Lab-scale (4 pairs of 5 L reactors) and pilot-scale (mobile 800 L reactors installed in a transportable container) setups for biological methanation using LIST-patented dense membrane gas capture reactor technology. The containerized pilot system can be easily relocated between full-scale units or farm sites for on-site testing under real operational conditions. These systems enable precise control and optimization of gas–liquid transfer for enhanced CO₂ and H₂ conversion efficiency, while their modular design supports integration with diverse microbial consortia, real-time monitoring of gas fluxes and methane yields, and coupling with upstream or downstream bioprocesses for complete carbon recycling.