Alan L. MeierKrofta Engineering Corp.Lenox, Mass. Ognjen NikolicINA Oil Refinery Rijeka, Croatia A new approach to waste water treatment at a refinery in Croatia produces effluent that not only meets the region's regulations for disposal into the Adriatic Sea, but also sur- passes the refinery's specifications for recycling process water. Key to the dramatic reduction in pollutants was the installation of a Sandfloat unit developed by Krofta Engineering Corp. The Sand-float unit is a dissolved air flotation clarifier that combines flocculation, flotation, and multilayer filtration to produce high-quality eff...

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