Biogas is a renewable energy that is produced from organic waste. To enhance the calorific value and better employ the biogas and eliminate undesirable parts from the raw biogas, it is important to upgrade biogas by clean raw biogas so that the cleaned biogas is employed in high effective power generation. In this study, biogas was produced from the vegetable and fruit wastes by employing an anaerobic co-digester. Different process factors like total solids, pH, moisture content, volatile solids, ash content, C:N ratio, and total nitrogen. The water displacement approach was used to measure biogas generation and biogas analyzer approach was used to study methane composition of the product. The wastes were digested for 28 days. The effects of the pH, C/N ratio, and inoculum size on the biogas and methane generation were employed. In this work, chemical absorption approach has been employed to upgrade biogas and to clarify H 2 S and CO 2 of biogas and to enhance the methane content by using NaOH to remove CO 2 , activated carbon to remove H2S, silica gel to remove the moisture. The result showed that the H 2S content was decreased by 87% and CO2 content was reduced 71%. This study confirmed that the upgraded biogas could be employed for electricity generation. Keywords: Biogas, chemical absorption, silica gel, activated carbon, NaOH