Bioleaching of Heavy Metals from Municipal Solid Waste Incineration Fly Ash: Availability of Recoverable Sulfur Prills and Form Transformation of Heavy Metals
| Autor: | Qiang Hao, Xuefeng Wei, Ruofan Si, Ruichang Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
inorganic chemicals Municipal solid waste PH reduction chemistry.chemical_element recoverable sulfur 02 engineering and technology 010501 environmental sciences 01 natural sciences Bioleaching General Materials Science lcsh:Mining engineering. Metallurgy 0105 earth and related environmental sciences Toxicity characteristic leaching procedure sulfur oxidizing bacteria Metals and Alloys Human decontamination heavy metal 021001 nanoscience & nanotechnology Sulfur fly ash chemistry Fly ash Environmental chemistry bioleaching Leaching (metallurgy) 0210 nano-technology |
| Zdroj: | Metals Volume 10 Issue 6 Metals, Vol 10, Iss 815, p 815 (2020) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met10060815 |
| Popis: | Bioleaching is an effective and promising approach for the recovery or removal of heavy metals from metal-laden municipal solid waste incineration fly ash. To exclude the risk of reacidification of the leached fly ash after bioleaching with sulfur powder, molded sulfur prills were used as energy substrate for sulfur oxidizing bacteria to examine the availability of reusing the recyclable sulfur forms. The chemical species of heavy metals during the bioleaching process were also investigated. Results showed that the pH reduction, sulfate production, and metal solubilization with sulfur prills were comparable to that with sulfur powder despite of the theoretically calculated smaller surface of the formers. After 15 days of bioleaching, 80.7&ndash 82.1% of Cd, 72.5&ndash 74.1% of Zn, 42.8&ndash 43.9% of Cu, 24.1&ndash 25.2% of Cr, and 12.4&ndash 13.0% of Pb were removed from the fly ash, respectively. During bioleaching, heavy metals in the acid extractable and reducible fraction were significantly removed, and metals in oxidizable from were partially reduced. The low leaching toxicity of heavy metals according to toxicity characteristic leaching procedure (TCLP) verified the effective detoxification of fly ash. Moreover, the comparable pH reduction and metal removal efficiencies of bioleaching process with recycled sulfur prills to that with fresh sulfur revealed the potential of reusing the recoverable sulfur prills in the bioleaching process for decontamination of heavy metals from municipal solid waste fly ash. |
| Databáze: | OpenAIRE |
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