A Review of Methods Used for Purification of Biogas

Eesha Noor

Department of Chemistry, University of Agriculture Faisalabad, Pakistan

Submitted: 03-08-2025; Accepted: 23-12-2025; Published: 31-12-2025

 

 

Abstract

Biogas produced from the fermentation process of methane contains 59-71% methane with some other components such as water, small quantities of oxygen and nitrogen, hydrogen sulphide, carbon dioxide, and water vapors. Due to these ingredients, the heating value and efficiency of biogas reduces and can also cause corrosion of instruments if used as fuel. Also, gases like CO₂ and H₂S have a very pungent smell and are toxic in nature thus making the food toxic and low quality. These are the reasons why we need to purify biogas. Biogas purification involves removal of CO₂ and H₂S, the toxic gases. The methods we use for purification of biogas involve physical methods, chemical methods, and biological methods. Purified biogas i.e. biomethane is a promising renewable energy which will help in increasing food quality as well as reduce pollution. Purified biogas is a very cost-effective as well as a very good alternative to natural gas.

 

Keywords: biogas, biogas purification, chemical absorption, membrane technology, carbon capture.

Full length article    *Corresponding Author, e-mail: eeshanoor23.en@gmail.com , doi# 10.71111/Science today/1-25-3-3-st-1