Question

During sewage treatment, biogas produced includes
A) Methane, Oxygen, Hydrogen sulphide.
B) Hydrogen sulphide, Methane, Sulphur oxide.
C) Hydrogen sulphide, Nitrogen, Methane.
D) Methane, Hydrogen sulphide, Carbon-di-oxide.

Answer 1

Hint: Sewage treatment is a sort of wastewater management that strives to clean sewage of pollutants. Sewage consists of wastewater from residential and commercial applications, as well as perhaps post industrial waste. Organic fertilizer, urban litter, plant matter, food scraps, effluent are some of the waste products that decompose into biogas.

Complete answer:
Option D Methane, hydrogen sulphide, carbon-di-oxide: Anaerobic decomposition or thermochemical transformation of biomass produces biogas, which is a gaseous power. Biogas is a mixture of methane, hydrogen sulphide and carbon-dioxide.
So, option D is correct.
Option A Methane, Oxygen, Hydrogen Sulphide: Biogas is composed of methane and hydrogen sulphide but not oxygen.
Option A is not correct.
Option B Hydrogen sulphide, Methane, Sulphur oxide: Biogas consists of hydrogen sulphide and methane. But, it is not made up of Sulphur oxide.
Option B is not correct.
Option C Hydrogen sulphide, nitrogen and methane: Hydrogen sulphide, methane are present in biogas. But, Nitrogen is not a product of biogas.
Option C is not correct.

Hence, option D is the correct answer.

Additional information:
Bio-methane is created when biogas is treated and refined to natural gas norms, and it can be employed in the same way as methane for fuelwood.

Note:
Biogas is a renewable energy source that is good for the environment. It’s made when microbes break down organic stuff like food or animal waste in the absence of oxygen, a process known as anaerobic digestion. When in a compressed state, biogas can be utilized as a motor fuel.