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Dewatering Electrochemical Machining Sludge.
NTIS: PB 252 001 :9 pages
Electrochemical machining sludge, a troublesome fluid waste product, was dewatered on a bench-scale basis by three alternative methods tested by the federal Bureau of Mines. These methods would enable recycling 89 percent or more of the liquid content of the sludge and allow the dewatered solids to be dumped as landfill or processed further to recover contained nickel. Dewatering by vacuum precoat filtration was estimated to be the least expensive. Based on treating 20,000 gallons per day of sludge, precoat filtration costs were estimated as totaling 1.96 Cents per gallon of sludge. Two options of an alternative method, comprised of acidification, reprecipitation, thickening, and filtration, were estimated to cost either 3.47 Or 3.60 Cents per gallon of sludge.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 252 001
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division