1. Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan, Research Institute for Advanced Science and Technology, Osaka Prefecture University, 1-2 Gakuen-cho, Sakai, Osaka 599-8570, Japan, Hitachi, Ltd. Higashi-Koigakubo 1-280, Kokubunji-shi, Tokyo, 185-8601, Japan, Water Quality Inspection and Control Section, Osaka Prefectural Water Quality Control Center, 7-2, Murano-Takamidai, Hirakata, Osaka, 573-0014 Japan, The Water Works Service Foundation of Osaka...