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An ion exchange process that removes contaminants from water, e.g., nitrate, fluoride, phosphate and/or arsenic, with simultaneous desalination, where CO2 is the sole regenerant.
About
An ion exchange process that removes contaminants from water, e.g., nitrate, fluoride, phosphate and/or arsenic, with simultaneous desalination, where CO2 is the sole regenerant. The ion exchange process may include two beds: Bed #1 = hybrid anion exchanger with zirconium oxide nanoparticles (i.e., HAIX-NanoZr), Bed #2 = protonated weak-acid cation exchange fibers (i.e., WAC-Fiber). In conventional demineralization, the cation exchanger always precedes the anion exchanger and acids and alkalis are used as regenerants. This ion exchange based invention is distinctive by: first, a hybrid anion exchanger with dual functional groups precedes the weak-acid cation exchange fiber (i.e., an anion exchanger preceding a cation exchanger); second, no mineral acid or alkali is needed for regeneration; and third, in addition to desalination or demineralization, specific contaminants, namely, arsenic, fluoride, phosphate and nitrate, may also be removed selectively. The first column in the two-bed ion exchange process contains HAIX-NanoZr in bicarbonate form while the second one has the weak acid cation exchange fibers (WAC-Fibers) in hydrogen form. Besides removal of contaminants like nitrate, fluoride, phosphate and arsenic removal, the process achieves desalination, i.e., simultaneous reduction in the total dissolved solids (TDS).
Key Benefits
An ion exchange process that removes contaminants from water, such as nitrate, fluoride, phosphate and arsenic with simultaneous desalination and applies CO2 as the sole regenerant. Seectively adsorb arsenate, arsenite, fluoride and phosphate. The process does not generate spent regenerant containing chemicals that were not originally present in the raw or feed water.
Applications
Waste Water Treatment