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|標題:||In situ iron activated persulfate oxidative fluid sparging treatment of TCE contamination - A proof of concept study|
|期刊/報告no：:||Journal of Contaminant Hydrology, Volume 100, Issue 3-4, Page(s) 91-100.|
|摘要:||In situ chemical oxidation (ISCO) is considered a reliable technology to treat groundwater contaminated with high concentrations of organic contaminants. An ISCO oxidant, persulfate anion (S2O82-) can be activated by ferrous ion (Fe2+) to generate sulfate radicals (E degrees = 2.6 V), which are capable of destroying trichloroethylene (TCE). The property of polarity inhibits S2O82- or sulfate radical (SO4-) from effectively oxidizing separate phase TCE, a dense non-aqueous phase liquid (DNAPL). Thus the oxidation primarily takes place in the aqueous phase where TCE is dissolved. A bench column study was conducted to demonstrate a conceptual remediation method by flushing either (SO82-)-O-2 or Fe2+ through a soil column, where the TCE DNAPL was present, and passing the dissolved mixture through either a Fe2+ or S2O82- fluid sparging curtain. Also, the effect of a solubility enhancing chemical, hydroxypropy-beta-cyclodextrin (HPCD), was tested to evaluate its ability to increase the aqueous TCE concentration. Both flushing arrangements may result in similar TCE degradation efficiencies of 35% to 42% estimated by the ratio of TCE degraded/(TCE degraded +TCE remained in effluent) and degradation byproduct chloride generation rates of 4.9 to 7.6 mg Cl- per soil column pore volume. The addition of HPCD did greatly increase the aqueous TCE concentration. However, the TCE degradation efficiency decreased because the TCE degradation was a lower percentage of the relatively greater amount of dissolved TCE by HPCD. This conceptual treatment may serve as a reference for potential on-site application. (C) 2008 Elsevier B.V. All rights reserved.|
|Appears in Collections:||環境工程學系所|
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