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Identify the True or False statements ab...

Identify the True or False statements about the sewage treatment plants.
I. The water is less polluted if BOD is high.
II. Flocs are formed by anaerobic bacteria with fungal filaments in mesh-like structures.
III. Activated sludge acts like an inoculum in activated sludge digesters.
IV. In activated sludge digesters, gases like methane, hydrogen sulphide and carbon dioxide are formed.

A

I - False , II - True , III - True , IV - True ,

B

I - True , II - False , III - True , IV - True

C

I - False , II - False , III - False , IV - True

D

I - True , II - False , III - False , IV - False

Text Solution

AI Generated Solution

The correct Answer is:
To determine the truthfulness of the statements regarding sewage treatment plants, we will analyze each statement one by one. ### Step-by-Step Solution: 1. **Statement I: The water is less polluted if BOD is high.** - **Analysis:** Biological Oxygen Demand (BOD) is a measure of the amount of organic matter in water. A high BOD indicates a high level of organic pollution because it means that there is a lot of organic material that bacteria need to decompose. Therefore, if BOD is high, the water is more polluted, not less. - **Conclusion:** This statement is **False**. 2. **Statement II: Flocs are formed by anaerobic bacteria with fungal filaments in mesh-like structures.** - **Analysis:** Flocs are aggregates of bacteria and other microorganisms that form during the sewage treatment process, particularly in the presence of aerobic bacteria, not anaerobic bacteria. The formation of flocs is essential for the secondary treatment of sewage, where aerobic bacteria oxidize organic matter. Thus, this statement is incorrect. - **Conclusion:** This statement is **False**. 3. **Statement III: Activated sludge acts like an inoculum in activated sludge digesters.** - **Analysis:** Activated sludge is indeed used as an inoculum in sewage treatment processes. It contains a mixture of microorganisms, including aerobic bacteria, which help in breaking down organic matter. However, the statement implies that activated sludge acts as an inoculum in the digesters, which is misleading as digesters primarily function under anaerobic conditions. Therefore, while activated sludge is crucial for treatment, its role as an inoculum in digesters is not accurate. - **Conclusion:** This statement is **False**. 4. **Statement IV: In activated sludge digesters, gases like methane, hydrogen sulphide, and carbon dioxide are formed.** - **Analysis:** This statement is true. During the anaerobic digestion process, microorganisms break down organic matter, resulting in the production of biogas, which includes methane, hydrogen sulfide, and carbon dioxide. This is a well-known outcome of anaerobic digestion in sewage treatment. - **Conclusion:** This statement is **True**. ### Final Summary: - Statement I: **False** - Statement II: **False** - Statement III: **False** - Statement IV: **True** Thus, the only true statement is Statement IV.
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