Water treatment method

Details Water treatment method Water treatment method

1991-03-01

1994-05-10

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

521 26, B01J 4900

Patent

active

053104889

ABSTRACT:
A water treatment apparatus and method for softening "problem water". The apparatus includes a pair of treatment tank assemblies, each tank including serially connected filter and ion exchange beds. When a tank assembly requires regeneration, the tank assembly is taken off line and is regenerated using a regenerating apparatus that communicates a mixture of citric acid and brine solution to the ion exchange bed, followed by brine solution alone to form a barrier. A mixture of sodium carbonate and brine solution is then communicated to the ion exchange bed followed by a backwashing step which conveys treated water through both the ion exchange bed and the filter media in a counter flow direction. The regeneration apparatus includes a brine venturi and a chemical draw venturi connected in a parallel flow relationship and solenoid control valves for selectively communicating either a citric acid reservoir or a sodium carbonate reservoir to the chemical draw venturi. A timer or sequencer sequentially activates the control valves for predetermined time intervals. A heater and insulation is provided for the sodium carbonate reservoir to inhibit precipitation of the sodium carbonate out of solution. The regeneration apparatus also includes a flushing arrangement for flushing a fluid path along which the sodium carbonate solution flows during regeneration.

REFERENCES:
patent: 2769787 (1956-11-01), Diamond
patent: 4071446 (1978-01-01), Kunin
patent: 4083782 (1978-04-01), Kunin
patent: 4116860 (1978-09-01), Kunin
patent: 4693814 (1987-09-01), Brown
patent: 4764280 (1988-08-01), Brown et al.
patent: 4804465 (1989-02-01), Brown

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