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In situ burning

This technique was used intensively during the response to the Deepwater Horizon blowout. Cedre studies the possibility of implementing this technique according to the type of oil and its degree of weathering.

Cedre has developed a test facility to assess the in situ burning option, both in terms of efficiency and of potential impacts.

This facility recreates the burn conditions for an oil slick. The protocol can be applied to fresh crude oils or to samples weathered in the laboratory.

Around 100 grams of samples (fresh crude oil or oil topped (distilled) at 150, 200 and 250°C, the 250°C residue can also be photo-oxidised) are placed in the Cedre combustion cell and ignited.

The purpose of these trials is to assess the ignition of the oil (with the addition of diesel, if it cannot be directly ignited) and to determine the efficiency of the technique.

In addition to this assessment, density measurements and quantification of polycyclic aromatic hydrocarbons (list of 43 compounds or groups of compounds) are performed in the water column, enabling the potential effects on the environment to be evaluated (comparison of concentrations measured during the trials and without burning). The PAHs are also quanified in the different burn residues.