Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2009-05-18
2010-10-26
Savage, Matthew O (Department: 1797)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S912000
Reexamination Certificate
active
07820052
ABSTRACT:
A method for low-cost arsenic removal from drinking water using chemically prepared bottom ash pre-treated with ferrous sulfate and then sodium hydroxide. Deposits on the surface of particles of bottom ash form of activated iron adsorbent with a high affinity for arsenic. In laboratory tests, a miniscule 5 grams of pre-treated bottom ash was sufficient to remove the arsenic from 2 liters of 2400 ppb (parts per billion) arsenic-laden water to a level below 50 ppb (the present United States Environmental Protection Agency limit). By increasing the amount of pre-treated bottom ash, even lower levels of post-treatment arsenic are expected. It is further expected that this invention supplies a very low-cost solution to arsenic poisoning for large population segments.
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Savage Matthew O
The Regents of the University of California
Townsend and Townsend / and Crew LLP
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