This
former coating factory site was contaminated with carbon tetrachloride.
An ex-situ remediation scheme was designed and executed by RemedX.
Soils suitable for soil vapour
extraction (SVE) were segregated and treated in a purpose built lined
treatment bed.
Over one
tonne of carbon tetrachloride was recovered by the SVE system. Treated
soils were reinstated after rigorous quality testing to ensure site
remediation action levels were met. Concrete removed from below ground
structures and foundations was reclaimed and used in the reinstatement of
the excavation.
Segregated clays were sent to landfill for disposal.
This
former gasworks site had a dissolved phase BTEX, PAH and petroleum
hydrocarbon plume with an area of two hectares.
The remediation system incorporated 271 sparge/SVE wells and was
designed after detailed pilot testing.
The remediation strategy was based on aerobic bio-degradation of
the target compounds of BTEX and petroleum hydrocarbons, with physical
removal where concentrations were highest.
A programme of localised DNAPL
and LNAPL
recovery was also undertaken.
The
site is an operational laundry overlying a fractured mudstone.
LNAPL made up primarily of white spirit is present, with measured
in-well thicknesses of up to 4m. RemedX
have reviewed existing site data, designed and conducted a remediation
pilot testing stage. Based on
this data a full scale remedial design was developed.
The full scale remediation system is now fully operational with
RemedX advising on its operation.
Installation
and Operation of an LNAPL Vacuum Enhanced Skimming System, 2003 – on
going, Powergen.
RemedX
Ltd is Principle Contractor. The
system is operating on the site of a former power station.
The LNAPL
being recovered from a shallow gravel aquifer is diesel fuel.
Pilot
Testing of a Multi-Phase Extraction System for in-situ remediation of
Chlorinated Hydrocarbons within weathered mudstone, 2002 - Ongoing
RemedX
have completed pilot testing of Multi-phase extraction applied to a low
permeability mudstone contaminated with trichloroethene.
During the pilot trials DNAPL
was recovered for the first time at the site.
The pilot testing data is being used to recommend full scale
remedial options for the site.
Design,
fabrication and installation of a water treatment plant for removal of
chlorinated solvents from groundwater, 2000
RemedX
are providing and operating plant to meet an environmental consultant's
specification for the installation and operation of a pump and treat
remediation scheme. The
scheme requires pumping from 5 groundwater recovery wells and treating
groundwater prior to discharge to a foul sewer.
The contaminants being removed are trichloroethylene and its
degradation products. The
treatment technologies being employed by RemedX are ‘shallow tray’
type air stripping followed by granular activated carbon.
The treatment system is mounted within a portable steel building
and incorporates a process logic control (PLC) system.
Feasibility Study of
In-situ Bioventing for Treatment of Hydrocarbon Contaminated Soil for
Railtrack, Chester, UK, 1999
RemedX
undertook further site investigation of part of the site targeted for
remediation, which spanned operational rail lines. A pilot soil vapour extraction test was performed to
determine the subsurface suitability for bio-venting and to determine air
permeabilities and radii of influence.
An aerobic bio-remediation laboratory bench test was performed to
assess the effectiveness of bioremediation as a means of treating the
soils in-situ. The
bench test indicated that a 95% reduction in total petroleum hydrocarbon
concentration in soils at the site was possible through aerobic
bio-remediation. A full scale
remediation scheme was designed and priced based on the pilot scale test.
Design and
installation of an In-situ Remediation Scheme for the Treatment of TCE
Contaminated Groundwater and Soils, UK, 1999 - 2000
The
site is an operational factory, with the remediation works being
undertaken beneath the factory floor.
RemedX found and removed an underground steel tank containing free
phase TCE. Air sparge and SVE
wells were installed around the tank site to treat secondary sources of
TCE within a shallow aquifer. Pilot
SVE and air sparging trials were undertaken and a full scale system
designed. Installation of the
system is currently underway.
Further
Site Investigation and Characterisation of a Shallow Aquifer Contaminated
with Chlorinated Ethenes. Assessment
of Intrinsic Anaerobic Bioremediation Processes, UK, January – March
2000
A
former coatings factory in the UK overlies a shallow aquifer containing
dissolved phase chlorinated ethenes.
Intrinsic anaerobic bacterial activity was identified and
quantified to assess if it alone was sufficiently sustainable to degrade
the contamination present. It
was determined that the natural processes were capable of degrading a
significant proportion of the dissolved phase contamination present, but
that insufficient carbon source material was present within the aquifer
for complete removal. Carbon
source supplementation within the aquifer was recommended for successful
in-situ anaerobic bioremediation of the aquifer.
A remedial scheme was proposed by RemedX and is being considered by
the Environment Agency and the client. Back
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