Question

Draw a labelled schematic diagram of a Biogas plant. What use is made of the slurry left behind in a Biogas plant?

Answer 1

Hint: Biogas is produced in anaerobic digesters, which are referred to as Biogas plants. There are five parts to this:
1. The slurry is fed through an intake.
2. The fermentation chamber, which produces biogas through the action of microorganisms.
3. The gas storage tank, which will be used to store the gas produced.
4. The slurry's used slurry outflow,
5. The gas produced is removed through the exit pipe.

Complete answer:
Biogas: is the mixture of gases produced by organic matter in the absence of oxygen (anaerobically), primarily consisting of methane and carbon dioxide.
A biogas plant is an arrangement for creating biogas from animal dung, human excreta, industrial, and home wastes.
Construction of Biogas plant with a fixed dome:
It is made up of a brick and cement subterranean tank that resembles a well. The digester is a tank with intake and exit valves. The tank's roof is designed like a dome. A gas outlet pipe is installed at the top of the dome. The digester's dome serves as a biogas storage tank. A mixing tank is built above ground level and connected to the digester's inlet value via a sloping inlet chamber built below ground level. A rectangular tank called the exit chamber is built on the other side of the digester with bricks and cement. The overflow tank gathers the used slurry and is attached to this output chamber.
The schematic diagram of Biogas plant is shown in below diagram.

Working: In the mixing tank, animal excrement is combined with water to form a slurry. The input chamber is where the slurry enters the digester. The digester is partially filled with slurry, leaving adequate space above it in the dome for biogas collection. The slurry in the digester is permitted to ferment for roughly two months. This action is carried out by anaerobic microorganisms. Biogas is produced as a result of fermentation and collected in the dome. When enough biogas is accumulated in the dome, it exerts a tremendous amount of pressure on the slurry, forcing it to flow into the overflow tank via the exit chamber. The biogas is extracted from the dome through a pipe and used to cook food or heat water as needed.When the biogas plant is up and running, more slurry can be fed into the digester to provide a steady supply of biogas. The used slurry in the overflow tank is high in nitrogen and phosphorus, both of which are necessary for crop and plant growth. As a result, this slurry can be used as manure.

Note:
Biogas is a renewable energy source made possible by the anaerobic decomposition of organic waste by specific microorganisms. Methane, hydrogen, and carbon dioxide are all present in it. Agricultural waste, food waste, animal dung, manure, and sewage can all produce it. Anaerobic digestion is another name for the process of producing biogas.