Study on anaerobic treatment of wastewater containing hexavalent chromium

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. 作 者： XU Yan-bin    XIAO Hua-hua    SUN Shui-yu   作者單位： Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510090, China  期 刊： 浙江大學學報B（英文版）  SCI   Journal： JOURNAL OF ZHEJIANG UNIVERSITY SCIENCE B  年，卷(期)： 2005, 6(6)  分類號： X703.1  Keywords： Hexavalent chromium    Wastewater    Anaerobic    Bio-filter bed    Hexavalent chromium bio-removal   

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