Comparison of Inorganic and Organic Adsorbents Based on Biocompatible Polymer in Removal of Water Turbidity

Decreasing the concentration of colloidal suspended particles, the turbidity factor of water, has always been one of the main goals in the design of water treatment plants. The aim of this study was to compare two types of biocompatible polymeric and inorganic organic coagulants in removing turbidity in water.

The experimental samples of Karaj River after the garbage collection stage were carried out in the same amount of water and were in the same condition to identify the best percentage of colloidal particle removal and turbidity. Also for experimental design, data and variance analysis were used Minitab software. 

Karaj River water with 85.86 NTU turbidity in different concentration contact with inorganic coagulants (Aluminum sulfate and chloric ferric) and the organic polymeric coagulants (Starch and chitosan medium). The best concentrations of inorganic coagulants as chloric ferric is 6.5 mg/lit and aluminum sulfate is 10mg/lit and for organic polymeric coagulant as: chitosan is 5.2 mg/lit and starch- chitosan medium is 40% of chitosan and 60% starch.

The results of experimental data are shown that the combination of chitosan-starch has the best performance in removing turbidity from water. So that finally 60%-40% of chitosan and starch had the best percentage of turbidity removal and up to 99% were able to remove the remaining turbidity.