Bioremediation of selenite in oil refinery wastewater
Bioremediation of selenite in oil refinery wastewater
复制标题
炼油废水中亚硒酸盐的生物修复
DOI：
--
复制
发表时间：
1995
影响因子：
5
通讯作者：
J. Macy
中科院分区：
文献类型：
--
作者：
S. Lawson;J. Macy
含硒氧阴离子废水的亚硒酸盐含量高达 3690 μg Se/l，且硒酸盐含量非常低，在接种有硒酸盐呼吸细菌 Thauera selenatis 的实验室规模生物反应器系统中进行处理。废水中含有亚硒酸盐，已通过铁共沉淀从炼油厂废水中去除，然后释放亚硒酸盐，产生浓度更高的含硒废水。反应器系统由回收污泥层（500 毫升；200 克沙子）和流化床反应器（500 毫升；150 克沙子）组成。通过反应器系统的流速为3.5ml/min。送入反应器的碳源为乙酸盐(3 mM)；还存在硝酸盐 (3 mM)。废水中的硒氧阴离子含量降低了 95%。 T. selenatis 是反应器系统中检测到的唯一一种硒酸还原细菌，它可能将水中存在的部分硒酸还原为亚硒酸盐。水中存在的亚硒酸盐以及由硒酸盐还原形成的亚硒酸盐被Thauera 和反应器系统中大量存在的反硝化细菌群所还原。
Selenium-oxyanion-containing wastewater, with levels of selenite as high as 3690 μg Se/l and very low levels of selenate, was treated in a laboratory-scale biological reactor system inoculated with the selenate-respiring bacterium Thauera selenatis. The wastewater contained selenite that had been removed from refinery effluent wastewater using iron-coprecipitation followed by selenite release to yield a more concentrated selenium-containing wastewater. The reactor system consisted of recycling sludge-blanket (500 ml; 200 g sand) and fluidized-bed reactors (500 ml; 150 g sand). The flow rate through the reactor system was 3.5 ml/min. The carbon source fed into the reactor was acetate (3 mM); nitrate was also present (3 mM). The selenium oxyanion levels in the wastewater were reduced by 95%. T. selenatis was the only selenate-reducing bacterium detected in the reactor system and it presumably reduced a portion of the selenate present in the water to selenite. The selenite present in the water, and that formed by selenate reduction, was reduced both by the Thauera and by a population of denitrifying bacteria also present in high numbers in the reactor system.