Removal of Manganese(II) Ions from Water by Leptothrix discophora with Carbon Fiber
Removal of Manganese(II) Ions from Water by Leptothrix discophora with Carbon Fiber
复制标题
盘丝藻碳纤维去除水中锰(II)离子
DOI：
10.2320/matertrans.43.2773
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发表时间：
2002
影响因子：
1.2
通讯作者：
H. Konno
中科院分区：
文献类型：
--
作者：
K. Sasaki;Mai Endo;K. Kurosawa;H. Konno
为将锰氧化菌应用于废水处理，对ATCC保藏的一株锰氧化菌--盘孢纤丝菌的基本性能进行了测定。此外，还研究了碳纤维对细菌氧化的影响，因为有报道称碳纤维在污水处理过程中加速活性污泥的生长。发现该细菌在含有24 ppm Mn（II）离子的培养基中是有活性的，该浓度比推荐浓度和实际有用水平高约8倍。静态培养时的氧化速率高于振荡培养。这被认为是由于细菌的鞘结构的物理损伤，据报道，这是重要的氧化锰（II）离子。碳纤维没有加速Mn（II）离子的微生物氧化。这部分归因于细菌细胞之间缺乏接触，细菌细胞以薄膜形式漂浮，而碳纤维沉入容器底部。然而，氧化的Mn物种沉淀在碳纤维上，这导致水的透明度的改善。这种效果与活性炭所引起的效果不同，因为碳纤维具有非常低的比表面积并且没有孔结构。在振荡培养条件下，吸附效果比静态培养条件下更明显，说明来源于细菌的有机物在吸附氧化态锰中起着重要作用。
To apply manganese-oxidizing bacteria to waste water treatment, basic performance of the manganese-oxidizing bacterium, Leptothrix discophora, distributed by ATCC was examined. In addition, the effect of carbon fiber on the oxidation by the bacterium was also investigated, since carbon fiber was reported to accelerate the growth of activated sludge during sewage treatment. The bacterium was found to be active in the medium containing 24 ppm Mn(II) ions, the concentration being about 8 times higher than the recommended one and practically useful level. The oxidation rate was higher with the static culture than the shaking culture. This was considered to be due to physical damage to the sheath structure of bacteria which is reported to be important to oxidize Mn(II) ions. The carbon fiber did not accelerate the microbial oxidation of Mn(II) ions. This is partly attributed to the lack of contact between the bacterial cell, which floated as thin membranes, and the carbon fiber sunk in the bottom of vessels. However, oxidized Mn species precipitated on the carbon fiber, which resulted in an improvement of the transparency of water. This effect is different from the one caused by activated carbons, since the carbon fiber has very low specific surface area and no pore structure. The effect was more remarkable in the shaking culture than the static culture, indicating that organic substances originated from the bacterium play an important role in the adsorption of oxidized Mn species.