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In the present study, an experimental study was performed to investigate the influence on the coagulation process and purifying effect of FeCl3 coagulant in river water caused by electric treatment. The variation in water quality parameters under an electric field with different intensities and frequencies was examined in terms of the solution turbidity, particle size distribution, total organic carbon (TOC), chemical oxygen demand (COD) and zeta potential, and then the mechanism of these variations was discussed. The results showed that after the AEF coagulation treatment, the values of turbidity, COD, TOC and zeta potential decreased. The number of larger suspended particles increased. An electric field with a higher intensity or frequency could obtain a better effect on the removal of pollutants. In addition, the main mechanism of the improvement of removal efficiency was due to the electric field force caused by alternating electric fields, which could enhance the collision between charged particles.

Influence of an Alternating Electric Field on the Coagulation Process and Purifying Effect of FeCl3 Coagulant