Removal of nonvolatile hydrophobie compounds from artificially and naturally contaminated soils by column flotation

Document Type

Article

Publication Date

1-1-1998

Abstract

Removal of a nonvolatile paraffin oil from spiked soils using column flotation with countercurrent bubbles was explored at both ambient and elevated temperatures. Up to 80% of the contaminant was separated from the coarse fraction (250 to 800 urn) by flotation at 45°C using aqueous solutions of anionic and nonionic surfactants or alkali salt as collectors. With the 75 to 800m fraction, removal efficiencies of up to 65% was achieved. Sodium dodecyl-sulfate and Triton WOXatSOppm concentrations as well as sodium carbonate at pH 10 were found to yield similar removal efficiencies. Same surfactants were tested in soil washing experiments at similar and higher dosages. Removal efficiency by flotation washigherthan those obtained by soil washing in all cases. In addition, as high surfactant dosage are not used in flotation, unlike in the case of soil washing, the problem of formation of stable emulsions was absent. Experiments with soil polluted by hydrocarbons from a contaminated site demonstrated the feasibility of the flotation process for decontamination of coarse (250 to 830 urn) fractions. A 70% reduction of petroleum hydrocarbon in soil was achieved as a result of flotation at 45°C using the above surfactants. © 1998 by AEHS.

Identifier

19544375093 (Scopus)

Publication Title

Soil and Sediment Contamination

External Full Text Location

https://doi.org/10.1080/10588339891334456

ISSN

10588337

First Page

559

Last Page

571

Issue

5

Volume

7

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