Authors: Alexandros Chatzis, Maria Gaspari, Konstantinos N. Kontogiannopoulos, Davide Sanguineti, Guido Zampieri, Anastasios I. Zouboulis, Panagiotis G. Kougias

This study evaluates the impact of different packing materials on the performance of trickle bed reactors used for biological CO2 methanation. Raschig Rings allowed a successful reduction in gas retention time at 25 min with >95% CH4 purity, while biochar showed low efficiency. Switching to manure as a nutrient solution enhanced methane production rates, and hydrogenotrophic Methanothermobacter spp. dominated all reactor communities.

Read the full article: https://doi.org/10.1016/j.jece.2025.119480