By H2 recycling venting during the purification is avoided, which leads to a significantly reduced overall H2 loss (see Table ), without compromising neither the required conversion for the set methane production rate nor the fuel purity (see Table ). From the standpoint of resource efficiency, it is advantageous to achieve the set production and purity target with smaller 𝑟 in values while maintaining the same CO₂ inlet molar flow rate. Therefore, using a recycle stream renders the RO beneficial in terms of resource consumption, while additional equipment is needed.