COLOR AND TURBIDITY REMOVAL WITH REUSABLE MAGNETITE PARTICLES .7. A COLLOID CHEMISTRY STUDY OF THE EFFECT OF INORGANIC-IONS ON THE EFFICIENCY OF CLARIFICATION

The removal of color and turbidity from natural waters by the addition of magnetite is an interfacial process. The components of this system are of colloidal dimensions or of a surface active nature; thus, this method of water clarification is very much in the realm of surface and colloid chemistry. Electrokinetic techniques were used to examine the influence of a number of inorganic species, commonly encountered in the practical situation, on the surface properties of magnetite and consequently on the efficiency of the process.