| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 97 === Hydrophobic chlorinated organic pollutants are in general characterized by high toxicity and have long half-time like Pentachlorophenol and 2,4-Dichlorophenol. When these chlorophenols into the soil can be easily adsorbted by Soil Organic Matter(SOM) and slowly releaseed into groundwater.
In this study, Sodium Hydroxide(NaOH) and Acetic Acid(HAc) were used for removal two chlorophenols from contaminated soil by Electrokinetic treatment.Test were conducted on a kaolin and two mixtures with quartz sand which spiked with PCP or 2,4-DCP in concentration of 20 mg/kg, under the application of a voltage gradient of 3.33 V/cm.
The electrolyte solution applied were 0.05N NaOH and 0.1N HAc.The result showed that 100% of the PCP or 2,4-DCP were from the soils, when 0.05N NaOH was used. However when using 0.1N HAc, the removal was 37%、39% and 23% for PCP, the removal was 56%、46% and 25% for 2,4-DCP. Using exchange system can effectively control the pH gradient during electrokinetic process. Accroding experiment result, voltage gradient of 3.33 V/cm and 0.05N NaOH as electrolyte solution can effectively removal two chlorophnols from soils.
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