Cryptogamic Packed Biofilter as Potential Adsorbent for CO₂, NH₃, and H₂S Impurities from Biogas

Figure 1

Preparation of the biofilter: (a) inlet through aeration; (b) gravel packs (200 g); (c) biochar dust (250 nm/100 g); (d) soil substrate (100 g); (e) moss substrate (545 g); (f) filter open.