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Bound Liquid Ion Exchange Membranes for Recovery of Chromium from Wastewater.
Nichols-LD; Obermayer-AS; Allen-MB
NTIS: PB 82-250580 :35 pages
The objective of this program was to investigate the feasibility of bound-liquid ion-exchange membrane systems for removal and recovery of chromate from plating rinse waters, thereby conserving an important resource and minimizing harmful chromate effluent levels. Experimental techniques employed liquid-liquid extraction and simple membrane immersion to assess candidate ion-exchange liquids, followed by chromate transport measurements in membrane test cells using simulated chromate rinse solutions. The transport process is chemically driven by passage of some counter-ion in the opposite direction; counter-ions studied included basic chloride, phosphate, and carbonate solutions. Chloride and carbonate are both effective, and the latter is preferable from a chromate-reuse standpoint. Measured transport rates are in a range suitable for practical use, but membrane lifetimes were limited by a phase-inversion process in which water droplets nucleate within the membrane and eventually halt ion exchange. This phase-inversion process, shown by solutions of quaternary amine in ion-exchange reagents in aromatic kerosines whether or not chromate is present, must be prevented to render chromate recovery systems feasible.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 82-250580
Moleculon Research Corp.
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division