Abstract
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 mechanismof BOD, COD, and SS inthese water purification systems are reported, however, the removalm echanism of agricultural chemicalsh as 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 A.s a result, the contactm ediah ave littlee ffect 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.
