Improvement of biohydrogen production in microbial electrolysis cell (MEC) system by tackling methanogenesisMatthew Hardhi, Putty Ekadewi, Rita Arbianti, Tania Surya Utami and Heri HermansyahE3S Web Conf., 67 (2018) 02008DOI: https://doi.org/10.1051/e3sconf/20186702008