Soda Satoshi, Ma Wenbo, Kuroda Masashi, Nishikawa Hiroshi, Zhang Yuanyuan, Ike Michihiko
a Graduate School of Engineering , Osaka University , Osaka , Japan.
b College of Science and Technology , Ritsumeikan University , Shiga , Japan.
Biosci Biotechnol Biochem. 2018 Jan;82(1):173-181. doi: 10.1080/09168451.2017.1406794. Epub 2017 Dec 4.
Moderately halotolerant selenate- and tellurite-reducing bacteria were characterized for wastewater treatment applications. A selenate-reducing strain 9a was isolated from the biofilm of a leachate treatment plant at a sea-based waste disposal site. A tellurite-reducing strain Taa was isolated from an enrichment culture derived from brackish sediment. Both bacterial strains were Shewanella species. Strain 9a could anaerobically remove 45-70% of 1.0 mM selenate and selenite from water containing up to 3% NaCl within 4 days, while strain Taa could anaerobically and aerobically remove 70-90% of 0.4 mM tellurite from water containing up to 6% NaCl within 3 days. Globular particles of insoluble selenium were observed both outside and inside the cells of strain 9a. The insoluble tellurium formed by strain Taa was globular under microaerobic conditions but nanorod under aerobic conditions. These bacteria will yield a range of useful selenium and tellurium nanomaterials as well as wastewater treatment applications.
对中度耐盐的硒酸盐和亚碲酸盐还原菌进行了表征，以用于废水处理。从一个海上废物处理场的渗滤液处理厂的生物膜中分离出一株硒酸盐还原菌9a。从咸淡水沉积物富集培养物中分离出一株亚碲酸盐还原菌Taa。这两种菌株均为希瓦氏菌属。菌株9a能在4天内从含高达3%氯化钠的水中厌氧去除1.0 mM硒酸盐和亚硒酸盐的45%-70%，而菌株Taa能在3天内从含高达6%氯化钠的水中厌氧和好氧去除0.4 mM亚碲酸盐的70%-90%。在菌株9a的细胞内外均观察到不溶性硒的球状颗粒。菌株Taa形成的不溶性碲在微需氧条件下为球状，在需氧条件下为纳米棒状。这些细菌将产生一系列有用的硒和碲纳米材料以及废水处理应用。
