Adsorption Effectiveness of Coffee Grounds Activated Carbon in Reducing Iron (Fe) Control in Water. Gema Lingkungan Kesehatan, [S. l.], v. 24, n. 4, p. 599–606, 2026. DOI: 10.36568/gelinkes.v24i4.390. Disponível em: https://gelinkes.poltekkesdepkes-sby.ac.id/index.php/gelinkes/article/view/390. Acesso em: 25 sep. 2026.