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Determination of Set Point of Streaming Current for Optimum Coagulation  

Yu, Myong-Jin (Department of Environmental Engineering, University of Seoul)
Jang, Mi-Jeong (Department of Environmental Engineering, University of Seoul)
Park, Gui-Su (Department of Environmental Engineering, University of Seoul)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.1, 2006 , pp. 34-41 More about this Journal
Abstract
The objectives of this study were to investigate the affecting factors on streaming current(SC) and to evaluate set point(SP). For the study, a pilot scale apparatus with a capacity of 12 L/min was operated at Guui water intake of Seoul. SC was monitored with varying poly aluminium chlorides(PACs) dose and water quality parameters like conductivity, turbidity, temperature, and pH. The removal efficiencies were evaluated in terms of turbidity and dissolved organic carbon(DOC) with varying coagulation conditions. The effects of affecting factors on SC and SP were also estimated. According to the result observed from the variation of SC with water quality parameters during the experimental period, tendencies of SC and conductivity were very similar, and SC and conductivity had a strong linear relation. At the optimum condition of coagulation, SP decreased as the rainy season changed to the dry season, during the experimental period. Especially, in condition of low turbidity, conductivity had relatively more effect on SC than turbidity. As conductivity increased, SP decreased and coagulant dose per unit increase of SC gradually increased. In view of the results so far obtained, it may be possible to determine the SP range considering the real time variation of water quality, especially conductivity.
Keywords
Coagulation; SCD; SP; PACs; Conductivity;
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