The use of soil columns in the biological treatment of wastewater. Journal of the College of Basic Education, [S. l.], v. 21, n. 90, p. 13–28, 2022. DOI: 10.35950/cbej.v21i90.6850. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/6850.. Acesso em: 22 jul. 2024.