Catalyst – solid sorbent – or support therefor: product or process – Solid sorbent – Having specifically intended extraneously added iron group...
Reexamination Certificate
2005-02-24
2009-06-09
Vanoy, Timothy C (Department: 1793)
Catalyst, solid sorbent, or support therefor: product or process
Solid sorbent
Having specifically intended extraneously added iron group...
C502S423000, C588S256000, C428S403000
Reexamination Certificate
active
07544636
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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Berns Daniel
The Regents of the University of California
Townsend and Townsend / and Crew LLP
Vanoy Timothy C
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