in which stage of sewage treatment is desallination and chlorination of water done ?

Options

A. Primary tratment
B. secondary treatment
C. Tertiary treatment
D. Both (1) and (2)

Answer

**Step-by-Step Solution:**

1. **Understanding Sewage Treatment**: Sewage treatment involves the process of treating wastewater from households and industries before it is released into water bodies. It is essential to remove harmful substances to protect the environment.

2. **Stages of Sewage Treatment**: There are three main stages in sewage treatment:
- **Primary Treatment**: This stage focuses on the physical removal of solid waste. Wastewater is allowed to settle, separating heavier solids that sink and lighter materials that float.
- **Secondary Treatment**: This stage involves biological processes to remove dissolved organic matter and pathogens. It employs microorganisms to break down these substances.
- **Tertiary Treatment**: This is the final stage where the treated water undergoes further purification. It is crucial for ensuring that the water is safe for discharge into the environment.

3. **Desalination and Chlorination**: These processes are part of the tertiary treatment.
- **Desalination**: This process removes salts and other impurities from water, making it suitable for discharge or reuse.
- **Chlorination**: This is a chemical disinfection method used to kill harmful bacteria and pathogens in the water.

4. **Conclusion**: Both desalination and chlorination are performed during the tertiary treatment stage of sewage treatment. This stage ensures that the water is safe for release into natural water bodies.

**Final Answer**: The processes of desalination and chlorination are done in the tertiary treatment stage of sewage treatment.

---