effect of NaCl on coagulation with ferric chloride - Water and Wastewater.com Help Forum

Water and Wastewater.com Help Forum - Ferric chloride in water w/NaCl

besides there is no chemical interaction one has to consider the electrolyte effect on electrostatically stabilized colloids. Higher electrolyte concentrations cause the reduction of the electrostatic double layer thickness, i.e. reduce electrostatic repulsion. Therefore, the colloids can be more easily removed. On the other hand coagulation efficiency might be reduced due to a reduction of the effective surface of the coagulate.