Destabilization of Colloidal Suspensions 3.1 COLLOIDAL SUSPENSIONS
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چکیده
Many impurities in waters and wastewaters are present as colloidal dispersions, i.e. they occur in particulate form within the approximate size range 1 to 10 -3 μm (refer Fig 1.3). Examples of this type of suspension include clays, substances of biological origin such as natural colour, proteins, carbohydrates and their natural or industrial derivatives. Invariably suspensions of this type possess an inherent stability or resistance to particle aggregation. They are not amenable to clarification by sedimentation due to their negligible settling velocity (refer Fig 2.2) nor can they be clarified by sand filtration processes. Their transformation to a flocculent condition is effected by the process of coagulation.
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