BP Amoco used low temperature thermal technology to remove volatile aromatic organic compounds from sandy soils. The trial, carried out on 40t of contaminated material by the Environmental Services Group of British Aerospace, was aimed at evaluating the risks and costs associated with ground clean up in a raw material and storage area.
Four batches of contaminated material were prepared for the trial with aromatic concentrations of 0.25%, 0.5%, 1% and 2%. Each batch was desorbed at between 200degreesC and 300degreesC.
The 0.25%, 0.5% and 1% materials were successfully treated at feed rates close to a maximum capacity of 22t/hour. Oxidisation of the 2% material caused extremely high temperatures of more than 950degreesC. Feed rate was lowered to 16t/hour to reduce operating temperatures. The report is due for release in March.