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Prof. Lucy Melchi
Central Michigan University

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Journal article
Published: 24 August 2021 in Sustainability
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Due to its high water and organic contents, management of apple pomace (AP) poses several waste management challenges on the apple juice and cider producing industries. Bioconversion of AP into biogas provides an excellent possibility to reduce the environmental challenge faced in the management of AP waste along with producing renewable energy in the form of methane. This study investigated the effect of carbon-based conductive materials (biochar and graphene) and trace metals supplementation to improve biogas production from AP. The results indicate that supplementation of biochar, trace metals, and graphene significantly improves the biogas production from AP. Trace metal and biochar supplementation at a COD concentration of 6000 mg/L resulted in 7.2% and 13.3% increases in the biogas production, respectively. When trace metals and biochar were supplemented together, the biogas production increased by 22.7%. This synergistic effect was also observed at the COD concentration of 12,000 mg/L. The improvement in the biogas formation was significantly higher for graphene supplemented reactors (27.8%). Moreover, biochar and trace metals supplementation also led to 19.6% and 23.0% increases in the methane yield relative to the reactor fed only with AP, respectively. These results suggest anaerobic digestion supplemented with carbon-based conductive materials and trace metals is a viable option for valorizing apple pomace.

ACS Style

Addam Claes; Lucy Melchi; Sibel Uludag-Demirer; Goksel N. Demirer. Supplementation of Carbon-Based Conductive Materials and Trace Metals to Improve Biogas Production from Apple Pomace. Sustainability 2021, 13, 9488 .

AMA Style

Addam Claes, Lucy Melchi, Sibel Uludag-Demirer, Goksel N. Demirer. Supplementation of Carbon-Based Conductive Materials and Trace Metals to Improve Biogas Production from Apple Pomace. Sustainability. 2021; 13 (17):9488.

Chicago/Turabian Style

Addam Claes; Lucy Melchi; Sibel Uludag-Demirer; Goksel N. Demirer. 2021. "Supplementation of Carbon-Based Conductive Materials and Trace Metals to Improve Biogas Production from Apple Pomace." Sustainability 13, no. 17: 9488.