Bioelectricity production from tofu wastewater using microbial fuel cells with microalgae Spirulina sp as catholyteWahyu Zuli Pratiwi, Hadiyanto Hadiyanto, Purwanto Purwanto and Muthi’ah Nur FadlilahE3S Web Conf., 202 (2020) 08007DOI: https://doi.org/10.1051/e3sconf/202020208007