Decomposition of Organic Compound by Submerged Water Jet with Cavitation

Abstract

Cavitation generated by submerged water jet can decompose and oxidize organic compounds in water. In this paper, we report the development of a new submerged water jet system, which is capable of oxidizing and decomposing organic compounds by cavitating water jet discharged through a specially devised nozzle with discharge presuure of at most 0.6 MPa. The nozzle consists of a converging part and a diverging part, and chemical reactions take place within cavitation bubbles in the diverging part, where cavitation is initiated by a number of micro air bubbles injected upstream. We use an aqueous solution of indigo carmine as a test liquid, and concentration is measured using a colorimeter. The aqueous solution is kept at the temparature of about 40℃ during experiments.