Selenium Removal

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Courtesy of Integrated Engineers Inc.

The oil refinery was in search of a feasible solution for the removal of selenium. Discharge permit changes by the EPA require a reduction of 50% from current levels.

Integrated Engineers, Inc. was given an opportunity to perform a feasibility test to determine a treatment process as well as estimated operational costs. The best process was to adjust the pH from 7.0 to 10.0 using caustic, utilization of a metal precipitant (IE- 061) with ORP (oxidation reduction potential) control, followed by addition of Floccin-D to encapsulate the selenium.

The ORP was stable at –312 mV so no additional IE-061 was added. Floccin-D was added at a dosage of 800 ppm (which might be reduced as the water clarity was excellent). The settled water was decanted and tested for Selenium using EPA Method 200.8.

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