Generation of UFB Water by Pressure Dissolution and Stirring

Abstract

In recent years, significant amounts of polymerized waste, which cannot be processed using chemicals, has become problematic. Treatment of such materials with ozone and hydrogen peroxide has been reported; however, the safety of the former as well as the stability of hydrogen peroxide are not optimal. Thus, various challenges exist to improve these approaches. It is noteworthy that these methods primarily rely on the oxidation-reduction reactions involving the hydroxyl radical (OH･). Furthermore, UFB (Ultrafine Bubble) water generates negative ions, and thus, simultaneous interactions with the radical species occur. Importantly, the oxidation-reduction effect of the radical species and negative ions is largely reflected in the nano number density of UFB water. It is crucial to establish a technique, which would result in mass-production of high concentration UFB water. In the current study, we attempted to generate a large volume of stable UFB water using pressure dissolution and a stirring mixer. In 20 min, approximately 867 million UFBs /mL of air UFB water was produced. Moreover, air UFB water of approximately 512 million UFBs /mL resulted in OH radical waveform. Air UFB water of approximately 868 million UFBs /mL was in OH radical waveform, which was stronger than air UFB water of approximately 512 million UFBs /mL. Thus, the intensity of the OH radical appeared to increase with the increase in the nano number density of UFB water.