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Improvement of Water Treatment Efficiency by Poly Aluminum Chloride Overdosing in High pH Raw Water  

Lim, Jaecheol (한국수자원공사 동두천수도서비스센터)
Kim, Jinkeun (한국수자원공사 수도관리처)
Publication Information
Journal of Korean Society of Water and Wastewater / v.23, no.1, 2009 , pp. 39-46 More about this Journal
Abstract
A method to improve water treatment efficiency by coagulant overdosing for high pH raw water at a drinking water treatment plant (WTP) which had no pH adjusting facilities was investigated. Poly aluminum chloride (PACl) was used for coagulant, and turbidity removal efficiency was evaluated as a function of PACl dosage increases. pH and turbidity of supernatant of jar-tester were 7.10 and 0.50 NTU respectively, when the turbidity, pH, alkalinity, water temperature, conductivity of raw water were 1.75 NTU, 9.38, 46.5 mg/L, $6.4^{\circ}C$, $400{\mu}s/cm$, respectively. Turbidity of settled water was reduced from 2.18 NTU to 0.28 NTU (87% reduction) when PACl dosage was increased from 16 mg/L to 45 mg/L at a full scale WTP. This can be attributed to the recovery of coagulant efficiency by pH reduction with the increase of coagulant dose, however coagulation efficiency was reduced with the formation of Al(OH)4- by PACl addition at higher pH. Coagulant overdosing was proven to be a rapid and effective method for high pH raw water, which can be applied at drinking WTP.
Keywords
high pH; coagulant overdosing; PACl; water treatment; coagulation; algae;
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Times Cited By KSCI : 1  (Citation Analysis)
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