Supply of oxygen to the biogas plant will have

Options

A. Positive effect
B. Negative effect
C. No effect
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Biogas Production**:
- Biogas is produced in a biogas plant through the anaerobic digestion of organic matter, primarily animal dung and agricultural waste.

2. **Role of Anaerobic Conditions**:
- The process of biogas production requires anaerobic conditions, meaning that it occurs in the absence of oxygen. This is crucial because the bacteria involved in this process, specifically methanogens, thrive in such environments.

3. **Components of Biogas**:
- The main components of biogas are methane (CH4) and carbon dioxide (CO2). Methane is the combustible part of biogas, making it a valuable renewable energy source.

4. **Effect of Oxygen Supply**:
- Introducing oxygen into the biogas plant disrupts the anaerobic conditions necessary for methanogens to function effectively. This can inhibit the production of biogas, leading to a decrease in methane yield.

5. **Evaluating the Options**:
- Given the understanding that oxygen has a negative impact on the biogas production process, we can evaluate the provided options:
- Positive effect: Incorrect, as oxygen is detrimental to methanogen activity.
- Negative effect: Correct, as oxygen disrupts the anaerobic conditions required for biogas production.
- No effect: Incorrect, as oxygen does have a significant effect.
- None of these: Incorrect, as the negative effect is the correct answer.

6. **Conclusion**:
- The correct answer is that the supply of oxygen to the biogas plant will have a negative effect on the production of biogas.