| Long-term persistence of turbidity is a major water quality problem in Japan’s reservoirs. We showed that the turbid components of a reservoir could be coagulated by the use of natural coagulant with appropriate treatment methods. A set of settling cylinders was prepared for a coagulation experiment. There were three main findings. The first was that allophane was useful as a coagulant for the treatment of turbid water from reservoirs. Second, distribution of the coagulant by using supersonic waves was indispensable for effective coagulation. Third, the optimum input of coagulant depended on the degree of turbidity of the water if the sampling sight was the same. |
