Improvement Coagulation Process in Removing Turbidity and Total Organic Carbon from Contaminated Water by Mixing Two Coagulants

Abstract

Turbidity previously linked with the presence of pathogens  has been eradicated by the coagulation process. Coagulation is a chemical treatment procedure that removes solids from water by changing the electrostatic charges of particles suspended in water. The eradication of turbidity and total organic carbon (TOC) has been investigated in this research by adding coagulants such as alum and FeCl₃ respectively in concentrations (0, 5, 15, 25, 35, 45mg/L)to water in  each jar  on a jar measure. And studying the effect of the coagulant concentration on the removal of turbidity and total organic carbon(TOC) .The concentration used (0,5,15,25,35 mg/L)in each jars in the jartest   .The speed  of  flash and slow mixing got initially  by testing with three different speeds (flash mixing 400,300,220rpm )and(slow mixing 50,60,70rpm) and then selecting the one that provided the least turbidity and total organic carbon. The same procedure done with three different pH of water (6,7.25,8 )to study the effect of pH on coagulation . The findings show that FeCl₃ is more successful at removing turbidity and total organic carbon. It has been observed that 220 rpm,50 rpm,6 pH yields the best outcomes. Mixing of two Coagulant alum and FeCl₃ was studied to improve coagulation process and reduce the cost of coagulant  .Mixing of two coagulants was made with proportions   (Alum100%+Fecl₃0%, Alum75%+Fecl₃25%, Alum50%+Fecl₃  50%, Alum25%+Fecl₃75%, Alum0%+Fecl₃100%). Best removal of turbidity and TOC at 25 mg/L (75 percent Alum25%+Fecl₃75%,).This study proved that Mixing coagulation improves the coagulation process in removing turbidity and total organic carbon .