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25mg·L^-1．SRB的最大还原能力为179．1mg·g^-1．共存离子Mo（Ⅵ）或Ca^2＋初始浓度小于或等于5g·L^-1时，对SRB还原U（Ⅵ）影响不大；但当其浓度达到20g·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，Ca^2＋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，Ca^2＋浓度低于5g·L^-1时未出现停滞期，但其浓度超过20g·L^-1时出现了1d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 Ca^2＋ 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 Ca^2＋ 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 Ca^2＋ less than 5 g· L^-1 , but the lag phase of 24 hours appeared on the concentration of Ca^2＋ more than 20 g· L^-1 .