Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1978-06-23
1980-02-05
Adee, John
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 82, 210108, 210149, 210275, B01D 2324
Patent
active
041871758
ABSTRACT:
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 cleaning or otherwise enhancing the quality of the bed. A control system for the backwash operation establishes a first backwash rate for washing and scouring the granular media to release 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 completely 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.
REFERENCES:
patent: 1892951 (1933-01-01), Hughes
patent: 2376912 (1945-05-01), Green
patent: 2538340 (1961-01-01), Tomek et al.
patent: 2858024 (1958-10-01), Babcock
patent: 2902158 (1959-09-01), Muller
patent: 3931009 (1976-01-01), Davis
Neuspiel Peter J.
Roberts Charles V.
Sarra William F.
Adee John
Robert Filter Manufacturing Company
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