Evaluating the Performance of Inorganic Coagulants (Poly Aluminum Chloride, Ferrous Sulfate, Ferric Chloride and Al Minum Sulfate) in Removing the Turbidity From Aqueous Solutions



Pirsaheb M¹ ; Sharafi K^{1, 2} ; Karami A^{1, 3} ; Dargahi A^{1, 3} ; Ejraei A¹ Show Affiliations
Source: International Journal of Pharmacy and Technology Published:2016

Abstract

One of the natural pollutant in surface water particularly rivers and lakes are colloidal impurities. Turbidity in addition to having a not desirable appearance, could be a haven for microorganism against differences. For this reason the aim of this study is evaluating and assessing the coagulants (poly aluminum chloride, ferrous sulfate, ferric chloride and aluminum sulfate) efficiency in removing the turbidity from aqueous solutions and also their effect on electrical conductivity and alkalinity. The present research is a research-intervention and have done by a jar test device in a laboratory scale. For comparing the efficiency of coagulants in removing turbidity, various test have been done based on the variables such as various turbidity (50, 100, 200, 20, 10 NTU) and different concentration of coagulants (30, 25, 20, 15, 10, 5 mg/l). The upper water of sample was taken after the jar test operation for turbidity, EC and alkalinity evaluation. Settling characteristic of clots recorded after observing in the descriptive form by words such as poor, fair, good and excellent. The results showed that, poly aluminum chloride with 5mg/l concentration is the best coagulant for removing turbidity (99-99.8%). With this description by increasing the amount of this coagulant, the clot size in turbidity of 200, 100, 50, 20, 10 NTU were still fine but the settling speed of them is very good. By increasing the coagulant concentration the EC level was increased and alkalinity was reduced. Also the most and the least increase of EC and TDS was in ferric chloride and poly aluminumcoagulant respectively. The results of this evaluation showed that poly aluminum chloride is the best coagulant for removing the turbidity. With this description the clots size was fine but the settling speed of it was good. © 2016, International Journal of Pharmacy and Technology. All rights reserved.