B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/98
B01D 24/22 (2006.01)
Patent
CA 1126172
ABSTRACT OF THE DISCLOSURE A treatment facility has a granular media bed for use in acting upon (e.g. filtering) liquid mixtures, such as industrial and municipal water and wastewater, and employs a backwash operation between treatment operations for clean- ing or otherwise enhancing the quality of the bed. A control system for the backwash operation establishes a first back- wash rate for washing and scouring the granular media to re- lease suspended solids and/or other impurities from the bed. Thereafter the control system establishes a second and generally greater rate for removing the released impurities from the facility. Preferably the first rate is chosen to just com- pletely fluidize the granular bed, at which point a pressure responsive control system detects a constant differential pressure (i.e. a zero change in differential pressure), and the second rate, which generally is greater than the first rate, is responsive to the temperature of the backwash liquid.
329770
Neuspiel Peter J.
Roberts Charles V.
Sarra William F.
Barrigar & Moss
Roberts Filter Manufacturing Company
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