Recently, the variety of agricultural chemicals is increasingly making complicity in the status of water environment Gravel-bed oxidation method has been used for improvement of river water quality in Japan. From the viewpoint of the " ZERO EMISSION" concept, applications of plastic media or contact media to the water purification systems have been studied recently. Several studies on removal mechanism of BOD, COD, and SS in these water purification systems are reported, however, the removal

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... hanism of agricultural chemicals has not been clarified yet For main purpose to recycle the usable industry resources in Saga as the contact media, the purification mechanism of agricultural chemicals are investigated both in the batch experiment and the continuous flow experiment. As a result, the contact media have little effect on the reduction rate of agricultural chemicals. It is shown that major factor of removal efficiency of the agricultural chemicals is "n-octanol/water (partition coefficient) ". Also it is clear that the agricultural chemicals absorbed by SS can be removed with SS capture in the contact oxidation method. KEYWORDS; Contact oxidation method, Re-use of solid waste, Agricultural chemical, n-octanol/water (partition coefficient )