Abstract

WANG, Y.. Removal of arsenic and metal ions from acidic effluents via the Fenton reaction method. J. S. Afr. Inst. Min. Metall. [online]. 2023, vol.123, n.8, pp.415-421. ISSN 2411-9717.  https://doi.org/10.17159/2411-9717/1863/2023.

Arsenic-bearing acidic effluent from hydrometallurgical processes contains many harmful metal ions and must be appropriately treated before discharge. In the present study, arsenic, copper, zinc, aluminum, and magnesium were co-precipitated by means of the Fenton reaction. The precipitates obtained under different conditions were investigated to determine their stability. The results indicate that pH value and hydrogen peroxide (H₂O₂) dosage have significant effects on the removal of various elements. Arsenic, copper, zinc, and aluminum (but not magnesium) can be removed at pH 5-6 and anH₂O₂/As mole ratio of 2 at ambient temperature. The precipitates were mainly amorphous and granular with particle size in the micrometre range. The arsenic concentration in leachate from the toxicity characteristic leaching test was 3.6 mg/L, which proves that the precipitates are effective in fixing arsenic.

Keywords : acidic effluent; arsenic; coprecipitation; Fenton reaction; metal ions.

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