Biogas production from waste biomass with the help of methanogenic bacteria is

Options

A. one-step process
B. two-step process
C. three-step process
D. multi step process

Answer

To answer the question regarding biogas production from waste biomass with the help of methanogenic bacteria, we need to understand the steps involved in this process. Here’s a detailed breakdown:

### Step-by-Step Solution:

1. **Understanding Biogas Production**:
Biogas is primarily composed of methane and is produced from the anaerobic digestion of organic matter, such as waste biomass. Methanogenic bacteria play a crucial role in this process.

2. **Identifying the Steps Involved**:
The production of biogas from waste biomass involves multiple steps. These steps can be categorized as follows:

- **Step 1: Hydrolysis**
- In this initial step, complex organic materials (like carbohydrates, fats, and proteins) are broken down into simpler compounds (sugars, fatty acids, and amino acids) by the action of hydrolytic enzymes.

- **Step 2: Acidogenesis**
- The simple compounds produced during hydrolysis are then converted into volatile fatty acids, hydrogen, and carbon dioxide by acidogenic bacteria. This process is known as acidogenesis.

- **Step 3: Acetogenesis**
- In this step, the volatile fatty acids and alcohols produced in the previous step are further converted into acetic acid, along with additional hydrogen and carbon dioxide, by acetogenic bacteria.

- **Step 4: Methanogenesis**
- Finally, methanogenic bacteria convert the acetic acid and hydrogen produced in the previous steps into methane and carbon dioxide. This is the final step where biogas is produced.

3. **Conclusion**:
Since biogas production involves four distinct steps (hydrolysis, acidogenesis, acetogenesis, and methanogenesis), it is categorized as a multi-step process. Therefore, the correct answer to the question is option D: multi-step.

### Final Answer:
The biogas production from waste biomass with the help of methanogenic bacteria is a **multi-step process**.

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