Journal articles
Removal of NAPL from columns by oxidation, sparging, surfactant and thermal treatment
Abstract : In this paper, four treatment techniques commonly applied to Volatile Organic Compounds (VOC)
removal from soil are compared in column experiments with pure sand containing a residual Light Non-
Aqueous Phase Liquid (L-NAPL) contamination. Oxidation is tested through the injection of Fenton reagent,
with persulfate, and combined with sparging with the injection of ozone. Surfactant treatment
was conducted at low flow rates with Tween®80. Sparging was conducted by air injection but at a low
flow rate of 1 mL min1. Finally several columns were thermally treated at a temperature of 80 C. The
results showed high removal (>90%) for all techniques used, although only thermal treatment on BTEX
(Benzene, Toluene, Ethylbenzene and Xylenes) reached 100% efficiency. The main limiting factors of each
technique were: (i) for oxidation, the solubility of the substance limited the removal; (ii) for surfactant
both the solubility in the surfactant and the type of surfactant are important; (iii) for sparging, the main
factors are contaminant vapor pressure and porous media grain size; (iv) for thermal treatment, the
limitation arises from the contaminant vapor pressure and the medium hydraulic conductivity. A
comparison with literature data shows that the results are consistent with most of the studies conducted
on one technique.
Cited literature [41 references]
https://hal-amu.archives-ouvertes.fr/hal-01588249
Contributor : Patrick Höhener <>
Submitted on : Friday, May 4, 2018 - 10:02:38 AM
Last modification on : Tuesday, March 30, 2021 - 3:24:38 AM
Long-term archiving on: : Tuesday, September 25, 2018 - 7:58:19 PM
Contributor : Patrick Höhener <>
Submitted on : Friday, May 4, 2018 - 10:02:38 AM
Last modification on : Tuesday, March 30, 2021 - 3:24:38 AM
Long-term archiving on: : Tuesday, September 25, 2018 - 7:58:19 PM
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