日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

We have investigated with removal capability with many physical properties of natural mordenite as fundamental knowledge of the method of removing the nitrogen ingredient contained in river water. In this study, we have surveyed removal capability with many phisical properties in the aerobic atmosphere circulation equipment of a laboratory scale and full scale of the artificial biotope using these natural mordenite rocks and bamboo coal. We measured pH, COD, NH₄⁺, NO₂⁻, NO₃⁻ and T-N, etc. of actural river water under the same experiment conditions. We have also compared purification ability of the water quality in natural mordenite and bamboo coal, which is without ion exchange ability, and glass, which does not have adsorption ability at all. Moreover, the water quality purification capability of natural mordenite was also evaluated including many of those properties.

We showed clearly that natural mordenite was more advantageous to the removal of ammonium ion by oxidization of NH₄⁺ and the removal of nitrogen than bamboo coal without ion exchange ability, and glass which does not have adsorption ability and exchange ability at all, when natural mordenite had high positive ion exchange ability as the result of various experiments. We also elucidated that the ability of water quality purification of natural mordenite as a resources is more excellent to bamboo coal even within the artificial biotope.