EFFECT OF ADSORPTION CONDITIONS ON THE REMOVAL OF LEAD (II) USING SEWAGE SLUDGE AS ADSORBENT MATERIAL. J. eng. sustain. dev. [Internet]. 2022 May 1 [cited 2024 Apr. 28];26(3):1-9. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/923