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Abstract
In the present thesis, sodium bentonite clay and combination of bentonite-cationic polymer were investigated to enhance settling of aluminum from lean sludge of drinking water treatment plants and to dewater the sludge, increasing its solid content for better handling and reuse. Sodium bentonite as a natural material is usually a cheaper coagulant with high swelling mechanism, has high specific surface area with net negative charge, and can enhance its sorption capability. Lean sludge was characterized using Inductively coupled plasma-optical emission spectrum (ICP-OES), while, bentonite was characterized by using X-ray diffraction (XRD). Jar test experiments were performed at different pH, different volume dosages and concentration of bentonite and combination of bentonite-cationic polymer. A treatment compact unit was proposed and studied economically