Scaling-up of microbial electrosynthesis with multiple electrodes for production of hydrogen peroxide.

Microbial electrosynthesis system (MES) has recently been shown to be a promising alternative way for realizing and energy-saving synthesis of hydrogen peroxide (HO). 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 for and efficient HO electrosynthesis. Maximum HO production rate of 10.82 mg L h and cumulative HO concentration of 454.44 mg L within 42 h were obtained with an input voltage of 0.6 V, cathodic aeration velocity of 0.045 mL min mL, 50 mM NaSO, and initial pH 3. The electrical energy consumption regarding direct input voltage was only 0.239 kWh kg HO, which was further much lower compared with laboratory-scale systems. The obtained results suggested that the future industrialization of MES technology for synthesis of HO and further application in environmental remediation have broad prospects.