Magnetic biochar affects the metabolic pathway in methanogenesis of anaerobic digestion of food waste

Abstract

To alleviate pollution and promote clean energy production, food waste can be used to produce methane through anaerobic digestion (AD). In this study, wheat straw was used to produce biochar (BC) and magnetic biochar (MB) as additives for AD of food waste. MB2.5% and BC2.5% led to the highest methane production. The main action mechanism of the additives in AD was the change in environmental factors upon stimulating microorganisms to rapidly metabolize volatile fatty acids. The stimulation of microbial function increased the abundance of the methanogenesis pathways. Methanosarcina was the most dominant archaea in the four methanogenesis modules, and the microbial community changed more clearly with time than with treatment. This study is innovative in finding the effectiveness of BC and MB treatments attributed to the abundance of methanogenesis modules, especially MB2.5% treatment retained its advantage until the later stage of digestion in AD process.

Effects of Magnetic Biochar Addition on Mesophilic Anaerobic Digestion of Sewage Sludge

“…MBC could promote the formation of electroactive bacteria, and not only realize long-distance interspecific electron exchange, but also facilitate microbial adsorption and fixation, form clusters or biofilms, and indirectly mediate the occurrence of DIET, which was beneficial for AD [34,35]. Furthermore, MBC can actively stimulate the activity of enzymes in metabolic pathways during the peak of biogas production [36]. The cumulative biogas production of six reactors is shown in Figure 4b.…”

Solar‐light‐driven ZnO/biochar treatment of pesticides contaminated wastewater: A practical and computational study

“…As a result, BC was prepared from the carbonization of anaerobic sludge generated from the fermentation of agricultural waste and employed in water purification. [21][22][23] The addition of BC during the photodegradation process can improve the overall removal efficiency of target pollutants due to its ability to adsorb the pollutant molecules because of its high surface area, carbon content, and porosity. 24,25 The modification by BC derived from such solid waste material promotes the circular bioeconomy while also lowering overall costs.…”

“…Converting waste bio‐materials into biochar (BC) is also considered an effective negative emission technology for climate change mitigation (Osman, 2022; Fawzy, 2020). As a result, BC was prepared from the carbonization of anaerobic sludge generated from the fermentation of agricultural waste and employed in water purification 21–23 . The addition of BC during the photodegradation process can improve the overall removal efficiency of target pollutants due to its ability to adsorb the pollutant molecules because of its high surface area, carbon content, and porosity 24,25 .…”