b-시클로덱스트린(b-Cyclodextrin)의 결합 특성과 벤젠의 생물학적 분해에의 적용에 관한 연구

Abstract

Recently, surfactants were frequently used in order to desorb the hydrophobic organic compounds (HOCs) from soil and to enhance the bioavailability. Among them, -cyclodextrin (-CD) is one of those. This study was performed to investigate the binding characteristics between benzene and -CD and to examine the bioavailability of benzene. First, we investigated binding charasteristics between benzene and -CD in water and water/soil system. Then, we examined the effect of -CD on the biodegradation of benzene in water and water/soil system. Experimental results on the binding characteristics showed that -CD resulted in an efficient complex formation with benzene. As -CD concentration increased, the benzene concentration complexed with -CD rapidly increased to 30~40% initial benzene added, and reached the equilibrium. We also investigated the effect of -CD on the desorption of benzene from soil in the water/soil system. As -CD concentration increased, benzene concentration desorbed into water increased up to 90%. However, in its application to biodegradation of benzene in water and water/soil system, the biodegradation rate of benzene did not improved in the presence of -CD compared with in the absense of -CD. This result indicated that -CD was more preferentially used as a carbon source than benzene. Therefore, for remediation of benzene contaminated soils, -CD can be used as a surfactant to desorb benzene from soil, and then ex-situ chemical treatment can be applied for the remediation.