Pilot Plant Demonstration of a Sulfide Precipitation Process for Metal-Finishing Wastewater Treatment.
ARMY BELVOIR RESEARCH AND DEVELOPMENT CENTER FORT BELVOIR VA
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This report describes a program to evaluate a metal-finishing wastewater treatment process based on the use of a soluble sulfide for metals removal. The process of effectiveness was fully demonstrated through the operation of a system, designed to treat 18,000 gald of mixed-metal bearing wastewater, installed at the Tobyhanna Army Depot TOAD, Tobyhanna, Pennsylvania, where extensive electroplating and other metal-finishing operations are carried out by the Army. The treatment process provides for cyanide destruction by alkaline chlorination, hexavalent chromium reduction by metabisulfite treatment, and metals-removal by the addition of sodium sulfide, ferrous sulfate, and an anionic polymer flocculant aid. The sludge produced is thickened in a gravity sludge thickener and dewatered in a filter press. This report describes the unit processes and equipment used in the system and presents analytical, operating, and cost data obtained during an 11-month operating period.
- Water Pollution and Control