New approach to investigate and to monitor the coagulation process during wastewater treatment

Abstract

In this work, the main objective is to show the performance of impedance spectroscopy in the optimization of the coagulation process and to highlight the effect of aluminum sulfate in this process. All parameters deduced from the impedance spectrum from the appropriate equivalent circuit such as the hopping conductivity (σho), relaxation time (τ), and dielectric strength (Δε) showed a net transition at 15 mg/l. This transition indicates two regions and leads to estimating the optimal concentration to achieve the coagulation process. We have concluded that 15 mg/l, is an optimal concentration to ensure a good coagulant of the suspended particles. Thus the addition of aluminum sulfate shows a reduction in the raw sample conductivity at this optimal concentration.