2006 Ivory Coast toxic waste dump by Greek shipping company Prime Marine Management Inc. and chartered by Trafigura. Trafigura desired to strip the sulfurous products out of the coker gasoline to produce naphtha, which could then be sold. Instead of paying a refinery to do this work, Trafigura used an obsolete process on board the ship called "caustic washing", in which the coker gasoline was treated with caustic soda. The process worked, and the resulting naphtha was resold for a reported profit of . The waste resulting from the caustic washing would typically include hazardous substances such as sodium hydroxide, sodium sulfide and phenols. On 2
2006 Ivory Coast toxic waste dump July 2006, the "Probo Koala" called at Amsterdam port in the Netherlands to discharge the slops contained in the vessel's dedicated slops tanks. During the transfer such a foul smell was released onto the city that the disposal company Amsterdam Port Services B.V. (APS) decided to consult with the city of Amsterdam. After half the waste was transferred APS increased the handling fee 30-fold. APS then informed the ship's master that authorities had given permission for the slops previously removed to be returned to the vessel. The Probo Koala departed Amsterdam on 5 July 2006 for Paldiski, Estonia, with the