Abstract
Relative change in the electrogenic activity and potential losses during electron transfer in microbial fuel cell (MFC) was elucidated using real-field recalcitrant pharmaceutical wastewater as anolyte by varying substrate/organic load (OL1, 1.98; OL2, 3.96; OL3, 5.93, OL4, 7.98kgCOD/m3). Increase in organic load showed improvement in electrogenic activity (OL4: 346mV, 205.61mW/m2; OL3: 320mV, 158.58mW/m2; OL2: 290mV, 112.87mW/m2; OL1: 256mV, 72.60mW/m2). Both activation and ohmic losses showed decrement with increase in organic load while concentration losses depicted increment. Improvement in power output was non-linear with increase in organic load due to the anodic over potentials, described as electron transfer resistances and potential losses. Bio-electrochemical analysis also depicted the electron losses in terms of electron discharge and energy generation with the function of varying organic load.
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