In 2006 Trafigura chartered the Probo Koala, a tanker, to carry coker naphtha. The vessel carried out a procedure for caustic washing on several such cargoes and needed to treat a relatively small amount of residual waste (often referred to as ‘slops’). The discharge and treatment of slops and waste materials from all vessels, including crude oil and product carriers, is an everyday occurrence around the world.
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