Use of Experimental Factorial Design for Optimization of Hexavalent Chromium Removal by a Bacterial Consortium: Soil Microcosm Bioremediation
| Autor: | Wifak Bahafid, Hanane Sayel, Nezha Tahri Joutey, Faouzi Errachidi, Hajar Maâtaoui, Naïma El Ghachtouli |
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| Rok vydání: | 2015 |
| Předmět: |
Bioaugmentation
Chromate conversion coating Chemistry Health Toxicology and Mutagenesis Soil Science chemistry.chemical_element Factorial experiment Contamination Pollution Chromium chemistry.chemical_compound Bioremediation Environmental chemistry Environmental Chemistry Hexavalent chromium Microcosm |
| Zdroj: | Soil and Sediment Contamination: An International Journal. 24:129-142 |
| ISSN: | 1549-7887 1532-0383 |
| DOI: | 10.1080/15320383.2014.922931 |
| Popis: | Hexavalent chromium Cr(VI) is regularly introduced into the environment through diverse anthropogenic activities. It is highly toxic, mutagenic and carcinogenic, and because of its solubility in water, chromate contamination can be difficult to contain. Bacteria can reduce chromate to insoluble and less toxic trivalent chromium Cr(III), and thus increasing attention is paid to chromate bioremediation to reduce its ecotoxicological impacts. In this study, the factorial design 23 was employed to optimize critical parameters responsible for higher Cr(VI) removal by a bacterial consortium. The factors considered were pH, temperature, and inoculum size at two markedly different levels. All three dependent variables have significant effect on Cr(VI) reduction. Optimal Cr(VI) removal by the bacterial consortium occurred at pH 9, temperature 37°C, and inoculum size OD = 3. Analysis of variance (ANOVA) showed a high coefficient of determination (R2) value of 0.984, thus ensuring a satisfactory adjustment of the se... |
| Databáze: | OpenAIRE |
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