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Characterization of Natural Organic matter by Rapid Mixing Condition  

Song, Yu-Kyung (부경대학교 토목공학과)
Jung, Chul-Woo (울산산업진흥 TP 전략산업기획단)
Son, Hee-Jong (부산광역시 상수도사업본부 수질연구소)
Sohn, In-Shik (부경대학교 토목공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.4, 2006 , pp. 559-571 More about this Journal
Abstract
The overall objective of this research was to find out the interrelation of coagulant and organic matter during rapid mixing process and to identify the change of organic matter by mixing condition and to evaluate the effect of coagulation pH. During the coagulation, substantial changes in dissolved organics must be occurred by coagulation due to the simultaneous formation of microflocs and NOM precipitates. Increase in the organic removal efficiency should be mainly caused by the removal of microflocs formed during coagulant injection. That is, during the mixing period, substantial amount of dissolved organics were transformed into microflocs due to the simultaneous formation of microflocs and NOM precipitates. The results also showed that 40 to 80% of dissolved organic matter was converted into particulate material after rapid mixing process of coagulation. During the rapid mixing period, for purewater, formation of dissolved Al(III) (monomer and polymer) constant by rapid mixing condition, but for raw water, the species of Al hydrolysis showed different result. During the rapid mixing period, for high coagulant dose, Al-ferron reaction increases rapidly. At A/D(Adsorption and Destabilization) and sweep condition, both $Al(OH)_3(s)$ and dissolved Al(III) (monomer and polymer) exist, concurrent reactions by both mechanism appear to cause simultaneous precipitation.
Keywords
coagulation; rapid mixing; microflocs; dissolved organic; hydrolyzed Al(III);
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