Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1993-09-13
1995-04-04
Drodge, Joseph W.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
73 6163, 738659, 210 961, 436 10, 436164, B01D 1712
Patent
active
054034973
ABSTRACT:
A method for monitoring water filter performance and efficiency, by correlating particle size and distribution to turbidity measurement. The method includes the steps of installing and calibrating the filter system, and periodically testing the filter system efficiency. The calibration of the filter system includes the step of preparing a calibration "challenge" solution having a predetermined count of particles of known size which will serve as "surrogates" for the particles which are to be removed during normal filtration. The turbidity of the calibration challenge solution is measured, and correlated to the particle count information. Similarly, the effluent turbidity is measured and a particle size distribution count made to verify the percent removal specified.
REFERENCES:
patent: 1859035 (1932-05-01), Hall
patent: 2361235 (1944-10-01), Pick
patent: 3505876 (1970-04-01), Niebergall
patent: 5135662 (1992-08-01), Ho
Publication by John L. Cleasby "Turbidimetric Control of Filter Effluent Quality", Journal of AWWA Nov. 1960 pp. 1411-1415.
"Evaluation of Particle Counting as a Measure of Treatment Plant Performance", by E. A. Hargesheimer et al., pp. 45, 66 and 67, published by the AWWA Research Foundation in 1992.
Drodge Joseph W.
Regents of the University of California
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