Mobile Clarifi Cation for Seleniu M r e Moval fro M r efinery Wa Ste Water In 2007, a large refiner contacted Evoqua Water Technologies for assistance with reduction of selenium below a 12 ppb discharge limit. Selenium is a component in fossil fuels such as coal and crude oil and an essential nutrient at low levels. In high doses released to the environment it can accumulate and have toxic effects in both plants and animals in the ecosystem

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