Study on anaerobic treatment of wastewater containing hexavalent chromium |
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| Authors: | Xu Yan-bin Xiao Hua-hua Sun Shui-yu |
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| Institution: | Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510090, China. hopeybxu@tom.com |
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| Abstract: | A self-made anaerobic bio-filter bed which was inoculated with special sludge showed high efficiency in removing hexavalent chromium. When pump flow was 47 ml/min and CODCr ofwastewater was about 140 mg/L, it took 4 h to decrease the Cr6 concentrations from about 60 mg/L to under 0.5 mg/L, compared with 14 h without carbon source addition. Cr6 concentrations ranged from 64.66 mg/L to 75.53 mg/L, the system efficiency was excellent. When Cr6 concentration reached 95.47 mg/L,the treatment time was prolonged to 7.5 h. Compared with the contrast system, the system with trace metals showed clear superiority in that the Cr6 removal rate increased by 21.26%. Some analyses also showed that hexavalent chromium could probably be bio-reduced to trivalent chromium, and that as a result, the chrome hydroxide sediment was formed on the surface of microorganisms. |
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| Keywords: | Hexavalent chromium Wastewater Anaerobic Bio-filter bed Hexavalent chromium bio-removal |
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