The removal of chromium, nickel, and zinc from electroplating wastewater by adsorbing colloid flotation with a sodium dodecylsulfate/dodecanoic acid mixture

Journal Article · Sun Mar 01 00:00:00 EST 1992 · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399208018887· OSTI ID:5289772

Sanciolo, P; Harding, I H; Mainwaring, D E ^[1]

---

1. Swinburne Inst. of Tech., Hawthorn (Australia)

The removal by adsorbing colloid flotation of Cr(III), Ni(II), and Zn(II) from chromium stream electroplating wastewater was investigated. Adsorbing colloid flotation involves the stripping of contaminants by adsorption or coprecipitation onto added colloidal material and its subsequent flotation by column flotation. The added colloid was prepared in situ by the hydrolysis of added metal (Fe(III))ions. Adsorbing colloid flotation using a single surfactant (SDS) in the batch mode was shown to result in poor results for real industrial samples, presumably due to the chemical complexity of such samples. However, a dual surfactant system (sodium dodecylsulfate (SDS) + dodecanoic acid (DA)) provided encouraging results. By using such a dual surfactant system, chromium stream electroplating wastewater was treated, successfully lowering metal ion contamination levels to below that required for discharge into typical metropolitan drainage systems. Flotation was found to be successful at near neutral pH conditions (7.5) and for several different (electroplating) industrial samples. Adsorbing colloid flotation in the continuous mode was investigated by using the dual surfactant system optimized in batch experiments. At flow rates encouraging to full-scale commercial applications, toxic metal ions (Cr(III), Ni(II), Zn(II)) were stripped from contaminated industrial samples to below the 100 ppm typically required for metropolitan discharge. A two-stage continuous processing scheme was investigated where once-treated effluent was passed through a second polishing column. Use of this two-stage process typically resulted in the stripping of toxic metal ions (from similar samples) to well below the 1 ppm level typically required for environmental discharge.

• OSTI ID: 5289772
• Journal Information: Separation Science and Technology; (United States), Vol. 27:3; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
CHROMIUM
FLOTATION
NICKEL
ZINC
ABSORPTION SPECTROSCOPY
ADSORPTION
CHEMICAL PREPARATION
COLLOIDS
ELECTROPLATING
EXPERIMENTAL DATA
HYDROLYSIS
INDUSTRIAL WASTES
IONIC CONDUCTIVITY
IRON
MATERIALS RECOVERY
OPERATION
PH VALUE
QUANTITY RATIO
SEPARATION EQUIPMENT
SURFACTANTS
WASTE WATER
WATER POLLUTION CONTROL
WATER TREATMENT
CHEMICAL REACTIONS
CONTROL
DATA
DECOMPOSITION
DEPOSITION
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODEPOSITION
ELECTROLYSIS
ELEMENTS
HYDROGEN COMPOUNDS
INFORMATION
LIQUID WASTES
LYSIS
MANAGEMENT
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATING
POLLUTION CONTROL
PROCESSING
SEPARATION PROCESSES
SOLVOLYSIS
SORPTION
SPECTROSCOPY
SURFACE COATING
SYNTHESIS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
WATER
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)