The Effect of Venturi Tube Divergence Angle Geometry on Wastewater Treatment

Abstract

One of an important environmental issue is water pollution from waste of textile industries. Rhodamine B as one of compounds commonly used as a dye in the textile industries has negative effects on health such as irritation on eyes and skin. Hydrodinamics cavitation as one of Advanced Oxidation Process (AOP) is considered as an effective method for wastewater treatment. Venturi tube is a simple cavitation reactor where its dimensions strongly affect the cavitation phenomena. In this work, we conducted an experiment to investigate the effect of a venturi tube divergence angles on the hydrodynamics cavatation phenomena and its effect on the degradation of rhodamine B in water. The results show that smaller divergence angle causes larger pressure losses of the flow. Consequently, this results in more intensive cavitation as indicated by the longer area of cavitation occured and lower value of the cavitation number. Moreover, the smaller angle results in more effective for pollutant degradation as indicated by the higher value of the cavitation yield.