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Characteristic of Al(III) Hydrosis Species at Rapid Mixing Condition  

Jung, Chul-Woo (대구경북개발연구원)
Son, Jung-Gi (부경대학교 건설공학부)
Shon, In-Shik (부경대학교 건설공학부)
Kang, Lim-Seok (부경대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.18, no.2, 2004 , pp. 128-136 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 different Al(III) coagulants. When an Al(III) salt is added to water, monomers, polymers, or solid precipitates may form. Different Al(III) coagulants (alum and PACl) show to have different Al species distribution over a rapid mixing condition. During the rapid mixing period, for alum, formation of dissolved Al(III) (monomer and polymer) increases, but for PACl, precipitates of $Al(OH)_{3(s)}$. increases rapidly. Also, for alum, higher mixing speed favoured Al(III) polymers formation over precipitates of $Al(OH)_{3(s)}$ but for PACl, higher mixing speed formed more precipitates of $Al(OH)_{3(s)}$. At A/D 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
Rapid Mixing; Coagulation Mechanism; Al(III) Hydrolysis; Basicity;
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