Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/45241
標題: In situ iron activated persulfate oxidative fluid sparging treatment of TCE contamination - A proof of concept study
作者: Liang, C.J.
梁振儒
Lee, I.L.
關鍵字: ISCO
Persulfate
Sulfate radical
DNAPL
Cyclodextrin
Groundwater
remediation
hydroxypropyl-beta-cyclodextrin
polarity organic-compounds
soil
trichloroethylene
tetrachloroethylene
solubilization
degradation
ion
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.
URI: http://hdl.handle.net/11455/45241
ISSN: 0169-7722
文章連結: http://dx.doi.org/10.1016/j.jconhyd.2008.05.012
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