摘要：SummaryMicrobial electrosynthesis system (MES) has recently been shown to be a promising alternative way for realizingin situand energy-saving synthesis of hydrogen peroxide (H2O2). Although promising, the scaling-up feasibility of such a process is rarely reported. In this study, a 20-L up-scaled two-chamber MES reactor was developed and investigated forin situand efficient H2O2electrosynthesis. Maximum H2O2production rate of 10.82 mg L−1h−1and cumulative H2O2concentration of 454.44 mg L−1within 42 h were obtained with an input voltage of 0.6 V, cathodic aeration velocity of 0.045 mL min−1mL−1, 50 mM Na2SO4, and initial pH 3. The electrical energy consumption regarding direct input voltage was only 0.239 kWh kg−1H2O2, which was further much lower compared with laboratory-scale systems. The obtained results suggested that the future industrialization of MES technology forin situsynthesis of H2O2and further application in environmental remediation have broad prospects.Graphical AbstractDisplay OmittedHighlights•Up-scaled microbial electrosynthesis with multiple electrodes to synthesize H2O2•The H2O2yield was higher than that of laboratory-scale systems using graphite cathode•Energy consumption was lower than that of laboratory-scale (bio)electrochemical systems•Systematic evaluation of the influence of operating parameters on H2O2productionElectrochemistry; biotechnology; engineering; materials science
