Firstly, water is allowed to undergo coagulation process. The principle of coagulation process is to remove turbidity from the water, microorganisms, chemical in solution, colloidal and suspended solids (Binnie & Kimber, 2002). Turbidity refers to a cloudy appearance of water due to existence of small particles suspended. Hence, no turbidity results in clearer water. The most frequently used coagulants are aluminium sulphate (alum) and iron salts. Basically, most of the dissolved particles in water bear negative charges that have a tendency to repel each other. In order to clump the particles together, alum which consists of positive charges is added. Therefore, negative charges particles magnetize towards the positive charges that resulted in a neutral or lack of charge. When there is no repelling amongst the particles, Van der Waal’s forces assembles the particles. Finally, the particles settled out from the water. However, Pizzi’s (2010) study suggests that the amount of alum added to the water must be in ...
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