Q. Which of the following byproducts can be produced from biogas?
1.Methane
2.Hydrogen
3.Liquefied biogas (LBG)
Select the correct answer from the codes given below;

[A] .2 and 3 only

[B] 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: D
Notes:

Biogas can be converted to produce numerous sustainable transportation fuels.

Methane

The removal of unwanted components like carbon dioxide, hydrogen sulphide and moisture from raw biogas yields pure methane (over 97% content). Some of the common methods to purify biogas include water scrubbing, membrane separation, pressure swing adsorption and adsorption.

Liquefied biogas (LBG)

It is obtained by liquefying the biogas-derived methane by cooling it at -162 degrees Celsius. It has a higher energy density that lowers the storage space requirements of CBG.

At atmospheric pressure, the energy density of liquid methane is roughly 600 times more than that of gaseous methane and 2.5 times greater than that of methane at 250 bar.

Hydrogen

Gasification of biogas is performed by limiting the amount of oxygen and steam present in the reaction and heating the bio-methane to high temperatures (usually over 600°C). As a result of this process, Syngas a mixture of hydrogen and carbon monoxide is created. The hydrogen produced after the removal of carbon monoxide could be used in fuel cells to generate power.

Source: Why producing CBG, LBG, hydrogen, methanol from biogas can be beneficial