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Increasing alkalinity to reduce turbidity
Increasing alkalinity can improve treatment at the best coagulant dosage.
Runoff can rapidly change coagulant demand and produce water that is difficult to treat by conventional coagulation processes. In cases in which alkalinity dropped below about 30 mg/L as CaCO3, adding supplemental OH– (using lime or sodium hydroxide)—and thereby markedly increasing alkalinity before adding coagulant—sharply reduced turbidity after sedimentation but increased coagulant demand. Coagulant demand was a linear function of increased alkalinity and raw water dissolved organic carbon, and it was not strongly influenced by turbidity or calcium concentration below about a pH of 7.8.
Increasing alkalinity to reduce turbidity
Increasing alkalinity can improve treatment at the best coagulant dosage.
Runoff can rapidly change coagulant demand and produce water that is difficult to treat by conventional coagulation processes. In cases in which alkalinity dropped below about 30 mg/L as CaCO3, adding supplemental OH– (using lime or sodium hydroxide)—and thereby markedly increasing alkalinity before adding coagulant—sharply reduced turbidity after sedimentation but increased coagulant demand. Coagulant demand was a linear function of increased alkalinity and raw water dissolved organic carbon, and it was not strongly influenced by turbidity or calcium concentration below about a pH of 7.8.
Increasing alkalinity to reduce turbidity
Tseng, Tai (Autor:in) / Segal, Brad D. (Autor:in) / Edwards, Marc (Autor:in)
Journal ‐ American Water Works Association ; 92 ; 44-54
01.06.2000
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Alkalinity , Calcium , Turbidity , Sodium Hydroxide , Coagulants , Sedimentation , pH , Organic Carbon , Lime
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