Removal Of Volatile Organic Compounds
From Soil
Author(s)
R. S. Amano
Abstract
Pollution by petroleum products is a source of volatile organic compounds in
soil. Therefore, laboratory column venting experiments were completed in order
to investigate the removal of a pure compound (toluene) and a mixture of two
(toluene and n-heptane) and five (toluene, n-heptane, ethylbenzene, m-xylene
and p-xylene) compounds. The choice of the compounds, as well as their
proportion in the mixture, was made on the basis of the real fuel composition.
The objective of this study is a comparison between the experimental volatile
organic compounds removal results and the computational fluid dynamics
(CFDs) analysis. The proposed model for the contaminants transport describes
the removal of organic compounds from soil, the contaminants being distributed
among four phases: vapor, nonaqueous liquid phase, aqueous and \“solid”; the
local phase’s equilibrium and the ideal behavior of all four phases was found to
be accurate enough to describe the interphase mass transfer. The process
developed in the lab consists of a heater/boiler that pumps and circulates hot oil
through a pipeline that is enclosed in a larger-diameter pipe. This extraction pipe
is vertically installed within the contaminated soil up to a certain depth and is
welded at the bottom and capped at the top. The number of heat source pipes and
extraction wells depends on the type of soil, the type of pollutants, and the
moisture content of the soil and the size of the area to be cleaned. The heat
source heats the soil, which is transported in the interior part of the soil by means
of conduction and convection. This heating of the soil results in vaporization of
the gases, which are then driven out of the soil by the extraction well. The
extraction well consists of the blower, which sucks the vaporized gases out of the
system. Our previous studies have removed higher boiling compounds, such as
naphthalene, etc., to a non-detectable level. Thus, the current technology is very
promising for removing most of the chemical compounds; and can also remove
these high boiling compounds from the saturated zone. The reasonable
Keywords
soil remediation, vapor extraction, volatile organic compound removal
Related Book
Other papers in this volume
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