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This BES study investigates . Key performance metrics include voltage output.

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Abstract

This study evaluates the energy efficiency and trade-offs of a sidestream bioelectrochemical anaerobic digestion (SBEAD) system compared to conventional anaerobic digestion (AD). Both reactors were operated in sequencing batch mode under mesophilic conditions, with a low voltage of 0.4 V applied to SBEAD. Experiments were conducted across four organic loading rates (OLRs): 2, 3, 4, and 6 kg-COD/m3/day. At OLRs of 3 kg-COD/m3/day or lower, methane production and energy efficiency were comparable between AD and SBEAD. However, at higher OLRs, SBEAD demonstrated superior methane production and overall energy recovery, while AD performance deteriorated due to acidification. Specifically, at 6 kg-COD/m3/day, SBEAD achieved an energy efficiency of 63.8 ± 3.5%, compared to 23.1 ± 12.4% for AD. A novel metric, the Methane Gain Index (MGI), was analyzed, with SBEAD achieving MGI values exceeding 50 kJ/kJ at low OLRs and reaching 585.3 kJ/kJ at high OLRs. Additionally, microbial community analysis indicated that SBEAD favored the abundance of species that enhance substrate degradation and methane production. These findings suggest that SBEAD is a scalable strategy for treating high-strength organic waste in waste-to-energy systems.

Keywords

Anaerobic digestionMethaneMesophilePulp and paper industryAnaerobic exerciseWaste management

Identifiers

DOI
10.3390/w17243497
Journal
Water
Year
2025