The Cheyenne Refinery is Monitoring Selenium Levels in Real-Time

HollyFrontier Cheyenne Refining LLC, a subsidiary of HollyFrontier Corp., Dallas, has purchased and installed the MetalGuard™ Selenium online analyzer from Aqua Metrology Systems (AMS) to measure the wastewater selenium profile at the Cheyenne Refinery, Cheyenne, Wyoming.

The Cheyenne Refinery, with a crude oil capacity of 52,000 barrels per day, is using an advanced bioreactor technology to remove selenium from their wastewater. Selenium analysis on influent and effluent levels is required to optimize and measure bioreactor performance. Analytical results from standard methods can take up to two weeks to be returned, whereas the MetalGuard analyzer provides real-time data on selenite/selenate levels. The MetalGuard instrument is unique in its ability to provide online measurements in less than two hours with accuracy from 1 - 10,000 ppb or ± 15%; whichever is higher for inorganic/organic selenium.
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