Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1987-06-22
1989-04-25
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210675, 210677, 210688, 423DIG14, B01J 4900, C02F 142
Patent
active
048245755
ABSTRACT:
A process is described involving the detoxification of waste water containing heavy metals which includes recovering the metals in salable form. The metals are removed from the waste water by contacting the water with an ion exchange resin bed contained in a portable canister until it is determined that the resin is saturated with metal. This determination is made by measuring the appearance of heavy metal salts in the effluent from the canister. Regeneration of the resin and recovery of the metal is accomplished in a location diverse to that where the metal is removed from the waste water by (a) back washing the resin with water into a backwashing receiver (b) forward washing the resin with water (c) forward washing the resin with a regenerating solution (d) forward washing the resin with a regenerating solution (d) collecting the regenerating in a plurality of fractions wherein the first fractions contain the majority of the metal recovered and (e) forward washing the resin with water to remove excess regenerating agent.
REFERENCES:
patent: 3101316 (1963-08-01), Rose
patent: 3658470 (1972-04-01), Zievers et al.
patent: 4001113 (1977-01-01), Schoenrock et al.
patent: 4049548 (1977-09-01), Dickerson
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