C. Cyclone Collector**, as it is not used in the treatment of polluted water.