Record Display for the EPA National Library Catalog


Main Title Demonstration of Zinc Cyanide Recovery Using Reverse Osmosis and Evaporation.
Author McNulty, Kenneth J. ; Kubarewicz, John W. ;
CORP Author American Electroplaters' Society, Inc., Winter Park, FL.;Industrial Environmental Research Lab., Cincinnati, OH.
Year Published 1981
Report Number EPA-R-805300; EPA-600/2-81-132;
Stock Number PB81-231243
Additional Subjects Water pollution control ; Electroplating ; Materials recovery ; Zinc inorganic compounds ; Evaporation ; Field tests ; Performance evaluation ; Design criteria ; Process charting ; Technology ; Recirculation ; Cost analysis ; Capitalized costs ; Zinc cyanide ; Waste recycling ; Reverse osmosis ; Heavy metals
Library Call Number Additional Info Location Last
NTIS  PB81-231243 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 43p
A field test was conducted to demonstrate closed-loop recovery of zinc cyanide at a job plating facility. Since the zinc cyanide bath operates at room temperature with very little evaporation from the bath, reverse osmosis (RO) treatment of the rinsewater must be supplemented by evaporation in order to achieve the volume reduction necessary for return of a concentrate to the plating bath. The permeate from the RO unit was recycled to the first rinse after plating while the distillate from the evaporator was recycled to the second rinse after plating. Continuous, unattended operation of this system was demonstrated with no adverse effects on plating quality. The economics of the combined RO evaporation system were assessed for a system designed to provide rinsing equivalent to the present two-stage counter-current rinse at the demonstration site. The analysis showed that the total operating cost (including amortization) was somewhat less for the combined RO evaporation system than the evaporation alone. The minimum cost occurred for 90% water recovery in the RO system. However, credits for rinsewater recovery were insufficient to completely off-set the total operating cost of the recovery system.