Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2006-03-07
2006-03-07
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S668000, C210S694000, C210S721000, C210S725000, C210S727000, C210S752000, C210S754000, C210S760000, C210S764000
Reexamination Certificate
active
07008543
ABSTRACT:
A method of oxidation or pathogen inactivation in water supplies using the combination of treatments of chlorine dioxide and ozone in the sequential steps prior to filtration and distribution. Results indicate that the addition of chlorine dioxide before prezonation reduces the bromate formation and chlorine dioxide can be substituted for preoxidation with ozone, while maintaining the enhanced filtration effects observed from the presence of a preoxidant. A majority of the chlorite formed from reactions of chlorine dioxide with constituents in raw water are converted to chlorate by the following ozonation step.
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Neemann, Jeff, Combining Chlorine Dioxide and Ozone to meet Multiple Treatment Goals, International Ozone Conference, Raleigh, NC, May 2002.
Neemann Jeffrey John
Newkirk Dale Darrow
Zhou Xuejun
Contra Costa Water District
Hruskoci Peter A.
Pacini Harry A.
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