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Nonhalogenated
SVOC's:
PAH's etc.
Nonhalogenated
SVOC's
in Soil
Common treatment technologies include: |
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Biodegradation
MEL-Bio®
All types of biodegradation, both
in situ or ex situ, can be considered to remediate soils:
in situ bioremediation, bioventing, composting, controlled
solid phase, or landfarming. Treatability studies should
be conducted to evaluate design parameters, such as degradation
rates, supplemental organism addition, cleanup levels
achievable, degradation intermediates, and nutrient/oxygen
addition.
Biodegradation uses a process in which
indigenous or inoculated micro-organisms (e.g., fungi,
bacteria, and other microbes) degrade (i.e., metabolise)
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, water, and microbial cell mass. 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 (liners and aeration) or reactor. Bioventing is also
potentially applicable to some nonhalogenated SVOC's.
Thermal Treatment
MEL-Therm®
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.
Excavation with
Off-Site Disposal
Excavation, retrieval, and off-site
disposal of contaminated soil (with or without stabilisation)
to a landfill have been performed extensively at many
sites.
Landfilling of hazardous materials,
especially hazardous wastes, is becoming increasingly
difficult and expensive as a result of growing regulatory
control, and may be cost-prohibitive for sites with large
volumes, greater depths, or complex hydrogeologic environments.
Determining the feasibility of off-site disposal requires
knowledge of land disposal restrictions and other regulations,
which MEL can provide.
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