True/false
Sediment which treated with bacterial flocs is called activated sludge

Answer

To determine whether the statement "Sediment which treated with bacterial flocs is called activated sludge" is true or false, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sewage Treatment**:
- Sewage treatment involves two main processes: primary treatment and secondary treatment.
- Primary treatment focuses on physical processes to remove large debris from sewage.

2. **Identifying Secondary Treatment**:
- Secondary treatment involves biological processes where microbial activity is utilized to break down organic matter in the sewage.
- This is where bacterial flocs come into play.

3. **Defining Bacterial Flocs**:
- Bacterial flocs are clusters or colonies of bacteria that are suspended in water.
- These bacteria consume organic nutrients present in the sewage, aiding in its purification.

4. **Understanding Activated Sludge**:
- The term "activated sludge" refers to the mixture of sewage and bacterial flocs that is aerated during the secondary treatment process.
- This mixture helps in the breakdown of organic materials, resulting in cleaner water.

5. **Analyzing the Statement**:
- The statement claims that sediment treated with bacterial flocs is called activated sludge.
- In the context of sewage treatment, the sediment (or sludge) that results from the treatment with bacterial flocs is indeed referred to as activated sludge.

6. **Conclusion**:
- Since the statement accurately describes the process and terminology used in sewage treatment, we conclude that the statement is **True**.

### Final Answer:
**True**: Sediment which treated with bacterial flocs is called activated sludge.