Introductory Information
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Site name:
In-Situ Soil and Groundwater Decontamination using Electric Resistive Heating Technology (Six Phase Heating) at Ecclesfield, Sheffield
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Project name:
In-Situ Soil and Groundwater Decontamination using Electric Resistive Heating Technology (Six Phase Heating)
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Reasons for project initiation:
A two hectare site in Sheffield, close to the M1, formerly a tool manufacturing facility for in excess of 50 years, was acquired by Taylor Wimpey for proposed residential redevelopment. The site was almost surrounded by existing high density housing.
Extensive sampling of the site revealed two source areas of contamination, totaling approx 3,500 cubic meters of soils and approx 630 cubic metres of groundwater. Geological surveys showed an upper layer of Made Ground, underlain by cohesive clays, silts and sands to between 3m - 4m below ground level (bgl) over dense mudstone. Groundwater was recorded at between 3m and 4.1m bgl. Chemical analysis of soils revealed two distinct hotspots of chlorinated hydrocarbons. Contaminants of concern were identified as Trichloroethene (TCE) - human health risk and environmental risk, and Vinyl Chloride (VC) - human health risk.
Site Specific Acceptance Criteria were set at 80% reduction in TCE in both soils and groundwater, and 50% reduction in VC.
A review of available technologies, followed by a Risk Analysis and Cost/Benefit Analysis highlighted Six Phase Heating as a suitable technology. Other influencing factors were : Very low level of local disruption, Reduced remediation timescale, Low risk of cost escalation, and Thoroughness of the process.
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Pollution origin:
Former tool manufacturing facility for in excess of 50 years.
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Site size: 2 hectares hectares
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Country where the demonstration took place:
United Kingdom
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Scale of demonstration: Demonstration
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Status: Fully Commercialised
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Principal media targeted for remediation: Soil and Groundwater
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Comments field / opportunity to reference any national verification achieved?
A rigorous validation regime was undertaken by independent consultants. Both soil and groundwater samples were recovered and tested to confirm that the concentrations of TCE and VC were below the Site Specific Acceptance Criteria. Separate samples were recovered from the treatment zone four weeks after project completion. These samples showed that soil moisture had returned to normal, and no signs of 'heave' or desiccation were recorded.
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Remediation Type(s) Table:
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Remediation Type(s): |
The Technologists Official Name: |
Insitu / Ex situ technique: |
This technology was primarily used to deal with: |
| 1. |
Electrical Resistive Heating (in & ex situ) |
Six Phase Heating |
Insitu |
Source removal (soil/gw) |
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Contaminants Targeted For Remediation Table:
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Remediation Type |
Contaminant Species
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Media
(Soil/Soil Gas etc)
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Underground Unit
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Start Max Conc.
mg/kg, mg/l, % (air)
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Start Min Conc.
mg/kg, mg/l, % (air)
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End Max Conc.
mg/kg, mg/l, % (air)
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End Min Conc.
mg/kg, mg/l, % (air)
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1.
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Electrical Resistive Heating (in & ex situ) |
Vinyl chloride
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Groundwater
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Cohesive clays, silts and sands
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2.
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Electrical Resistive Heating (in & ex situ) |
Trichloroethylene
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Soil
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Made Ground
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202.38
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2.34
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3.
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Electrical Resistive Heating (in & ex situ) |
Trichloroethylene
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Soil
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Cohesive clays, silts and sands
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202.38
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2.34
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4.
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Electrical Resistive Heating (in & ex situ) |
Trichloroethylene
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Soil
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Dense mudstone
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202.38
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2.34
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5.
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Electrical Resistive Heating (in & ex situ) |
Vinyl chloride
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Soil
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Made Ground
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0.715
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0.013
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6.
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Electrical Resistive Heating (in & ex situ) |
Vinyl chloride
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Soil
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Cohesive clays, silts and sands
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0.715
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0.013
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7.
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Electrical Resistive Heating (in & ex situ) |
Vinyl chloride
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Soil
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Dense mudstone
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0.715
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0.013
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8.
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Electrical Resistive Heating (in & ex situ) |
Trichloroethylene
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Groundwater
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Cohesive clays, silts and sands
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49.545
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5.12
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9.
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Electrical Resistive Heating (in & ex situ) |
Trichloroethylene
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Groundwater
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Dense mudstone
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49.545
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5.12
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10.
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Electrical Resistive Heating (in & ex situ) |
Vinyl chloride
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Groundwater
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Dense mudstone
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Project participants table:
| | Organisation | Role |
| 1. |
Terra Vac (UK) Ltd
Full Details
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Contractor / operator
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Further Information
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* Further information in linked pages
Technology & Application*
Further Project Info & Outputs*
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Web link to further information:
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Contact Information
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Submitted by:
Ms Jane Moulson 20/06/2008 10:40:00
Who does what?
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Association to this Demonstration Project:
I work for the Remediation Designers
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