1 九州国際大学地学Division of Earth Science, Kyushu International University ◇ 〒805-8512 福岡県北九州市八幡東区平野1-6-1
2 近畿大学大学院産業技術研究科Graduate School of Industrial Technical Research, Kinki University
3 近畿大学九州工学部Faculty of Engineering at Kyushu, Kinki University
本研究では，実験室規模の好気性雰囲気循環装置において，工業的に利用されているモルデナイトやクリノプチロライトを主な鉱物とした天然ゼオライト岩7種類を用いて，河川水に含まれる窒素成分の硝化および除去する方法の基礎的知見として，これら天然ゼオライト資源の諸物性と硝化および脱窒素能力について研究を行った。一般に，天然ゼオライト岩の水質浄化能力は，同一実験条件下で試験水のpH，COD，NH4+，NO2−，NO3−，T–N等を測定し，対照試料としてイオン交換能を持たない竹炭及び全く吸着能を持たないガラスビーズの場合の結果と比較し，それらの諸物性と照らし合わせて評価した。
これらを様々な組み合わせで実験を行った結果，天然ゼオライトが高い陽イオン交換能をもつ事から，イオン交換能を持たない竹炭や，吸着能及び交換能を全く持たないガラスよりもNH4+の硝化によるアンモニア除去と脱窒素に有利であることが明らかになった。また，天然ゼオライト資源の水質浄化能力は，各イオン交換能が重要な役割を果たし，陽イオン交換能が高い天然ゼオライト岩ほど高い水質浄化能力を示すことが明らかになった。
We inquired per removal capability with many physical properties of natural zeolite as fundamental knowledge of the method of removing the nitrogen ingredient contained in river water. In this research, it inquired per removal capability with many physical properties of these natural zeolite resources in the aerobic atmosphere circulation equipment of a laboratory scale using seven kinds of natural zeolite rocks which used Mordenite and Clinoptilolite as the main mineral as fundamental knowledge of the method of removing the nitrogen ingredient contained in river water. We measured pH, COD, NH4+, NO2−, NO3− and T–N, etc. of examination water under the same experiment conditions. We have also compared purification ability of the water quality in natural zeolite with BBC without ion exchange ability, and Glass which does not have adsorption ability at all. Moreover, the water quality purification capability of natural zeolite was evaluated also including many of those properties.
We showed clearly that natural zeolite was more advantageous to the removal of ammonium ion by oxidization of NH4+ and the removal of nitrogen than BBC without ion exchange ability, and Glass which does not have adsorption ability and exchange ability at all, when natural zeolite had high positive ion exchange ability as the result of various experiments. We showed clearly that the water quality purification capability of natural zeolite resources is excellent as it with high ion exchange ability.
Key words: water quality purification; natural zeolite; ion exchange; ammonium ion; organic nitrogen
© 2003 ゼオライト学会© 2003 Japan Association of Zeolite
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