Biogas is a renewable energy source that is produced by the anaerobic digestion of organic matter such as food waste, agricultural waste, and sewage sludge. Biogas is primarily composed of methane (CH4) and carbon dioxide (CO2), but it may also contain small amounts of other gases such as hydrogen sulphide (H2S), water vapour, and nitrogen.
Hydrogen sulphide is a toxic gas that is commonly found in biogas and can be harmful to the environment and human health.
Chemical wet scrubbers: Wet scrubbers are a common method for removing hydrogen sulfide from biogas. The process involves passing the biogas through a liquid absorbent, which reacts with the hydrogen sulfide and removes it from the gas stream. The most common absorbents used for this purpose are aqueous solutions of sodium hydroxide (NaOH) or monoethanolamine (MEA). The main disadvantage of chemical absorption is the high cost due to the large amount of absorbent required.
