Effect of Gas Flow Rate on the Solubility and Lifetime of Liquid-Rotated Aerator Generated-Microbubbles

Abstract

Ozone was adopted to be an alternative technology for the elimination of various kinds of micropollutants. However, ozonation is still limited by poor ozone dissolution in water. Microbubble technology was proposed to overcome this limitation. This paper was aimed to investigate the effect of inlet gas flow rate on the production and solubility of ozone in the liquid phase. A double dielectric barrier discharge (DDBD) -based ozone generator was used and connected to a microbubble aerator. Ozone concentration was measured both in outlet points and in water under various inlet gas flow rates. In addition, the lifetime of best-ozonated micro-bubbles (OMB) was investigated by storing them at two different temperatures. The application of a lower inlet gas flow rate increased ozone concentration, which can increase the mass of ozone input in the water resulted in better ozone solubility. Furthermore, the size of generated bubbles was known to be finer as the decrease of inlet gas flow rates. Lastly, we got that OMB water stored at lower temperatures resulted in longer retention time than the warmer one.

Keywords: Ozone, gas flow rate, solubility, ozone lifetime, microbubble

DOI: 10.7176/APTA/85-02

Publication date: November 30^th 2021