Use of biochars in anaerobic digestion

Biochar enables anaerobic digestion of aqueous phase from intermediate pyrolysis of biomass

“…Looking at the literature, it was found that chars could enhance the conversion of difficult product in the anaerobic digestion environment. In particular, it is known that char-like materials (like activated carbons or charcoals) can decrease the toxicity of certain inhibitors: like phenols (Hanaki et al, 1997), coal gasification wastewaters (Fox et al, 1990), and ammonia (Mumme et al, 2014). Biochar can partially absorb inhibitors, buffer the pH and provide support for the microorganisms.…”

“…For a detailed study of anaerobic digestion of APL, 100 ml syringe reactors were used, according to the Hohenheimer Biogas Yield Test (Mumme et al, 2014). This allowed to test large number of concentration for APL in a preliminary study and, after that, to follows volatile fatty acids (VFA) concentration and methane production from batch test performed with biochar and nutrients.…”

Producing pipeline-quality biomethane via anaerobic digestion of sludge amended with corn stover biochar with in-situ CO2 removal

“…Although biochar has been investigated as an additive to alleviate NH 3 inhibition in AD processes [16] and to enhance methane yield [17], no systematic research has been conducted on their potential capabilities to achieve in-situ biogas cleanup and upgrading.…”

Production, characterization, and biogas application of magnetic hydrochar from cellulose

“…A well-known problem concerning AD is inhibition of methanogenesis by various mineral or organic compounds such as ammonia, phenols or volatile fatty acids (Chen et al, 2008). Among the range of high adsorptive materials, charcoal or biochar has been reported to mitigate inhibition by ammonia (Kumar et al, 1987;Mumme et al, 2014) and biotoxic pyrolysis products (Torri and Fabbri, 2014). The authors assumed that a higher biogas yield is related to biofilm formation on the particle surface.…”