Experimental Study On Degradation Of Refractory Pollutants By Hydrodynamic Cavitation Due To Square Orifices Plates

Hydrodynamic cavitation is a new technology in water treatment in recent years. It is not only energy saving but also high efficiency. What’s more,it also avoids secondary pollution.In this article, the treatment effect and the effect of different experimental conditions on the degradation of refractory wastewater were studied by the square orifices plate hydrodynamic cavitation device which was designed in the Hydraulics Laboratory of Zhejiang University of Technology. At first, we investigate the influence on the degradation of wastewater of p-nitrophenol by the square orifices plate hydrodynamic cavitation device. The result shows that the cycle time, numbers of orifice, size of orifice, initial concentration and water temperature have effect on the degradation of pollutants. Then, we used the solution of methylene blue as the medium to seek for the production of ?OH radicals due to hydrodynamic cavitation by using a spectrophotometer of 760 CRT. And the instrument of YE6263 was used to monitor the pressure of the downstream of the orifices plate in different conditions. Finally, to verify the results, degradation on the chemical industrial organic wastewater was studied by the square orifices plate hydrodynamic cavitation device. We explored the influences of the cycle time, numbers of orifice, size of orifice, initial concentration and pH value, and found out the best hydraulic condition of the orifices plate in processing chemical industrial organic wastewater. This study results could provide a reference for a design of multiple-orifice plate, and laid a foundation for the development and utilization of the cavitation.