Method of using indicator means for liquid purification filter

Details Method of using indicator means for liquid purification filter Method of using indicator means for liquid purification filter

1996-12-11

1998-11-03

Drodge, Joseph W.

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210745, 210767, 356436, 436164, B01D 3700, B01D 35143, G01N 2100

Patent

active

058303677

ABSTRACT:
A method of monitoring the removal by a filter medium of a target substance from a liquid passing through the filter medium. The method involves: providing an indicator providing a filter medium having a plurality of binding sites which have a first affinity for the target substance and a second affinity for the indicator introducing the indicator means into the liquid; passing the liquid through the filter medium; and determining the presence or absence of the indicator in the liquid which has passed through the filter medium. The first and second affinities are adapted to require binding of the indicator by the filter medium only so long as binding sites are available to the target substance. Thus, the indicator means is adapted to compete with the target substance. As a practical matter, the liquid typically will be water. The indicator may denote when the filter medium is not effective by altering the taste of the water passing through the filter medium. Alternatively, the indicator may denote when the filter medium is not effective by altering the color of the water passing through the filter medium. For example, the indicator may impart a color to the water passing through the filter medium.

REFERENCES:
patent: 3664095 (1972-05-01), Asker et al.
patent: 5110479 (1992-05-01), Frommer et al.
patent: 5114570 (1992-05-01), Nelson et al.
patent: 5494744 (1996-02-01), Everhart et al.
Derwent WPI Abstract for JP 03-284,349 dated Dec. 16, 1991.
Derwent WPI Abstract for SU 1,807,004 dated Apr. 7, 1993.

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