| 硫酸盐还原菌还原U(Ⅵ)的影响因素与机制 |
| 摘要点击 3757 全文点击 1796 投稿时间：2008-08-02 修订日期：2008-11-14 |
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| 中文关键词 SRB 铀 Mo(Ⅵ) Ca2+ 抑制机制 |
| 英文关键词 sulfate-reducing bacteria(SRB) uranium Mo(Ⅵ) Ca2+ inhibitory mechanism |
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| 中文摘要 |
| 在厌氧环境下，改变温度、U(Ⅵ)的初始浓度、pH值、共存离子等因素，进行硫酸盐还原菌（SRB）还原U(Ⅵ)试验，以了解其特性.结果表明，SRB的最佳还原条件为温度35℃、pH值7.0、U(Ⅵ)初始浓度25 mg·L-1.SRB的最大还原能力为179.1 mg·g-1.共存离子Mo(Ⅵ)或Ca2+初始浓度小于或等于5 g·L-1时，对SRB还原U(Ⅵ)影响不大；但当其浓度达到20 g·L－１时，它们对SRB还原U(Ⅵ)均具有很强的抑制作用.Mo(Ⅵ)对SRB的抑制主要是生理抑制，Ca2+是通过和U(Ⅵ)形成稳定的Ca-UO2-CO3络合物竞争抑制.试验结果还表明，Ca2＋浓度低于5 g·L－１时未出现停滞期，但其浓度超过20 g·L－１时出现了1 d的停滞期. |
| 英文摘要 |
| Under anaerobic conditions，the characteristics of sulfate reducing bacteria（SRB） were applied to reduce U(Ⅵ) under different temperature，pH values， U(Ⅵ) concentrations and coexisting ions.The results showed that the optimum reduction condition was the temperature 35℃，pH 7.0 and U(Ⅵ) concentration 25 mg·L－１.The maximum reduction capacity of SRB was 179.1 mg·g-1.Mo(Ⅵ) or Ca2＋ did not affect SRB on the reduction process of U(Ⅵ) under the concentration less than 5 g·L－１，but they strongly inhibited the process under the concentration more than 20 g·L－１.The main inhibition of Mo(Ⅵ) was physiological inhibition and the inhibition of Ca2＋ was competitive inhibition through the stable complex formation，Ca-UO2-CO3. The results also showed that lag phase did not appear on the concentration of Ca2+ less than 5 g·L－１，but the lag phase of 24 hours appeared on the concentration of Ca2+ more than 20 g·L－１. |
