Aqueous-Waste Treatment

The aim of Centrifuges Un-Limited’s ELVOS waste-treatment unit (Fig. 6) is to split a primarily aqueous waste containing oil-based-mud solids and oil into clean water (for discharge to sea), clean oil (to be recovered and recycled as a fuel), and solids (for disposal or for further thermal treatment at the source). This separation is achieved by use of a three-stage process. Stage 1 removes the heaviest of the solids from the aqueous waste, clarifying the liquid so that only ultrafine particles remain. Stage 2 removes the finer solids and splits off most of the oil. Stage 3 is the final polishing step for the water, removing any remaining particulates and traces of oil from the effluent. Before discharge, the final effluent is tested to confirm that the hydrocarbon level is less than 30 ppm. The unit can be operated safely by one person and uses minimal consumables. Its small footprint requires less space than a 20-ft container. The system is capable of reducing oil-in-water content to less than 5 ppm, to meet the strictest standards and operate within the world’s most environmentally sensitive locations.

Fig. 6: Centrifuges Un-Limited’s ELVOS waste-treatment unit



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