Comparing the Possibility of using Cationic Starch for Removal of Suspended Particles and Algae
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Abstract
Chemical substances are currently used as coagulants to improve water quality through a water treatment with coagulation and disinfection processes. However, it is concerned that the residue resulted from the reaction of chemicals can cause toxicity for human health when being exposed. Thus, it is important to study the possibility of using organic coagulants in the water supply treatment for removing suspended particles in the raw water. This research was to conduct the feasibility study of comparing organic coagulants such as cationic starch, alginate and bagasse ash to improve the raw water quality. The results showed that the cationic starch was more effective in comparison to other organic coagulants for the synthetic water. The cationic starch was introduced to study the removal of suspended particles and algae by comparing with the coagulation agent, PAC: Polymer. In this studies, 0.4 g : 0.02 g of PAC:Polymer ratio was used and was controlled at pH 10, whereas 0.85 g of cation starch was used and was controlled at pH 10. Higher removal efficiency of suspended particles in the raw water was observed for PAC: Polymer, but the cationic starch exhibited higher algae removal. The density of algae in the raw water may significantly affect the efficiency of turbidity and algae removal because algae can suspend in the water, implying both roles as suspended particles and turbidity.
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