Power The presence of suspended and colloidal impurities in water which lead to color, and unpleasant smell and taste of water necessitates water and wastewater treatment. These impurities can be removed only by the process of coagulation and flocculation. However, the coarse particles are easily separated in sedimentation ponds by the network, mesh or water stilling process. Clarification includes the processes of coagulation, flocculation and sedimentation. In practice, conclusion, or addition of chemicals to water makes the particles ready to stick together and form larger particles due to the neutralization of electric charges. This neutralization of the particles also results in removal of the repulsive force between the particles. It is noteworthy that the coagulation process can reduce or remove the turbidity arising from organic and inorganic substances, different types of microorganisms, colors and phosphate.

In the next step and in the flocculation stage, the coagulants are made close together through laminar mixing and create larger particles which are readily deposited. The flocculation process is a very critical operation which should be done with much care, so that the created clots are not separated. During the sedimentation operation, the coagulated and clotted particles are put in appropriate conditions for sedimentation and clear water is obtained.  The materials and equipment used in the process of clarification should be used in the right way so that this action can have a good efficiency .

We used a natural mineral called zeolite as the coagulant aid and adsorbent for the wastewater treatment. Zeolite contains about 80% SiO2 and a relatively small percentage of other oxides such as Al2O3, Fe2O3, and MgO.