Chemical herding of weathered crude oils for in-situ burning

Ulises Rojas-Alva*, Bjørn Skjønning Andersen, Grunde Jomaas

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Mid-scale ISB experiments were conducted in a large water-basin (20 m2 × 1 m) in order to assess the applicability of chemical herding of weathered crude oil spills on water in association with in-situ burning (ISB). A silicone-based chemical herding agent, OP-40, was used to confine, or herd, three different crude oils (Siri, Grane and Oseberg blend) at various weathering degrees. The herding agent was capable of obtaining the minimum required oil slick thickness for ignition and subsequent flame spread in most of the experiments, but not for the strongly weathered oils. Also, the herding agent was capable of re-thickening the oil slick after flame extinction. The burning efficiency results indicate that the method can be viable for ISB with herders at a larger scale, and suggest that the burning efficiency scales with the amount of crude oil. Sinking behaviour of residues was also observed and quantified, as such a behaviour can pose a serious environmental threat in real scenarios.
Original languageEnglish
Article number109470
JournalJournal of Environmental Management
Number of pages11
Publication statusPublished - 2019


  • Oil spill
  • Herding
  • Burning efficiency
  • Regression rate
  • Pollution


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