Stimulation of the anaerobic digestion of the dry organic fraction of municipal solid waste (OFMSW) with carbon-based conductive materials

Addition of biochar and trace elements in the form of industrial FeCl3 to stabilize anaerobic digestion of food waste: dosage optimization and long‐term study

“…DIET is a faster and more efficient route for electron transfer than mediated interspecies electron transfer and, as molecular hydrogen is no longer formed, VFA oxidation is thermodynamically independent of its concentration . Materials such as granular activated carbon (GAC), carbon cloth or magnetite have been found to favor VFA consumption and methane production during AD . Among them, GAC appears to be a particularly well‐performing alternative that has been found to promote the consumption of HAc, HBu and HPr during AD of dog‐food waste and FW.…”

“…22,24 Materials such as granular activated carbon (GAC), carbon cloth or magnetite have been found to favor VFA consumption and methane production during AD. [25][26][27][28] Among them, GAC appears to be a particularly well-performing alternative that has been found to promote the consumption of HAc, HBu and HPr during AD of dog-food waste and FW. 22,26,29 However, both TEs and GAC are expensive and their application at an industrial scale is far from being feasible.…”

“…[25][26][27][28] Among them, GAC appears to be a particularly well-performing alternative that has been found to promote the consumption of HAc, HBu and HPr during AD of dog-food waste and FW. 22,26,29 However, both TEs and GAC are expensive and their application at an industrial scale is far from being feasible. Thus, cheaper alternatives must be found.…”

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

“…Lee et al [13] demonstrated the applicability of GAC to facilitate DIET-mediated methanogenesis in continuous mode and this improvement was associated with the enrichment of primarily exoelectrogens and hydrogenotrophic methanogens in biomass attached to the GAC. Very few studies have demonstrated the effect of GAC addition on complex wastes instead of on artificial mono-substrates, including the use of commercial dog food as a substitute for dry organic fraction of municipal solid waste (OFMSW) and waste activated sludge (WAS) [67][68][69]. All of them observed that accelerated digestion rate and growth of putative DIET participants were stimulated; therefore, all proposed that conductive GAC can be used as an effective electron transfer mediator even in real wastewater streams.…”

“…Recently, carbon cloth [65,67,68] and carbon felt [67,73] have been used as conductive materials to facilitate DIET in mixed-culture environments. A recent study has reported that carbon cloth has a beneficial effect on the inhibiting condition caused by the acidic impact and high hydrogen partial pressure in anaerobic digesters [74].…”