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Review on hydrodynamic cavitation degradation of organic wastewater |
WANG Xiuli, ZHAO Guohui, XU Wei, ZHAO Yuanyuan, ZHAO Fujian |
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Hydrodynamic cavitation degradation technology is a promising organic wastewater treatment technology. In this paper, the research progress in theoretical research and the practical application of hydrodynamic cavitation degradation by domestic and foreign scholars in recent years is reviewed and the future research directions are prospected. Firstly, the theoretical research and progress of hydrodynamic cavitation degradation is introduced, and the causes of cavitation formation, and cavitation effects, influencing factors of cavitation collapse and the mechanism of hydrodynamic cavitation degradation are summarized and reviewed. The mechanism of hydrodynamic cavitation degradation can be divided into ″water phase combustion″ reaction mechanism, free radical reaction, and mechanical action. The essence of hydrodynamic cavitation degradation is to use the hydrodynamic cavitation effect to treat organic wastewater. Cavitation collapse is also the cause of the cavitation effect. Secondly, the actual application of hydrodynamic cavitation degradation is introduced from two aspects the hydrodynamic cavitation device and the hydrodynamic cavitation degradation process. Regarding hydrodynamic cavitation devices, the Venturi tube and orifice plate are the most common. In terms of the degradation process, hydrodynamic cavitation degradation, the combined process of hydrodynamic cavitation degradation, and the chemical agents and catalysts. The combined process of hydrodynamics, acoustic cavitation, and various integrated processes have sound effects on organic wastewater, but they are not universally applicable. Finally, the problems existing in the current research are discussed to provide a reference for further practical use of hydrodynamic cavitation technology, and the future of cavitation degradation technology is prospected.
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Received: 08 August 2021
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