Upgrading of Biogas Generated from Shrimp Processing Effluent Using Vacuum Pressure Swing Adsorption

In this study, a field study was presented on upgrading the biogas generated from shrimp processing wastewater (sfw‐biogas) that had H2S of 5000–6000 ppm, CO2 13–32 %, and CH4 68–87 % using the oxidative absorption of H2S in iron‐chelated solution in series with vacuum pressure swing adsorption (VPSA). The regeneration of the adsorbent treating sfw‐biogas required a shorter evacuation time than that of treating the biogas with a typical composition of 60 % CH4 (t‐biogas). The VPSA process treating sfw‐biogas required half the evacuation time and 26 % lower energy consumption. However, the methane recovery decreased from 80 % for t‐biogas to 65 % for sfw‐biogas.