| Summary: | 碩士 === 國立中山大學 === 海洋環境工程研究所 === 85 === Marine discharge is being increasingly used in treatment of wastewater in recent years. However, it should be extremely careful dealing with toxic substances, such as DDT and PCBs, because these substances are harmful to marine ecosystem and should be removed before discharge. This aspect becomes more important as higher effluent standard is required today.
The concept of utilizing solubilization as a separation process was addressed by Nagarajan in 1981, and has been studied since then. A surfactant aggregate called admicelle was formed on the surface of metal oxide under certain conditions, and should be able to solubilize organics as micelle. As such, hydrophobic pollutants can be driven from the aqueous phase into admicellar hydrocarbon core coated on the solid phase. The aqueous phase can then be easily separated from the solid phase by solid/liquid separation.
Batch mode adsolubilization experiments were initially carried out to estimate K. p for alcohols in SDS/alumina admicelles. Multi-solutes experiments were executed to investigate background solutes effect, caused by solutes with different Kow and in different extent of adsorption on aluminum oxide, on the Kp of the target solute. The larger of the background solution''s Kow or the more extent of background solutes adsorption on aluminum oxide, the more of the target solute''s Kp decreased.
An admicellar enhanced CSTFR (continuously stirred tank flow reactor) has been set up. Solutions containing alcohols were introduced into this reactor for breakthrough experiments. Two phenomena observed during experiments with background solute. One is competition effect caused by background solutes with higher hydrophobicity, the other is co-solvent effect caused by background solutes with less hydrophobicity.
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