Study on Remediation Technologies for Pentachlorophenol Pollutant in Soil
| Autor: | I-Min Su, 蘇益民 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Chlorophenol compounds are difficult to break down naturally in the environment. This study was to use Fenton oxidation, TiO2 photocatalytic degradation, biological surfactants cyclodextrins washing, supercritical carbon dioxide extraction to remove or destroy pentachlorophenol in soils, it has reached in the environment PCP reduction purposes. Soil samples used in this study were obtained from the central region of Taiwan, and were the common red and alluvial soils. The characteristics of soils was analyzed and discussed, herein the contaminated soil was prepared by spiking PCP in soil. The result of Fenton oxidation indicated that H2O2 concentration 206 mM and Fe2+ concentration 57.6 mM were the optimal concentrations for the red soil experiment, the removal efficiency of PCP reached to 75%, however the concentration of H2O2 required to upgrade to 825 mM for alluvial soil in order to obtain 70% removal efficiency. Using 1 mM Cyclodextrin solution to wash PCP from soil, the removal efficiency was 60% for red soil while reach to 80% for alluvial soil. Various temperature, pressure and modifier ratio were conducted in supercritical carbon dioxide extraction experiments. The extraction efficiency reached to 60% in the condition of 100 bar and 70˚C for both soils, moreover the extraction efficiency increased about 10% while 5% (v/v) methanol modifier was introduced, however the extraction efficiency decreased when 10% modifier was overdosed. The extracted PCP was concentrated in the methanol with 2 mL volume, was then examined with Fenton reaction. The data showed the PCP was completely destructed by using significantly lower amount of Fenton’s reagent compared to directly addition of Fenton’s reagent to soil. Keywords: Supercritical fluid extraction, Soil, Pentachlorophenol, Fenton oxidation, Cyclodextrin. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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