Removal of turbidity from water by using modified starch of achira, Canna edulis Ker Gawl. (Cannaceae)

Abstract

Starch from achira Canna edulis Ker Gawl (Cannaceae) was used as coagulant to remove turbidity of water at different concentrations and modifications. Low percentages of moisture and high ash contents were detected for native and modified starch of achira. The starch was modified by alkaline treatment with sodium hydroxide and sodium hypochlorite. The removal of turbidity was found with a yield of 99.46% and 99.36%, for native and modified starch, respectively. Two factors were analyzed by ANOVA: type of coagulants (Native Starch (AN) and Modified Cationic Starch (ANC)) and coagulant concentration used (10, 15, 20, and 30 mg / L). The multifactorial statistical analysis showed that there was no significant difference in terms of removal of turbidity.