Abstract
To prevent silica scale formation on solid surfaces in geothermal water, the changes in silica concentration by ultrasonication were examined. The polymerization rate of monosilicic acid was enhanced by ultrasonication at 500 kHz and was maximum at pH = 8.5. This is because hydroxyl radicals accelerate the reaction between monosilicic and polysilicic acids. Large polymer particles were formed by ultrasonication at 500 kHz. The formation ratio of large particles increased with ultrasonic power and was maximum at pH = 6.0. These results indicate the possibility of the reduction in monosilicic concentration before silica scale formation.
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