Question

(a) Bio-mass contains stored energy. Justify it.
(b) How does bio-gas plant help to reduce the problem of pollution?

Answer 1

Answer:

(a) bio-mass contains stored energy as:

(i) Biomass (animal and plant products) is used to form biogas

(ii) Biomass does not have a good heating capacity, it produces a lot of smoke

Cow dung, various plant materials like residue after harvesting the crops, vegetable waste and sewage are decomposed in the absence of oxygen to give biogas

Biogas is stored, and drawn through pipes for use

It is an excellent fuel, gaseous state, non-polluting and high heating capacity

The slurry left behind can be used as manure, rich in nitrogen and phosphorus

(b) Biogas reduces pollution in the following ways:

It burns without smoke, leaves no residue like ash in wood, charcoal and coal burning.

It provides a safe and efficient method of waste disposal, besides supplying energy and manure.

Answer 2

Bio-mass

Explanation:

Bio-mass contains stored energy:

Biomass is nothing but animal and plant waste, which releases biogas when decomposed.  Biogas is used as fuel.

Bio-gas plants help reduce the problem of pollution:

1. Animal and plant waste materials are decomposed in the absence of oxygen to produce biogas. This biogas is stored and transferred through pipes for use.
2. The slurry left behind can be used as manure as it is rich in nitrogen and phosphorus.

Thus bio-gas plants act as efficient ways of waste disposal and also produce low-cost fuel at the same time.