NC Water Operator Guías de estudio, Notas de estudios & Resúmenes

Presedimentation Reduce silt in water Settling zone Calm area in settling basin where suspended materials settle Coagulation Occurs in Seconds Flocculation Occurs in Minutes (optimum velocity 0.5 fps) Floc should be popcorn sized Sedimentation Occurs in Hours (4 hour detention time) Typical Coagulants Aluminum Sulfate Al2(SO4)3 Ferrix Fe2(SO4)3 pH Increasing Chemicals Lime (Ca(OH)2), Caustic soda, Soda ash, Bicarbonate pH Lowering Carbon...