Wastewater treatment generates a large quantity of sludge, which can be treated by

Options

A. an aerobic digesters
B. floc
C. chemicals
D. oxidation pond

Explanation

**Step-by-Step Solution:**

1. **Understanding the Problem**: The question asks about the treatment of sludge generated from wastewater treatment processes. Sludge is a byproduct that needs to be processed to reduce its volume and toxicity.

2. **Identifying Treatment Methods**: One of the primary methods for treating sludge is through aerobic digestion. This process involves the use of microorganisms to break down organic matter in the sludge.

3. **Explaining Aerobic Digesters**: Aerobic digesters are large, heated tanks where the sludge is treated. In these tanks, aerobic bacteria (which require oxygen) decompose the organic material present in the sludge.

4. **Process of Aerobic Digestion**: In aerobic digestion, the bacteria break down the organic matter, which results in the reduction of sludge volume and the production of biogas (a mixture of methane and carbon dioxide). This process is efficient and environmentally friendly.

5. **Further Treatment**: After the initial breakdown in aerobic digesters, the treated liquid may be sent to oxidation ponds. In these ponds, heterotrophic bacteria continue the breakdown process, and solar UV light helps to eliminate harmful bacteria.

6. **Conclusion**: The correct answer to the question is that sludge generated from wastewater treatment can be treated by aerobic digesters.

**Final Answer**: The sludge can be treated by aerobic digesters.

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