Biological Co-treatment of HS and reduction of CO to methane in an anoxic biological trickling filter upgrading biogas.

This study investigated the feasibility of co-treating HS and CO in a biological trickling filter (BTF) inoculated with hydrogenotrophic methanogens (HMs) and nitrate-reducing, sulfur-oxidizing bacteria. This was accomplished by introducing a pure culture of Thiobacillus denitrificans in a BTF that was successfully upgrading a biogas mimic (60:40 CH:CO) to >97% methane using an enriched HM consortium. Nitrate was fed as the electron acceptor to oxidize HS.

Detailed investigations of dissolved hydrogen and hydrogen mass transfer in a biotrickling filter for upgrading biogas.

This study investigated the hydrogen mass transfer limitations in a biotrickling filter inoculated with hydrogenotrophic methanogens for biogas upgrading. A highly sensitive dissolved hydrogen probe allowed measuring concentrations in real-time. Experiments were conducted to test the mass transfer resistance in the gas and liquid films.

High-Performance Biogas Upgrading Using a Biotrickling Filter and Hydrogenotrophic Methanogens.

This research reports the development of a biotrickling filter (BTF) to upgrade biogas, which is achieved by adding H to reduce CO. H and CO (80:20% vol.) were fed to a bench-scale BTF packed with polyurethane foam (PUF) and inoculated with hydrogenotrophic methanogens.