Effective bioleaching of chromium in tannery sludge with an enriched sulfur-oxidizing bacterial community
| Autor: | Yue-Qin Tang, Zhao-Yong Sun, Jing Zeng, Guo-Ying Li, Kenji Kida, Min Gou |
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| Rok vydání: | 2016 |
| Předmět: |
Chromium
inorganic chemicals Environmental Engineering 0211 other engineering and technologies Heterotroph Industrial Waste chemistry.chemical_element Bioengineering 02 engineering and technology 010501 environmental sciences 01 natural sciences Acidithiobacillus thiooxidans Bioleaching otorhinolaryngologic diseases Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Waste management biology Renewable Energy Sustainability and the Environment technology industry and agriculture Tanning General Medicine biology.organism_classification Sulfur Biodegradation Environmental Activated sludge chemistry Environmental chemistry Sewage treatment Leaching (metallurgy) Oxidation-Reduction |
| Zdroj: | Bioresource Technology. 218:859-866 |
| ISSN: | 0960-8524 |
| Popis: | In this study, a sulfur-oxidizing community was enriched from activated sludge generated in tannery wastewater treatment plants. Bioleaching of tannery sludge containing 0.9–1.2% chromium was investigated to evaluate the effectiveness of the enriched community, the effect of chromium binding forms on bioleaching efficiency, and the dominant microbes contributing to chromium bioleaching. Sludge samples inoculated with the enriched community presented 79.9–96.8% of chromium leaching efficiencies, much higher than those without the enriched community. High bioleaching efficiencies of over 95% were achieved for chromium in reducible fraction, while 60.9–97.9% were observed for chromium in oxidizable and residual fractions. Acidithiobacillus thiooxidans, the predominant bacteria in the enriched community, played an important role in bioleaching, whereas some indigenous heterotrophic species in sludge might have had a supporting role. The results indicated that A. thiooxidans-dominant enriched microbial community had high chromium bioleaching efficiency, and chromium binding forms affected the bioleaching performance. |
| Databáze: | OpenAIRE |
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