A. Hasan A. THE EFFECTIVENESS OF RETURN SLUDGE IN REMOVING UNDESIRABLE MATERIALS FROM CLARIFLOCCULATOR BASINS. J. eng. sustain. dev. [Internet]. 2021 Sep. 1 [cited 2025 Jul. 2];25(5):95-102. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/39