Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1988-01-13
1989-01-03
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210678, 210683, 210 961, 210143, 210190, 210279, 210288, C02F 128
Patent
active
047955635
ABSTRACT:
An improved unit for removal of nitrates from water is disclosed, which features a cylindrical tank containing a nitrate-adsorbing resin bed and a dip tube/water distributor assembly. The assembly comprises a dip tube extending from an orifice in the upper portion of the tank to a lower distributor assembly, and an additional backflush tube having an open end disposed near the lower distributor assembly and communicating with an upper distributor located beneath the surface of the resin. A water flow restrictor is provided in the lower distributor assembly, such that when water is passed downwardly through the dip tube in a backflush mode, some of the water is squirted into the additional backflush tube, so that the backflush water flows into the resin bed at both its lower and upper portions. In this way, the resin bed is more effectively regenerated by subsequent supply of a brine solution than if the rinse water were only injected at the lower portion of the resin bed. This improved efficiency allows use of the nitrate-adsorbing resin bed for simultaneous removal of iron from the water stream.
REFERENCES:
patent: 3395099 (1968-07-01), Johnson
patent: 3455458 (1969-07-01), Johnson
patent: 3467022 (1969-09-01), Techler et al.
patent: 3815747 (1974-06-01), Clack et al.
patent: 4237538 (1980-12-01), Le Dall
Portasoft of Maryland, "NS Series Water Treatment Systems", brochure (1 page).
Cintins Ivars
Hydroflo, Inc.
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