Waste Water Treatment-Bed of Coal Fly Ash for Dyes and Pigments Industry. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 16, n. 2, p. 48 – 56, 2015. DOI: 10.21743/. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/289. Acesso em: 5 nov. 2025.