The potential of a hybrid process incorporating sulfur-based bioleaching and sulfide-based precipitation for treatment of metal-contaminated soil was examined in batch-type experiments. The sulfur-based soil bioleaching process with Acidithiobacillus sp. could be initiated at a wide range of initial pH from 4.0 to 6.3. After 15 days, 98% of Zn, 89% of Cu and 79% of Cd was bioleached. The gaseous sulfides recycling from Desulfovibrio sp.-mediated sulfate-reducing reactor via N₂ sparging efficiently treated metal-loaded soil leachate. With a sulfide/metal ratio of 3.0, 88% of Zn, 100% of Cu and 95% of Cd were precipitated, resulting in effluent metal concentrations of 3.5 mg Zn²⁺/L, 0.2 mg Cu²⁺/L and 0.03 mg Cd²⁺/L. Copyright © 2013 Taylor & Francis Group, an informa business.
CitationFang, D., Liu, X., Zhang, R., Deng, W., & Zhou, L. (2013). Removal of contaminating metals from soil by sulfur-based bioleaching and biogenic sulfide-based precipitation. Geomicrobiology Journal, 30(6), 473-478.
- Metal contaminant
- Soil leachate
- Sulfide precipitation
- Sulfur bioleaching