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정철우,손정기,손인식,강임석 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2
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 PACI) 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 PACI, 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 PACI, 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.