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首页> 外文期刊>Bioprocess and Biosystems Engineering >The effects of hydraulic retention time (HRT) on chromium(VI) reduction using autotrophic cultivation of Chlorella vulgaris
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The effects of hydraulic retention time (HRT) on chromium(VI) reduction using autotrophic cultivation of Chlorella vulgaris

机译:自养小球藻水力停留时间(HRT)对铬(VI)还原的影响

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摘要

Chromium is an acutely toxic heavy metal that is known to be a carcinogen. Of the two predominant forms of chromium, Cr(III) and Cr(VI), Cr(III) has only about one thousandth the toxicity of Cr(VI). Using microalgal biomass is one way to remove Cr(VI) from the environment. Four days of hydraulic retention time (HRT) was required to completely reduce 10 mg/L of Cr(VI) in the influent. Microalgal biomass is conventionally regarded as an adsorbent in most Cr(VI) reduction studies. However, this study found that Chlorella vulgaris had the potential to convert Cr(VI) to Cr(III) through the enzymatic route of chromium reductase although the measured chromium reductase activity of C. vulgaris was less than that reported values obtained in bacteria. X-ray absorption near-edge spectroscopy (XANES) analysis further showed the absorption edge of Cr(III) in Cr(VI)-treated C. vulgaris, supporting the assumption of Cr(VI) potentially being converted to less-toxic Cr(III).
机译:铬是剧毒的重金属,已知是致癌物。在铬的两种主要形式中,Cr(III)和Cr(VI)中,Cr(III)仅具有Cr(VI)毒性的约千分之一。使用微藻生物质是从环境中去除六价铬的一种方法。需要四天的水力停留时间(HRT)才能完全减少进水中的Cr(VI)10 mg / L。在大多数Cr(VI)还原研究中,微藻生物质通常被视为吸附剂。但是,这项研究发现,尽管测得的寻常小球藻的铬还原酶活性低于细菌报道的值,但小球藻有可能通过铬还原酶的酶促途径将Cr(VI)转化为Cr(III)。 X射线吸收近边缘光谱(XANES)分析进一步显示了Cr(VI)处理的寻常梭菌中Cr(III)的吸收边缘,支持了Cr(VI)可能转化为毒性较低的Cr( III)。

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