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Characteristic of Al(III) Hydrolysis Specie Distribution on Coagulation Process  

Song, Yu-Kyung (Division of Construction Engineering, Pukyong National University)
Jung, Chul-Woo (Ulsan Regional Innovation Agency, Ulsan Industry Promotion Techno Park)
Hwangbo, Bong-Hyung (Waterworks Headquarter, Busan)
Sohn, In-Shik (Division of Construction Engineering, Pukyong National University)
Publication Information
Korean Chemical Engineering Research / v.44, no.5, 2006 , pp. 547-554 More about this Journal
Abstract
The overall objective of this research was to find out the role of rapid mixing conditions in the species of hydrolyzed Al(III) formed by Al(III) coagulants and to evaluate the distribution of hydrolyzed Al(III) species by coagulant dose and coagulation pH. When an Al(III) salt was added to water, monomeric Al(III), polymeric Al(III), precipitate Al(III) was formed by Al(III) hydrolysis. The method of hydrolyzed Al(III) species characterization analysis was based on timed spectrophotometer with ferron as a color developing reagent. The hydrolytic species were divided into monomer, polymer, precipitate from the reaction kinetics. And then, the color intensity for monomeric Al(III) was read 3 min after mixing. With standard Al solution containing monomeric Al(III) only, the Al-ferron color intensity slightly increased with until about 3 min. During the rapid mixing period, for purewater, formation of dissolved Al(III) (monomer and polymer) was similar to rapid mixing condition, but for raw water, the species of Al(III) hydrolysis showed different result. During the rapid mixing period, for high coagulant dose, Al-ferron reaction increases rapidly. The kinetic constants, Ka and Kb, derived from Al-ferron reaction. The kinetic constants followed very well the defined tendencies for coagulation condition. For pure water, when the rapid mixing time increased, the kinetic constants, Ka and Kb showed lower values. Also, for raw water, when the rapid mixing time increased, the kinetic constants, Ka and Kb showed lower values.
Keywords
Rapid Mixing; Hydrolyzed Al(III); Monomeric Al(III); Polymeric Al(III); Ferron;
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