Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2007-07-24
2007-07-24
Savage, Matthew O. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S668000, C210S670000, C210S679000, C210S695000, C210S712000, C210S717000, C210S911000
Reexamination Certificate
active
10039947
ABSTRACT:
Methods for removing arsenic from water by addition of inexpensive and commonly available magnesium oxide, magnesium hydroxide, calcium oxide, or calcium hydroxide to the water. The hydroxide has a strong chemical affinity for arsenic and rapidly adsorbs arsenic, even in the presence of carbonate in the water. Simple and commercially available mechanical methods for removal of magnesium hydroxide particles with adsorbed arsenic from drinking water can be used, including filtration, dissolved air flotation, vortex separation, or centrifugal separation. A method for continuous removal of arsenic from water is provided. Also provided is a method for concentrating arsenic in a water sample to facilitate quantification of arsenic, by means of magnesium or calcium hydroxide adsorption.
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Anderson D. Richard
Moore Robert C.
Sandia Corporation
Savage Matthew O.
Watson Robert D.
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