Liquid purification or separation – Flow – fluid pressure or material level – responsive – Maintaining stream pressure or flow
Patent
1989-10-13
1991-10-29
Cintins, Ivars
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Maintaining stream pressure or flow
210149, 210266, 210282, 210350, B01D 2702, C02F 900
Patent
active
050613677
ABSTRACT:
A filter cartridge for treating drinking water to remove a broad range of microorganisms includes a microbiocidal resin layer, a porous activated carbon filter element and a flow controller to assure a minimum effective residence time of water in the filter under varying pressure conditions. The microbiocidal resin preferably comprises a halogenated resin bed which is effective to kill a broad range of bacteria, viruses and protozoan cysts. The five micron carbon filter element removes any particularly resistant cysts which may have survived passage through the resin bed. The filter may also be provided with a scavenger resin downstream of the haogenated resin bed to remove any free halogens from the final effluent. A buffering resin may also be included upstream of the halogenated resin bed to precondition high pH supply water. Compensation for the decreased microbiocidal activity of the halogenated resin with decreasing supply water temperature may be provided by a temperature sensitive flow control valve which increasingly restricts the flow of supply water into the filter with decreasing water temperature.
REFERENCES:
patent: 3327859 (1967-06-01), Pall
patent: 3950251 (1976-04-01), Hiller
patent: 4147631 (1979-04-01), Deines et al.
patent: 4594392 (1986-06-01), Hatch
patent: 4714546 (1987-12-01), Solomon et al.
patent: 4764274 (1988-08-01), Miller
patent: 4769143 (1988-09-01), Deutsch et al.
Hatch Gary L.
Polasky Ralph A.
Ametek Inc.
Cintins Ivars
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