Enhanced nutrient removal from mixed black water by a microbial ultra-low weak electrical stimulated anaerobic-two stage anoxic/aerobic process

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

“…Results showed an increase in aromatic amino acids and enhanced electron transfer under 0.2 V microbial weak electricity stimulation, which increased the denitrification rate to 98.1 %. In another study, a MFC was coupled with a MEC, and the MEC was stimulated in situ using ultra-low microbial weak electricity of 0.1 V generated by MFC (Qin et al 2022). Findings show the formation of aromatic proteins and the increase of tightly bound extracellular polymers involved in electron transfer, and the TN removal efficiency increased from 88.7 % to 91.3 %, thus revealing the activation of autotrophic microorganisms and the inhibition of some heterotrophic microorganisms.…”

“…Therefore, sustainable technologies are needed to recover resources such as electricity and remove nitrogen from carbon-deficient wastewater to reduce greenhouse gases emissions. For ameliorating nitrogen removal in carbon-deficient wastewater, bioelectrochemical systems (BES) such as microbial fuel cells (MFC) and microbial electrolytic cells (MEC) are currently under intense research (Mier et al, 2021;Qin et al, 2022;Zhang et al, 2022).…”