Redox mediator-regulated microbial electrolysis cell to boost coulombic efficiency and degradation activity during gaseous chlorobenzene abatement

Structural Characteristics and Functional Genes of Biofilms in Microbial Electrolysis Cells for Chlorobenzene Abatement

“…The recorded cathode current as well as the Cl – concentration in the catholyte can be used to calculate the coulombic efficiency and energy input, which were parameters that quantified the percentage of electron conversion during Cl – generation, and thereby evaluate the energy utilization efficiency. The coulombic efficiency of MEC-RVC was as high as 84%, which was not only improved by over 1.7 and 1.9 times compared with MEC-CC and MEC-NF, respectively (Figure A) but was also at least 1.2 times superior to that of MECs with the addition of anthraquinone-2,6-disulfonate or flavin mononucleotide, as reported in the literature . The high coulombic efficiency of MEC-RVC was largely attributed to the outstanding dechlorination capacity of the system (Figure S7).…”

“…The calculation methods of removal efficiency, mineralization efficiency, elimination capacity, and coulombic efficiency have been described in previous work, which are shown in Text S5. The energy input (kW h mol –1 ) required for the generation of per unit mole of Cl – was calculated using the following formula e n e r g y i n p u t = U Q Δ false[ C l − false] V C a t where U ( V ) is the voltage applied in the system, Q ( C ) is the amount of charge calculated by integrating the current provided using a potentiostat over the operation time, Δ[Cl – ] ( M ) is the concentration variation of Cl – , and V cat (mL) is the working volume of the cathode chamber.…”

“…The coulombic efficiency of MEC-RVC was as high as 84%, which was not only improved by over 1.7 and 1.9 times compared with MEC-CC and MEC-NF, respectively (Figure 2A) but was also at least 1.2 times superior to that of MECs with the addition of anthraquinone-2,6-disulfonate or flavin mononucleotide, as reported in the literature. 20 The high coulombic efficiency of MEC-RVC was largely attributed to the outstanding dechlorination capacity of the system (Figure S7). As expected, the energy input for per mole Cl − generation was inversely related to the coulombic efficiency, and the energy input of MEC-RVC can be as low as 0.034 kW h mol −1 (Figure 2B).…”

“…The calculation methods of removal efficiency, mineralization efficiency, elimination capacity, and coulombic efficiency have been described in previous work, 20 which are shown in Text S5. The energy input (kW h mol −1 ) required for the generation of per unit mole of Cl − was calculated using the following formula…”