Reduction of methane and nitrous oxide emissions from stormwater bioretention cells through microbial electrolytic cells

This study investigated the reduction of methane (CH4) and nitrous oxide (N2O) emissions from stormwater bioretention cells through microbial electrolytic cell (MEC), showing the largest reduction of 32.21 % (CH4) at 9.2 mu A/m(2) of current density and 56.16 % (N2O) at 3.5 mu A/m(2) of current density, compared with the corresponding in the control (0 mu A/m(2) of current density). Kinetic of CH4 and N2O emissions could be well fitted by Logistic model with high correlation coefficient (R-2 > 0.9500) and model efficiency (ME > 0.95) but low relative root mean square error (RRMSE < 7.88). The increase of pmoA and polysaccharide (PS) were responsible for CH4 reduction, while N2O reduction was attributed to the decrease of nirS and the increase for nosZ and protein (PN), which could explain the lowest GWP(d) (10.67 mgCO(2)-eq/m(2)/h) at 3.5 mu A/m(2) of current density, suggesting that MEC could be promising for the reduction of CH4 and N2O emissions from bioretention cells.