Accession Number : ADA143359


Title :   Pilot Plant Demonstration of a Sulfide Precipitation Process for Metal-Finishing Wastewater Treatment.


Descriptive Note : Final rept.,


Corporate Author : ARMY BELVOIR RESEARCH AND DEVELOPMENT CENTER FORT BELVOIR VA


Personal Author(s) : Pressman,M


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a143359.pdf


Report Date : May 1984


Pagination or Media Count : 64


Abstract : 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 gal/d 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.


Descriptors :   *WASTE WATER , *WATER TREATMENT , *CHEMICAL PRECIPITATION , *SULFIDES , WASTE DISPOSAL , POLLUTION ABATEMENT , CHLORINATION , SLUDGE , PILOT PLANTS , WASTES(INDUSTRIAL) , ELECTROPLATING , METALWORKING , FLOCCULANTS , SULFITES


Subject Categories : Water Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE