Based on the findings of the subtask 4.6, an existing two-phase AD pilot plant will be retrofitted in terms of coupling a MEC system to develop a novel reactor model with the configuration more adequate for maximizing biomethane production. It will consume the CO₂ produced during the anaerobic digestion process by in situ reaction with the H₂ generated by a MEC unit located inside the system, in order to obtain enriched biogas.

The existing plant is a mobile two-phase AD pilot plant constructed in the frame of the project LIFE VALUVOIL and retrofitted during the project LIFE REVAWASTE to work with waste with a high solid content (e.g. agricultural or food waste). The unit is installed in a container and includes a sonication equipment as pretreatment (optional use), an homogenization tank (0.5 m³), a continuous stirred tank acidification reactor (700mm high and 450mm inner diameter, 0.1 m³), a stirred tank methanogenic reactor (1,200mm height and 800mm inner diameter, 0.5 m³) and a biogas collecting system. The system is equipped with internal regulators, temperature and pressure sensors, temperature and pH control, variable speed mixing system and gas flow meter. The tailor-made MEC will be introduced in one of the digesters.