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PostSubject: Surface water treatment   Thu Feb 25, 2010 3:48 am

Surface water treatment

Due to the high cost of drinking water and the fact that water is not always available, more and more industries and municipalities use treated surface water. Normally the surface water needs to be treated before it has the required water quality. Surface water typically
contains a high suspended solids content, bacteria, algae, organic matter, creating bad taste and odour. In some areas, like river estuaries, surface water can be brackish, reaching up to 8000 mg/L of salts.

Two processes are commonly used to treat surface water: - Conventional treatment including clarification (coagulation / flocculation ,sedimentation or filtration), sand filtration, activated carbon adsorption and disinfection. - Advanced treatment based on ultrafiltartion technology.




Surface water treatment processes


Special attention is brought to disinfection since surface waters contain a wide range of coliforms (E.Coli), viruses and protozoa. The use of chlorine should be used with care since it reacts with natural organic matter to form disinfection by-products like trihalomethanes.
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