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Study on anaerobic treatment of wastewater containing hexavalent chromium

  • Environmental Sciences
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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 of wastewater 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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Authors and Affiliations

  1. Faculty of Environmental Science and Engineering, Guangdong University of Technology, 510090, Guangzhou, China

    Xu Yan-bin, Hua-hua Xiao & Shui-yu Sun

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  1. Xu Yan-bin
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  2. Hua-hua Xiao
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  3. Shui-yu Sun
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Correspondence to Xu Yan-bin.

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Project (No. 020099) supported by a Grant from Environmental Protection Bureau of Guangdong Province, China

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Xu, Yb., Xiao, Hh. & Sun, Sy. Study on anaerobic treatment of wastewater containing hexavalent chromium. J Zheijang Univ Sci B 6, 574–579 (2005). https://doi.org/10.1631/jzus.2005.B0574

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  • DOI: https://doi.org/10.1631/jzus.2005.B0574

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