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Many industrial wastewaters, particularly those associated with mining and mineral processing and certain groundwaters, contain high concentrations of sulfate. Sulfide oxidation is a common process in many mined ores but these concentrations typically exceed the secondary drinking water standard of 250 mg/l and may be subject to discharge limits between 250 and 2000 mg/l.
Removal of calcium sulfate and other low solubility sulfates is very difficult for reverse osmosis systems because the precipitate causes significant fouling. Expensive pre-treatment operations are needed to for proper.
The RDI™ Desalination System offers a cost-effective alternative to conventional technologies for treating this water as the system can tolerate high levels of these sulfates without pre-treatment.