Application of Pressure Swing Adsorption for Carbon Dioxide and Methane Enrichment in Biogas Mixture Produced from Animal Manure and Organic Waste

Abstract

Purified biogas is the way to enhance biogas utilization for many applications. Pressure Swing Absorption (PSA) is a promising technique for separating methane from carbon dioxide. The goal of this study is to evaluate the effectiveness of methane and carbon dioxide separation from biogas stream utilizing MSC-3K 172 as adsorbents. Biogas was produced from the anaerobic fermentation of animal manure and organic waste. A 150-liter gas storage tank is connected to a 200-liter gas fermenter tank in a biogas digester. The system has a batch capacity of 0.112 m3 of biogas. To separate methane and carbon dioxide, the PSA technique was used. As solid absorbents, Molecular Sieve (SHIRASAGI MSC 3K-172) were employed. The effect of pressure, flow rate, and time of experiment were investigated. The outcome showed that CO₂ captured behavior is influenced by pressure and flowrate. The fraction of CO₂ captured increases with pressure. The behavior of CO₂ captured is inversely correlated with the gas flow rate. The amount of CO₂ captured increases as the flow rate decreases. The findings indicate that 99.23% of CO₂ may be captured utilizing the PSA technique using molecular sieve (SHIRASAGI MSC 3K-172) as solid absorbents. Methane content in biogas was found to be between 65 and 68 percent; however, after going through the PSA process, the concentration of CH₄ rose to 98.26%. As a result, if the separated methane gas is stored properly, it can be used for a variety of purposes, such as household cooking gas and vehicle fuel.