Method of changing operating modes in automatic water filtering apparatus using tubular membranes
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United States of America Patent
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Nov 19, 1991
Grant Date -
N/A
app pub date -
Oct 31, 1990
filing date -
Aug 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of changing operating modes in automatic water filtering apparatus comprising inside-skin tubular membrane modules for filtering water, the possible filtering modes being: dead-end filtering; cross-flow filtering; and cross-flow filtering with continuous purging; both cross-flow filtering modes including recirculation in a loop; wherein two types of triggering are provided for filter membrane backwashes, a first one of said types being related to time periods between two backwashes, which time periods are predetermined for each mode of filtering, and a second one of said types being related to reference values of an operating parameter of the automatic apparatus, which values are predetermined for each mode of filtering; with the mode of filtering being changed after a backwash has been triggered in response to one of the reference values, with changes taking place in the following order: dead-end filtering, cross-flow filtering, cross-flow filtering with continuous purging, or vice versa.
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