초록
<P><B>Abstract</B></P> <P>The aim of this study was to develop an efficient bioanode microbial electrosynthesis system (MES) to convert carbon dioxide into acetate using bioenergy from the wastewater. The bioanode MESs were constructed using proton exchange membrane (PEM) and bipolar membrane (BPM) as separator, respectively, and operated under different voltages (i.e., 0.8, 1.0, 1.2, and 1.4V). Since BPM could dissociate H<SUB>2</SUB>O into H<SUP>+</SUP> and OH<SUP>−</SUP> in situ to buffer the pH change in the chambers, the BPM-MES achieved 238% improvement in cathodic acetate production rate, 45% increase in anodic substrate removal efficiency, and more than five times enhancement in current output, as compared to the PEM-MES. The biomass on the surface of anode and cathode, and the relative abundance of <I>Acetobacterium</I> in the cathode of BPM-MES was higher than that in PEM-MES. Bioanode MES with BPM should be a useful microbial electrosynthesis strategy for acetate production using bioenergy from wastewater treatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bioanode MES was constructed using BPM and PEM as separator, respectively. </LI> <LI> BPM-MES achieved 238% improvement in acetate production rate compared to PEM-MES. </LI> <LI> The biofilm biomass on the electrodes of BPM-MES were higher than the PEM-MES. </LI> <LI> Higher abundance of <I>Acetobacterium</I> was observed in the cathode of BPM-MES. </LI> </UL> </P>