Evaluation of Alum and Poly Aluminium Chloride (PAC) Coagulant Effectiveness on CaCO₃ Reduction through Sedimentation Process
Keywords:
Sedimentation, Calcium Carbonat, PAC, AlumAbstract
Sedimentation is a solid–liquid separation process whose effectiveness can be improved through coagulation and flocculation. This study aimed to evaluate the effect of coagulant type and dosage on the reduction of calcium carbonate (CaCO₃) concentration in water. The coagulants used were alum and Poly Aluminium Chloride (PAC) with dosage variations of 40 g and 60 g. CaCO₃ concentration before and after treatment was analyzed using EDTA complexometric titration, while process performance was evaluated based on removal efficiency. The results showed that all treatments reduced CaCO₃ concentration. Alum at 40 g and 60 g achieved removal efficiencies of 25.00% and 33.33%, respectively, while PAC at 40 g and 60 g achieved 33.33% and 43.75%, respectively. PAC at 60 g showed the best performance due to its ability to form more stable and settleable flocs.
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