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Putty Ekadewi, M. Hardhi, Putri Anggun Puspitarini, H. Istiqomah +4
This study investigates applied voltage optimization for denitrification in single-chambered microbial electrolysis cells (MECs) using two Pseudomonas species. Pseudomonas aeruginosa and P. nitroreducens were tested across 0.35–1.20 V applied voltages in heterotrophic medium with acetate as carbon source. Native nitrate removal efficiencies of ~70% improved to ~89–90% at 1.20 V. P. aeruginosa demonstrated superior current stability and voltage sensitivity, making it more promising for wastewater treatment. Operating voltages of 0.35–0.70 V were recommended based on technical and economic considerations despite lower removal efficiency than 1.20 V.
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Denitrification is the conversion process of nitrate to gaseous nitrogen forms carried out by bacteria commonly referred to as denitrifiers. Microbial Electrolysis Cell (MEC) is a type of bioelectrochemical system (BES) that is connected to external power source to aid the reactions. This research investigates the effect of applied voltage value on denitrification by nitrate removal efficiency of two model denitrifying species from the genus Pseudomonas in single-chambered MEC. Pseudomonas aeruginosa and Pseudomonas nitroreducens exhibited native removal efficiency at 70.62% and 68.20%, respectively. These values respectively reached up to 89.67% and 88.58% at 1.20 V, the upper limit of this study. Pseudomonas aeruginosa displayed better performance in MEC based off its produced current stability (mA) across the 0.35-1.20 V range. The effect of applied voltage on nitrate removal efficiency and setup performance was more prominent on known exoelectrogenic species of Pseudomonas such as Pseudomonas aeruginosa compared to Pseudomonas nitroreducens. Operating applied voltages of 0.35 V and 0.70 V was recommended for the application of the system based on technical and economical considerations. Further studies are needed to determine the response of the bacteria on wider range of applied voltages in MEC as well as elucidating these effects on autotrophic systems.