Combined removal of Cr, Cd, and Ni from wastes

Journal Article · Wed Feb 01 00:00:00 EST 1984 · Environ. Prog.; (United States)

DOI:https://doi.org/10.1002/ep.670030105· OSTI ID:5037016

Higgins, T E; Sater, V E

The results are presented of pilot-plant tests on treating electroplating wastes by alkaline reduction, precipitation, and upflow filtration. Experimental evidence shows that hexavalent chromium is stoichiometrically reduced to trivalent chromium and precipitated by the addition of ferrous sulfate at an alkaline pH. The oxidized iron precipitates as ferric hydroxide and aids flocculation of the solids produced in the process. Sodium sulfide used as the sole reducing agent of chromium was shown to be oxidized to elemental sulfur. Upflow filtration was effective in removing the high concentration of solids. The filter was most effective when operating at a loading rate of 3 gpm/ft/sup 2/.

• Research Organization: Arizona State Univ., Tempe
• OSTI ID: 5037016
• Journal Information: Environ. Prog.; (United States), Vol. 3:1
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
CADMIUM
REMOVAL
CHROMIUM
NICKEL
WASTE WATER
WASTE PROCESSING
ELECTROPLATING
FILTRATION
INDUSTRIAL PLANTS
PILOT PLANTS
REDUCTION
SEPARATION PROCESSES
CHEMICAL REACTIONS
DEPOSITION
ELECTRODEPOSITION
ELECTROLYSIS
ELEMENTS
FUNCTIONAL MODELS
HYDROGEN COMPOUNDS
LIQUID WASTES
LYSIS
MANAGEMENT
METALS
OXYGEN COMPOUNDS
PLATING
PROCESSING
SURFACE COATING
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTES
WATER
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400105 - Separation Procedures
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)