The process that provides both energy and manure is

Options

A. Burning of fuel wood
B. Pyrolysis of wood
C. Gasification of wood and wood shavings
D. Biogas formation

Answer

To answer the question "The process that provides both energy and manure is," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Options**: The question provides several options: burning of fuel wood, pyrolysis of wood, gasification of wood, and biogas formation. We need to analyze each option to determine which one provides both energy and manure.

2. **Analyzing Biogas Formation**:
- Biogas formation occurs in a biogas plant where organic waste, such as household waste and biowaste, is decomposed anaerobically (without oxygen).
- During this process, biogas is produced, which is primarily composed of methane and can be used as a renewable source of energy.

3. **Energy Production**:
- The biogas produced can be burned to release energy, making it a clean and renewable fuel source. This energy can be used for cooking, heating, and even electricity generation.

4. **Manure Production**:
- After the biogas is extracted, the remaining material, known as digestate, can be used as manure. This digestate is rich in nutrients and can be applied to agricultural fields to improve soil fertility.

5. **Conclusion**:
- Based on the analysis, biogas formation is the process that provides both energy (in the form of biogas) and manure (in the form of digestate). Therefore, the correct answer is biogas formation.

### Final Answer:
The process that provides both energy and manure is **biogas formation**.

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