期刊论文

中文

环境科学

0250-3301

2009

30

7

1962-1967

10.3321/j.issn:0250-3301.2009.07.015

10775065:国家自然科学基金 10475038:国家自然科学基金

本校为第一机构

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179.1mg·g~(-1).共存离子M0(Ⅵ)或Ca~(2+)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,Ca~(2+)是通过和U(Ⅵ)形成稳定的Ca-UO_2-CO_3络合物竞争抑制.试验结果还表明,Ca~(2+)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...

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 degrees C, pH 7.0 and U(VI) concentration 25 mg x L(-1). The maximum reduction capacity of SRB was 179.1 mg x g(-1). Mo(VI) or Ca2+ did not affect SRB on the reduction process of U(VI) under the concentration less than 5 g x L(-1), but they strongly inhibited the process under the concentration more than 20 g x L(-1). The mai...