Department of Microbiology, Pusan National University, Busan, 46241, Republic of Korea.
Korea Basic Science Institute, Busan Center, Busan, 46742, Republic of Korea.
Environ Pollut. 2021 Jul 1;280:117001. doi: 10.1016/j.envpol.2021.117001. Epub 2021 Mar 22.
Microbial selenite reduction has increasingly attracted attention from the scientific community because it allows the separation of toxic Se from waste sources with the concurrent recovery of Se nanoparticles, a multifunctional material in nanotechnology industries. In this study, four selenite-reducing bacteria, isolated from a river water sample, were found to reduce selenite by > 85% within 3 d of incubation, at ambient temperature. Among them, strain NDSe-7, belonging to genus Lysinibacillus, can reduce selenite and produce Se nanospheres in alkaline conditions, up to pH 10.0, and in salinity of up to 7.0%. This strain can reduce 80 mg/L of selenite to elemental Se within 24 h at pH 6.0-8.0, at a temperature of 30-40 °C, and salinity of 0.1-3.5%. Strain NDSe-7 exhibited potential for use in Se removal and recovery from industrial saline wastewater with high alkalinity. This study indicates that extremophilic microorganisms for environmental remediation can be found in a conventional environment.
微生物亚硒酸盐还原已引起科学界越来越多的关注，因为它可以将有毒硒从废物源中分离出来，同时回收硒纳米颗粒，这是纳米技术产业中一种多功能材料。在这项研究中，从河流水样中分离出的四种亚硒酸盐还原菌在环境温度下培养 3 天内可将亚硒酸盐还原>85%。其中，属于Lysinibacillus 属的 NDSe-7 菌株可以在碱性条件下（pH 值高达 10.0）和盐度高达 7.0%的条件下还原亚硒酸盐并产生硒纳米球。该菌株可以在 pH 值为 6.0-8.0、温度为 30-40°C 和盐度为 0.1-3.5%的条件下，在 24 小时内将 80mg/L 的亚硒酸盐还原为元素硒。NDSe-7 菌株具有从高碱性工业盐废水中去除和回收硒的潜力。本研究表明，在常规环境中可以找到用于环境修复的极端微生物。
