Selenium Treatment

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Selenium Treatment
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Selenium is a naturally occurring non-metal element that can be found in groundwater and wastewater in various states of oxidation. Selenium will typically exist as selenate or selenite in the ground water depending on the groundwater oxidation potential. Both selenate and selenite are highly soluble, divalent anions that are not easily precipitated and removed with conventional water treatment processes.

E-PLUS ZVI Media

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newterra’s E-PLUS Zero Valent Iron (ZVI) media can be applied as a packed-bed reactor that donates electrons to the selenium ions, allowing the selenium to be reduced down to elemental selenium and adhered to the media surface. The media uses elemental iron as the electron donor and produces dissolved ferrous iron into the water as a byproduct of the reduction reaction. Our media is specifically designed to prevent plugging and fouling over extended operating cycles.

newterra’s Iron Removal Systems (IRS)

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newterra’s IRS technology has proven to be the best available technology for removal of iron in the concentration range typically found on the outlet of our E-PLUS ZVI media. This technology is applied for iron polishing downstream of the E-PLUS ZVI media and plays an integral role in removal of excess iron, TSS and co-precipitated metals.

Reverse Osmosis (RO)

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RO technology can be applied for selenium rejection in selected applications where there is an efficient solution for disposal of the concentrate wastewater.

Ion Exchange

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Ion exchange is also an effective method of reducing selenium in the water. Anion exchange resins will exchange selenium ions in the water for chloride or other non- regulated monovalent ions on the resin. Ion exchange is often limited in groundwater applications to the background sulfate in the water. Sulfate, if found in high concentration, will load onto an anion exchange resin decreasing throughput and increasing waste volumes beyond practical levels.

Filtral Metal Removal Media

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Filtral is an economic disposable ion exchange type media with both cation and anion exchange properties. Filtral, with pH reduction, is capable of removing selenite ions in water but typically has less effect on removal of selenate ions. High concentrations of other anions including sulfates, phosphates and fluorides can interfere with Filtral performance and should be pre-screened prior to piloting.