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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.

suspended matter: Bacteria, algae, silt, sand and organic debris. Suspended matter - when it is larger than 5-10 µm can be removed quite easily by filtration or sedimentation and filtration. The removal of colloids is possible by slow filtration in cases the water is not strongly polluted. 1. Adsorption of potential determining ions.

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  Lecture, Filtration, Sand, Coagulation, Slow, Lecture 5, Flocculation, Coagulation and flocculation, Slow filtration

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