The use of biogas as a fuel directly use often problem occur that is awful odor, equipment fast burner and rusted metal, kitchen walls eroded and fire often turns off its self. This is due in a biogas other than methane (CH4) contained other gases, H2S, NH3, CO2, H2, CO and water vapor (H2O). Some gases which are impurities (H2S, NH3, CO2 and water vapor/H2O) will lower the value of calories from biogas and detrimental to the environment and health. The purpose of this research is to eliminate impurities from gases biogas through a process of purification until obtained biogas which has higher heat value and enviromental friendly. The Methods undertaken by adsorption process using adsorbent activated carbon with variable time contacts, to obtain the optimum adsorption power of activated carbon toward gas impurities that are present in wastewater. The results of this research were obtained data removal/reduction of H2S gas impuritis achieve 99.99%, from 4200 ppm to be 0.22 ppm NH3 gas removal, reach the 12.7%, from 94,96 ppm be 0.65 ppm, removal of CO2 gas reached 77.48%, from levels 30, 77% to 6.93%, removal of water vapour (H2O) reached 97,95%, from 0.584 mg/l be 0.012 mg/l.The increase in the concentration of methane (CH4) from 38.2% to 84.12%. Results of methane (CH4) as a result of this biogas is renewable energy sources that are safe and environmentally friendly and can be developed in other Tofu IKM. The Time saturated activated carbon adsorbents obtained after 48 hours, the process of purification occur. Optimum active Carbon adsorption power towards each component gas impuritis is as follows against the H2S is 10.98 mg H2S/gram of activated carbon/minute, against the NH3 is 0.016 mg NH3/gram of activated carbon/minute, against CO2 is 0.090mg activated carbon/gram CO2/minute.The impact when biogas is not utilized and left aside in the air, then it can trigger the effect of greenhouse gases and global warming due to biogas containing gases CH4 and CO2 are a very significant number.