Potensiometric of Struvite (MgNH4PO4.6H2O) Formation System from Biogas Waste in Electrolysis CellsSintha Soraya Santi, Nina Eka Ayuanggraeni, Trusshero Kharisma Claudiana and SukamtoE3S Web Conf., 328 (2021) 09004DOI: https://doi.org/10.1051/e3sconf/202132809004