THE ROLE OF SODIUM ION IN PHOSPHORUS REMOVAL WHEN ALUM IS USED AS A COAGULANT. J. eng. sustain. dev. [Internet]. 2022 Sep. 1 [cited 2024 Apr. 29];26(5):127-3. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1886