S. Shihab, M., I. Al-Hyaly, A. and M. Alobaidi, R. (2009) “ and Metal/MLSS Ratio on the Removal of Cd and Pb in the Activated Sludge Units”, Al-Rafidain Engineering Journal (AREJ), 17(6), pp. 54–64. doi: 10.33899/rengj.2009.43635.