We Provide PSA/VPSA based Bio Gas Purification Plant. The bio Gas contains normally 40-60% methane and rest being CO2 and N2. For getting the enrichment of methane to convert it into comparable to Natural gas CO2 & N2 has to be taken out from Bio Gas. For this we provide PSA based twin Tower adsorption system. This purifies the Bio Gas to methane 92-98% pure. This is a fully automatic system and manless operation. In this system Bio Gas is compressed and passed over Molecular Sieve where CO2 & N2 is adsorbed and pure methane with 92-98% purity is obtained.