Question

Which of the following is a type of biogas plant?
This question has multiple correct options
A. Fixed dome type
B. Floating gas holder type
C. Fixed fuel type
D. Moving chamber type

Answer 1

Hint: The are type of biogas plant which contains an immovable, rigid gas-holder and displacement pit. In another type, the gas holder is not fixed and it is moveable which remains over the slurry inside the digester tank.

Complete answer:
To begin with, we will discuss something about biogas plants.
Biogas: Biogas is a mixture of gases produced in the absence of oxygen (anaerobic) by the breakdown of organic matter, consisting primarily of methane and carbon dioxide. Raw materials such as agricultural waste, fertilizer, municipal waste, plant material, sewage, green waste or food waste can be used to generate biogas. Biogas is an energy source that is renewable. It is also known as "Gobar Gas" in India. Biogas is created by methanogenic or anaerobic digestion by anaerobic organisms that digest material in a closed system or ferment biodegradable materials. An anaerobic digester, bio digester or bioreactor is named this closed system.

A fixed-dome plant is made up of a closed, dome-shaped digester with an immovable, solid gas-holder and a ‘compensation tank’ displacement pit. In the upper portion of the digester, the gas is stored. For the collection of biogas, the floating gas holder type biogas plant consists of a dome shaped gas holder made of steel. The dome-shaped gas holder is not fixed but is moveable and floats in the digester tank over the slurry current. There are two types of biogas plants: fixed dome type and floating gas holder type.

The correct options are A and B.

Note: Biogas is a fuel source that has the potential to provide the planet with decent energy as a reasonably inexpensive source of electricity. In areas where there is no access to electricity, deforestation is the result of trees being cut down and used as fuel for fires.