Method of changing operating modes in automatic water filtering

Details Method of changing operating modes in automatic water filtering Method of changing operating modes in automatic water filtering

1990-10-31

1991-11-19

Jones, W. Gary

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210739, 210791, 210138, 21032187, 21033301, 2103331, 210411, B01D 6120, B01D 2966

Patent

active

050664026

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.

REFERENCES:
patent: 4482461 (1984-11-01), Hindman et al.
patent: 4657040 (1987-04-01), Torres
patent: 4844804 (1989-07-01), Taylor
patent: 4921610 (1990-05-01), Ford et al.

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