Selenium Removal Using Chemical Oxidation and Biological Reduction
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United States of America Patent
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Issued Date -
Feb 2, 2012
app pub date -
Jul 27, 2010
filing date -
Jul 27, 2010
priority date (Note) -
Abandoned
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Abstract
Selenium in the form of a reduced species such as selenocyanate is oxidized to produce an oxidized selenium species such as selenate or selenite, and then a biological reduction process is used to remove selenium from the oxidized selenium species. In an example, a chemical oxidant is added to a wastewater containing selenocyanate to produce selenate and selenite. The partially treated wastewater is then fed to a reactor containing a fixed media supporting a biofilm with selenium reducing organisms. The selenium in the selenate and selenite is reduced to an insoluble form of selenium, such as elemental selenium, which precipitates from the wastewater.
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