Udianto, Fauzi, et al. “Effectiveness of Wastewater Treatment Plant in Reducing PO₄ and NH₃-N Pollutants at Tk. III Brawijaya Hospital Surabaya ”. Jurnal Hygiene Sanitasi, vol. 5, no. 1, Apr. 2025, pp. 23-28, doi:10.36568/hisan.v5i1.99.