Effect of River Sand and Rice Husk Charcoal Filter Media Thickness on the Purification of River Water. International Journal of Energy & Environment, [S. l.], v. 1, n. 1, p. 268–274, 2026. Disponível em: https://e-journal.scholar-publishing.org/index.php/ijee/article/view/270. Acesso em: 26 jul. 2026.