Remediation of Anthracene contaminated soil by microemulsion

• Main Authors: Guei-Chin Shiu, 許貴欽
• Other Authors: Fung-Hwa Chi
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/djay4v

碩士 === 崑山科技大學 === 環境工程研究所 === 97 === The micro-emulsified solvent(MES) prepared by adding soybean oil into anionic surfactant SDS (10 CMC) and the mixed surfactant were used to study the remediation of PAH contaminated soil. The stability of emulsified surfactant was investigated to avoid the stratification between water layer and emulsified droplets (micelles) by changing the ratio of oil to surfactant and the temperature. Mixture of two surfactants has been proved to be more efficiency than single surfactant for the desorption of hydrophobic contaminants from soil. Triton X-100 and SDS were mixed in different ratio to study the increase of the desorption efficiency (DE). The results show that increasing the time and temperature of sonification, the size of micelles decreased. The optimal condition of making micro-emulsified surfactant was at the ratio of oil to SDS (22.3 g/L) 1:9 (v/v) under 75℃, and the size of micelles formed was around 140 nm. Sonification time was also found to be a bottle-neck factor, and 40 min was decided. TheDE of MES was 3.5~4.5 folds of that only using SDS (10CMC) for anthracene contaminated soil at 500 ppm under the reaction time 48 h. The DE increases with the increasing of anthracene concentration sorbed in soil. If only Triton X-100 was used, the DE was 4.5% only. The age of MES resulted the decrease of the DE from 91% to 69% for 1day and 7 days, respectively. Regeneation of used MES reached 61% DE, the reason caused the decrease is due to the anthracene residual. In short, the EMS and mixed surfactant can greatly increase the DE of hydrophobic contaminant in soils.