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Lecture 5. Coagulation and Flocculation

Lecture 5: Coagulation and FlocculationPrepared byHusam Al-NajarThe Islamic University of Gaza-Environmental Engineering DepartmentWater Treatment (EENV-4331)Colour in wateris a water treatment process that causes very small Coagulationsuspended particles to attract to one another and form larger particles. consist of adding a floc-forming chemical reagent to a water to enmesh (catch) or combine with non-settleablecolloidal solids and slow-settling suspended solids to produce a rapid-settling floc. is a water treatment process following Coagulation , Flocculationwhich uses gentle stirring to bring the suspended particles together so they will form larger more settleableclumps called floc. DefinitionsMany of the contaminants in water contain matter in the colloidal form. These colloids result in a stable suspension . In general the suspension is stable enough so that gravity forces will not cause precipitation of these colloidal particles. So they need special treatment to remove them from the aqueous phase.

repulsion/attraction developed between colloids. The net resultant force is a result of: 1. attractive potential energy (mostly van der Waals forces), V a. These forces are very strong at short separation distances 2. repulsion potential energy (electrostatic forces), V R. (by

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  Lecture, Coagulation, Attraction, Lecture 5, Repulsion, Flocculation, Coagulation and flocculation

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