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DOI : ,    Vol.3, No.2, 15 ~ 31, 1995
Title
Flocculation Kinetics Using Fe (3) Coagulant in Water Treatment The Effects of Water Temperature and Sulfate Ion
강임석Lim Seok Kang,John L . Cleasby
Abstract
The effects of low water temperature and sulfate ion on flocculation kinetics were examined using ferric nitrate as a coagulant to coagulate kaolin clay in water under tightly controlled treatment conditions. Both the particle size distribution data obtained from Automatic Image Analysis system and the on-line measurement of the degree of turbidity fluctuation in a flowing suspension by Photometric Dispersion Analyzer were used to measure flocculation kinetics. Results show that cold water temperature had a pronounced detrimental effect on flocculation kinetics. For improving flocculation kinetics at low temperature, maintaining constant pOH to adjust water chemistry for temperature changes was found to be partially effective, but only in the more acidic pH range studied (≤pH 6.8). However, the improved performance did not reach the performance at room temperature. In addition, sulfate ion added to kaolin suspension played an important role in the flocculation process, not only improving flocculation kinetics at more acidic pH levels but also changing surface charge of particles.
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