Question

Examine the importance of Bio-gas energy in rural areas.

Hint:

Build the answer around the raw material used, the higher thermal efficiency, the improved manure left behind, the trees and dung that are saved, and the health benefit of a smokeless kitchen.

Answer 1

Concept:

• Biogas is produced by the decomposition of organic matter such as shrubs, farm waste, and animal and human waste.
• In rural India it replaces firewood, dung cakes and kerosene, all of which are either scarce, costly or harmful.

Step 1: It uses waste that is already available in the village.
Shrubs, farm waste, animal waste and human waste are used to produce biogas for domestic consumption in rural areas. The raw material costs nothing and is produced in every household that keeps cattle.

Step 2: It burns better than the fuels it replaces.
The gas obtained by decomposition of organic matter has higher thermal efficiency in comparison with kerosene, dung cake and charcoal. A family therefore gets more heat from the same quantity of raw material.

Step 3: It gives the farmer a second benefit, better manure.
Biogas plants are set up at municipal, cooperative and individual levels, and the plants using cattle dung are known as Gobar gas plants in rural India.
These provide twin benefits to the farmer in the form of energy and improved quality of manure, since what remains after the gas is drawn off is a richer fertiliser than raw dung.

Step 4: It saves trees and saves manure.
Biogas is by far the most efficient use of cattle dung. It improves the quality of manure and also prevents the loss of trees and manure due to the burning of fuel wood and cow dung cakes.
Forests near villages are spared, and dung goes back to the field instead of up in smoke.

Step 5: It improves health and living conditions.
Cooking on firewood and dung cakes fills a kitchen with smoke, which harms the eyes and lungs of the women who cook. A clean gas flame removes that smoke, and the time spent collecting firewood is saved for other work.

Final Answer: Biogas matters in rural areas because it turns free local waste into a clean, efficient fuel, returns a better manure to the field, saves both trees and dung from being burnt, and gives rural households a smokeless kitchen.