Microbial selenium sulfide reduction for selenium recovery from wastewater
| Autor: | Alfons J. M. Stams, R.D. van der Weijden, Simon P.W. Hageman, P. Van Cappellen, Cees J.N. Buisman |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Environmental Engineering Sulfide Health Toxicology and Mutagenesis Inorganic chemistry chemistry.chemical_element Selenium removal and recovery 010501 environmental sciences Wastewater 01 natural sciences Selenate Microbiology Selenium 03 medical and health sciences chemistry.chemical_compound Selenium Sulfide Selenium sulfide Microbiologie Biocrystallization Environmental Chemistry Selenium Compounds Waste Management and Disposal Effluent 0105 earth and related environmental sciences chemistry.chemical_classification WIMEK Microbial reduction Pollution Sulfur 030104 developmental biology chemistry Environmental Technology Sewage treatment Milieutechnologie |
| Zdroj: | Journal of Hazardous Materials 329 (2017) Journal of Hazardous Materials, 329, 110-119 |
| ISSN: | 0304-3894 |
| Popis: | Microbial reduction of selenium sulfide (SeS2) is a key step in a new treatment process to recover selenium from selenate and selenite streams. In this process, selenate is first reduced to selenite, and subsequently selenite is reduced by sulfide and precipitates from the solution as SeS2. The latter is bio-reduced to elemental selenium and sulfide. Two anaerobic granular sludges (Eerbeek and Emmtec) were tested for their efficiency to reduce commercial crystalline SeS2. Emmtec sludge had the highest reducing capacity with commercial SeS2 and was therefore also used for the bioreduction of laboratory synthesized amorphous SeS2. Synthesized SeS2 was formed mixing a sulfide solution and effluent containing selenite. With both SeS2 solids (commercial and synthesized SeS2), Emmtec sludge produced sulfide and a solid consisting of hexagonal elemental selenium. The crystalline hexagonal structure suggests the absence of biomolecules, which stabilize amorphous selenium bio-particles under comparable process conditions (T = 30 °C and a pH between 6 and 7). Selenium particles were not attached to the biomass, suggesting an extracellular formation. The results support the feasibility of the bio-reduction process using sulfur for recovering selenium from water. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect