Question

The slurry from a biogas plant is used as a

• A. Form oil
• B. Fertilizer
• C. Sanitary usage
• D. Fabric filter

Hint:

Outputs of a biogas plant: \[ \boxed{ \begin{aligned} \text{Biogas} &\rightarrow \text{Fuel}\\ \text{Digested Slurry} &\rightarrow \text{Organic Fertilizer} \end{aligned} } \]

Answer 1

The Correct Option is B

Step 1: Recall the two outputs of a biogas plant.
Anaerobic digestion of cattle dung or organic waste in a biogas plant produces gas, mostly methane, and a left over digested slurry.
Step 2: Look at what the slurry contains.
This slurry is rich in nitrogen, phosphorus and potassium along with other micronutrients, since digestion breaks down organic matter but conserves these plant nutrients.
Step 3: Match the use.
Because of this nutrient content, the slurry is applied to farmland as an organic fertilizer rather than being used as an oil, filter, or purely sanitary material.
\[ \boxed{\text{Fertilizer}} \]