Abstract
When oil spills in the coastal environment, the spilled oil may interact with the suspended particulate matter in the water column to form oil-SPM aggregates (OSAs). This process has been recognized to enhance natural cleansing of oiled shorelines. This laboratory study was conducted using SPM samples with different particle size distribution and mineral composition, two crude oil samples, filtered natural seawater, and a reciprocating shaker. The sediment-to-oil ratio was kept constant to 1 in all the experiments. The oil trapped in negatively buoyant OSAs was measured using an Infrared Oil Content Analyzer. Results showed that OSA formation increased with the decrease of the sediment size, the maximum oil trapped in settled OSAs was 182 mg oil/ g sediment when OSAs were formed with kaolinite and CST180 crude oil.
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