Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
권호 표지

Mixing effect of NaCl and surfactant on the remediation of TCB contaminated soil

Lee, Dal-Heui;Chang, Ho-Wan;Kim, Chul

  • Published : 2008.03.01
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Abstract

In order to evaluate the mixing effect of NaCl andsurfactant on the remediation of TCB contaminated soil, columnexperiments were performed. Selected soils for this study were twoIowa field soils (Fruitfield, and Webster) and one Korea field soil(Pyeongtaek). We used four nontoxic, water-soluble anionic (DOSL,robenzene (TCB) was chosen as the model contaminant. Selectedelectrolyte for this study was NaCl. The TCB contaminated soilswere leached with surfactant solution of 4% (v/v) or 4% (w/v)with or without 5% (w/v) and 10% (w/v) NaCl. As controls, TCBcontaminated soils were also leached with deionized water. For thenonionic surfactants (POE20, POE4), the mixing effect of NaCl onthe solubilization of contaminant was insignificant. However, muchgreater mixing effectiveness was observed using anionic surfactant(SLS, single head structure) solutions containing electrolyte (NaCl)from two Iowa soils and one Korea soil. In contrast, anothering effectiveness on the solubilization of TCB from thre soils.However, the NaCl mixing effect of DOSL anionic surfactant wasfound after leaching of 2500 ml solution with Pyeongtaek soil. Theeffect of NaCl in changing efectiveness was due to Na+ (counter-ion) effects. The maximum recovery of added TCB in column testswas 97% for 4% (w/v) aqueous SLS anionic surfactant + 10% (w/v)NaCl. A little effectiveness of 4% (v/v) DOSL (anionic surfactant)with electrolytes may be due to small adsorption of the double-headshowed that the key factor in the variation of TCB removal effectdue to surfactant + NaCl leaching was not surfactant types butsurfactant structure. Also, results of this study sugest that theanionic surfactant (SLS) solutions containing electrolyte (NaCl) isa good candidate for surfactant-asisted remediation of TCB con-taminated soil.

Keywords

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