STUDY ON IMPROVEMENT OF TAMAGAWA ACIDIC WATER USING FLY ASH GRANUTRALIZER

Abstract

 The Tamagawa acidic water originates from the Tamagawa hot springs in eastern Akita Prefecture. Currently, the pH of Lake Tazawa has increased from 4.6 to about 5.8 due to the operation of a neutralization treatment facility. However, it has not recovered to 6.8, and the water environment and ecosystem have not yet recovered. In this study, a neutralizer was prepared using fly ash to improve Tamagawa acidic water and to expand the use of coal ash. Neutralization experiments were conducted to evaluate the effectiveness of the neutralizer by analyzing pH changes, the neutralizer, and treated water. The results showed that the neutralizer did not disintegrate or leach heavy metal ions in the weakly acidic range, suggesting that the neutralizer could be used stably.