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In-Situ Conductive Heating
Cornelsen has undertaken one of the only in-situ thermal conductive heating projects in the UK together with Reconsite GmbH. This pilot scale project was conducted on a disused petrol filling station in the South of England for and with Arcadis Geraghty and Miller. A detailed case study will be uploaded in the near future.
In summary, the site had been treated to the maxium effect possible using soil vapour extraction (SVE) and air sparging. The geology is predominantly clayey fine silt. Prior to heating, contaminant mass removal had reached very low asymptotic levels and the site closure accepted by the Environment Agency.
The in-situ heaters, with a power consumption of only 3.5kW were gradually brought up to temperature with simultaneous SVE. The maximum temperature achieved for the heaters was 450 oC, with temperatures exceeding 90 oC in the formation in between - groundwater was boiled off.
During the course of this trial, over a period of 90 days, circa 80kg of benzene equivalent product was extracted by the SVE, at one point reaching 20 kg in one day. In fact, as the trial was begun very slowly due ensure safe concentrations, the relevant period is really closer to 50 days from the point of heating to a rapid tail-off in mass removal.