Removal of arsenic from aqueous solution by adsorbing colloid flotation

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00028a020· OSTI ID:7199625

Peng, F F; Di, P ^[1]

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1. West Virginia Univ., Morgantown, WV (United States). Dept. of Mineral Processing Engineering

Adsorbing colloid flotation (ACF) with ferric hydroxide as the coprecipitant, anionic surfactant sodium dodecyl sulfate (SDS) as the collector, and nitrogen microbubbles has been shown to be effective in removing arsenic from low concentration of arsenic aqueous solution ([approximately]10 mg/dm[sup 3]). Experiments were conducted to assess the effects of pH, dosages of SDS and Fe(III), gas flow rate, foreign anions including NO[sub 3][sup [minus]], SO[sub 4][sup 2[minus]], and PO[sub 4][sup 3[minus]], and Al(III) addition on the efficiency of the arsenic removal by ACF. When pH is at the range of 4--5, 99.5% arsenic removal efficiency can be achieved. The optimal operating conditions are 35 ppm SDS, 80 ppm Fe(III), 40 cm[sup 3]/min gas flow rate, 500 rpm rotary speed of stirrer, and 5 min ferric hydroxide floc formation time. The analysis results indicate that foreign anions SO[sub 4][sup 2[minus]] and PO[sub 4][sup 3[minus]] have an inhibiting effect on the removal of arsenic, while AI(III) additions can compensate for the effect. An actual mine wastewater sample containing 10.4 ppm arsenic(V), 0.76 ppm chromium(VI), and 0.55 ppm lead was tested by adsorbing colloid flotation at the optimal operation conditions. The residual arsenic, chromium, and lead are 0.07, 0.06, and 0.04 ppm, respectively. The interaction mechanisms between Fe(OH)[sub 3]-bearing arsenic floc and SDS were analyzed and interpreted by means of [zeta]-potential, infrared spectra analysis, and molecular orbital theory. The adsorption of SDS can occur physically and chemically on Fe(OH)[sub 3] at the pH range of 4--5.

• OSTI ID: 7199625
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 33:4; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
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Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ALUMINIUM
ARSENIC
CHROMIUM
ELEMENTS
FLOTATION
HYDROGEN COMPOUNDS
INDUSTRY
LEAD
LIQUID WASTES
MANAGEMENT
MATERIALS RECOVERY
METALS
MINERAL INDUSTRY
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PROCESSING
SEMIMETALS
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER TREATMENT