Liquid purification or separation – Serially connected distinct treating with or without storage... – With storage unit
Patent
1997-06-10
1999-09-28
Fortuna, Ana
Liquid purification or separation
Serially connected distinct treating with or without storage...
With storage unit
210660, 210663, 210282, 210 87, 210670, 21033301, B01D 6300
Patent
active
059582324
ABSTRACT:
A reverse osmosis drinking water treatment system with a backwashable precise prefilter unit includes a super precise filter, a pressure pump and its automatic control system, a reverse osmosis membrane (or a nano-filtration membrane), a pressure tank, a post filter, and a drinking water dispensing apparatus. In front of the super precise filter, there is an independent backwashable precise prefilter unit. This unit is composed of three filter columns: the first packed with quartz sand, the second with a Cu--Zn alloy of high purity, and the third with sintered microporous PE. A five channel ball valve connects the water supply with the backwashable precise prefilter unit, and then with the super precise filter. The five channel ball valve has three different working positions, namely, a cleaning water position, a discharging water position, and a backwashing position. The useful life of this backwashable precise prefilter unit can be more than three years.
REFERENCES:
patent: 4317721 (1982-03-01), Pynnonen
patent: 4342651 (1982-08-01), Ahrens
patent: 5094742 (1992-03-01), Miller et al.
patent: 5281338 (1994-01-01), Harris
patent: 5510027 (1996-04-01), Tejada
patent: 5632892 (1997-05-01), Klein
Han Book of Industrial Membranes p. 529, Fig. 4, 1st. Ed.
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