微生物反向电渗析反应器产过氧化氢的研究

微生物反向电渗析(Microbial reverse-electrodialysis electrolysis cell, MREC)是一种通过微生物产生的电能与浓淡水盐差能耦合形成的一种新型的生物电化学技术.本文对MREC阴极回收H_2O_2的运行条件与影响因素及同步产能效应进行了研究.结果表明,浓淡水流速及浓度比是影响H_2O_2产生的关键因素.在浓淡水流速为2 mL·min~(-1)、浓/淡水比为100时,MREC可以获得最大H_2O_2产量711.4 mg·L~(-1),产H_2O_2速率达到最大33.65 mg·L~(-1)·h~(-1),阴极回收率为19.77%.同时,对应的产电性能达到1.25 W·m~(-2).MREC反应器能够在无需施加外界能源的情况下获得较高的H_2O_2产量,为H_2O_2绿色生产提供了一条新思路.

Microbial reverse-electrodialysis electrolysis cell for effective production of hydrogen peroxide

Microbial reverse-electrodialysis electrolysis cell (MREC) is a new type of bioelectrochemical technology which is developed by coupling electrical energy generated by microorganisms with salinity-gradient energy between seawater and freshwater. In this study, a MREC was established aiming to produce H₂O₂ in the cathode chamber. The effects of operating conditions and influencing factors on H₂O₂ generation and power generation were investigated. The results show that the flow rate of seawater and freshwater and the salinity gradient were the key factors influencing the production of H₂O₂. The maximum H₂O₂ production, 711.4 mg·L^-1, was obtained when the flow rate of Seawater and Freshwater was 2 mL·min^-1 and the concentration of Freshwater was 0.35 g·L^-1. Under this condition, the H₂O₂ production rate also reached a maximum value of 33.65 mg·L^-1·h^-1, and the cathode recovery rate was 19.77%. Correspondingly, the power density reached 1.25 W·m^-2. The MREC reactor can obtain a high H₂O₂ production rate without applying external energy, which provides a new route for green production of H₂O₂.