Removal of Selenium from Oil Refinery Process Wastewater Using ABMet® Process

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Abstract:

The objective of this study was to evaluate potential of the ABMet® process for removal of selenium from two refinery wastewater streams, including the refinery's activated sludge plant (ASP) effluent and sour water stripper bottom streams. The ABMet® process is an anoxic biological reduction process effective in reducing selenite and selenate to elemental selenium. While the ASP effluent contains mainly selenite with some selenate, the stripped sourwater (SSW) contains selenocyanate (SeCN). The anoxic selenite and selenate respiring bacteria are not capable of reducing SeCN. Therefore, four oxidants were tested on the SSW samples in order to convert SeCN to selenite and selenate. The ASP effluent and SSW streams were tested using a bench-scale flow-through testing system. The ABMet® process was able to reduce the selenium concentration of the ASP effluent from 368 to 2.3 micrograms per liter (μg/L) and the selenium concentration of the pre-oxidized SSW from 2,510 to 11.7 μg/L.
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