PRACTICAL APPLICATION OF WATER PURIFICATION METHOD FOR SMALL-SCALE RIVERS WITH MICROORGANISM FIXED BAMBOO CHARCOAL

竹炭的过滤功能和吸附能力都很好，因为竹炭是多孔性的，而且竹炭的比表面积比木炭大。因此，竹炭吸附生活排水和河流中的污垢、恶臭或杂质，以及附着在竹炭上的微生物分解水污染等有机物，有望实现竹炭的净水。本研究提出将鹿儿岛县的地方产业竹炭用于水处理。为此，将生物膜附着在竹炭的孔隙中，并对该附着微生物的基本净化能力进行了检测。此外，还考察了不同条件下的处理效果，以期应用于实际的小规模河流。采用管式和间歇式反应器对模型废水的有机物(COD)处理特性进行了考察。实验结果表明，微生物固定化竹炭可用于净水，在管式反应器的通流操作中，随着停留时间的增加，反应(去除)率增加，萃取率可达70%左右。结果表明，间歇处理过程中，温度对COD的降解率有很大影响。

The filtering function and the adsorption ability force of bamboo charcoal are excellent, because bamboo charcoal is porous and the specific surface of bamboo charcoal is bigger than that of charcoal. Therefore, it is expected that the water purification is possible by bamboo charcoal, since it adsorbs fouling, offensive odor or impurity of daily life drainage and rivers and the organic substances as water pollution are decomposed by the microorganism which is adhered to the bamboo charcoal.Then, in this study, it is proposed that bamboo charcoal which is local industry of Kagoshima Prefecture is used for water treatment. For the purpose, the biofilm was made to adhere in the pore of the bamboo charcoal, and the basic purification capacity of this adhesion microorganism was examined. In addition, the treatment performance under various conditions was examined for the purpose of applying to actual small-scale rivers. The treatment characteristics about organic matter (COD) were examined for the model waste water by using tubular or batch reactor. It was elucidated from these experimental results that water purification is possible with the microorganism fixed bamboo charcoal.In the flow-through operation by the tubular reactor, the reaction (removal) ratio increased when the residence time increased, and the extraction ratio of about 70% was shown. It was clarified that the diminution rate of COD was largely affected by the temperature in the batch processing operation.