Applied voltage optimization for denitrification process improvement by denitrifying species of Pseudomonas in microbial electrolysis cell (MEC)Putty Ekadewi, Matthew Hardhi, Putri Anggun Puspitarini, Hidayati Istiqomah, Cristina Gomez, Rita Arbianti, Tania Surya Utami and Heri HermansyahE3S Web Conf., 67 (2018) 02027DOI: https://doi.org/10.1051/e3sconf/20186702027