Recovery of chromates by membrane

Details Recovery of chromates by membrane Recovery of chromates by membrane

1974-12-12

1976-10-19

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210321A, B01D 1300

Patent

active

039869504

ABSTRACT:
A dialysis method for selectively removing chromates from cooling tower blow-down streams while retaining calcium and magnesium scaling compounds is provided. Preferential transport of chromates through the walls of hollow fiber assemblies is achieved by control of the chromic acid dissociation equilibrium, through feed and product pH adjustment. In a preferred mode, blowdown waste water is brought into contact with the exterior surface of the fibers while chromate-free make-up water is simultaneously circulated through the fiber bores. The permeating species is collected by the make-up water within the fiber bores for re-use in corrosion inhibition.

REFERENCES:
patent: 3228876 (1966-01-01), Mahon
patent: 3468796 (1969-09-01), Holl et al.
patent: 3607104 (1971-09-01), Blickle et al.
patent: 3625885 (1971-12-01), Geinopolos

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