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Arsenic Removal Technology In Drinking Water Dec 22, 2014

In water, the most common valence states of arsenic are As , or arsenate, which is more prevalent in aerobic s

urface waters and As,or arsenite, which is more likely to occur in anaerobic ground waters. In the pH range of

4 to 10, the predominant As compound is neutral in charge, while the As species are negatively charged.

Removal efficiencies for As(III) are poor compared to removal As by any of the technologies evaluated due to

the negative charge.


         

Ion Exchange (IE) can effectively remove arsenic. However, sulfate, TDS, selenium, fluoride, and nitrate compete with arsenic and can affect run length. Passage through a series of columns could improve removal and decrease regeneration frequency. Suspended solids and precipitated iron can cause clogging of the IE bed. Systems containing high levels of these constituents may require pretreatment. 

 

Research recently completed by the University of Houston (Clifford) at McFarland, CA and Albuquerque, NM has shown that ion exchange treatment can reduce arsenic (V) levels to below 2 µg/L even with sulfate levels as high as 200 mg/L. Sulfate does impact run length, however; the higher the sulfate concentration, the shorter the run length to arsenic breakthrough. The research also showed the brine regeneration solution could be reused as many as 20 times with no impact on arsenic removal provided that some salt was added to the solution to provide adequate chloride levels for regeneration. Brine recycle reduces the amount of waste for disposal and the cost of operation.