Question

Pollution from animal excreta and organic waste from kitchen can be most profitably minimised by
A. Storing them in underground storage tank
B. Using them for producing biogas
C. Vermiculture
D. Using them directly as biofertilizers

Answer 1

Hint: Biogas is a composition of gaseous molecules which is produced by the metabolism of organic compounds in the absence of oxygen resulting in the formation of methane and carbon dioxide, here methane is a flammable component. Biogas utilisation is considered to be one of the remedial measures to control the use of petroleum gases for domestic purposes by controlled uses of biogas.

Complete Answer:
- Storing animal excreta and organic water in underground tanks will definitely be waste since there is no utilisation of products formed from it.
- Vermiculture is a branch of agriculture practice which focuses on the culture of earthworms which will increase the fertility of soil for vegetation that has nothing to do with pollution and utilisation of animal excreta and animal waste.
- Biofertilizers are biomannure which consist of microorganisms which can create symbiotic association with the crops, animal and organic waste won’t fulfill the requirement as fertiliser.

So the correct answer is option B.

Note: Biogas is produced by anaerobic breakdown of organic matter which is present in kitchen waste and animal excreta which consist of various components such as methane which is about 50%-80% and carbon dioxide which is about 30%-60% there two gases are the major components for the properties of biogas which is produced by breakdown of carbohydrates and other carbon rich sources, their is also nitrogen, ammonia, hydrogen sulphide in lower amounts which is produced by the breakdown of amino acids and other nitrogen rich sources.