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Fuels:
Petrol, Diesel etc
Fuels in Soil
Common treatment technologies include: |
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SVE
(Soil Vapour Extraction) MEL-VacEx®
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SVE
(Soil Vapour Extraction) MEL-VacEx®
is an in-situ soil remediation technology in which a vacuum
is applied to the soil to induce the controlled flow of
air and remove volatile and some semi-volatile contaminants
from the soil. The gas leaving the soil may be treated
to recover or destroy the contaminants, depending on local
discharge regulations.
Vertical extraction vents are typically used at depths
of 1.5 meters or greater and have been
successfully applied as deep as 91 meters. Horizontal
extraction vents (installed in trenches or horizontal
borings) can be used as warranted by contaminant zone
geometry, drill rig access, or other site-specific factors.
Ground water extraction pumps may be used to reduce ground
water upwelling induced by the vacuum or to increase the
depth of the vadose zone. Air injection may be effective
for facilitating extraction of deep contamination, contamination
in low permeability soils, and contamination in the saturated
zone.
Thermal Treatment
MEL-Therm®
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Thermal Treatment MEL-Therm®
system is a physical separation process and is not designed
to destroy organics. Wastes are heated to between 200-500¡C
to volatilise water and organic contaminants. A carrier
gas or vacuum system transports volatilised water and
organics to the gas treatment system.
Thermal Treatment is a technology that has been proven
successful for remediating hydrocarbon and other contamination
in all types of soil. Decontaminated soil retains its
physical properties and ability to support biological
activity enabling re-use on site.
Biodegradation
MEL-Bio®
Biodegradation MEL-Bio®
uses indigenous or inoculated micro-organisms (e.g., fungi,
bacteria, and other microbes) to degrade organic contaminants
found in soil and/or
ground water. In the presence of sufficient oxygen (aerobic
conditions), micro-organisms will ultimately convert many
organic contaminants to carbon dioxide.
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All types of biodegradation, both in situ or ex situ,
can be used to remediate soils: in situ biodegradation,
bioventing, composting, bioslurping, biopiles or land-farming.
In the absence of oxygen (anaerobic conditions), the contaminants
will be ultimately changed to methane. In-situ bioremediation
of soil typically involves the percolation or injection
of ground water or uncontaminated water containing dissolved
oxygen and nutrients. Ex situ bioremediation typically
uses tilling or continuously mixed slurries to apply oxygen
and nutrients, and is performed in a prepared bed or reactor.
Bioventing is an in situ technique that uses air injection
to aerate the soil and enhance biodegradation.
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