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Dielectric Barrier Discharge (DBD) plasma is a new technique for use in environmental pollutant degradation, which is characterized by the production of hydroxyl radicals as the primary degradation species. Due to the sH<sup>o</sup>rt lifetime of the chemically active species generated during the plasma reaction, the dissolution of the plasma gas has a significant effect on the reaction performance. The plasma reaction performance can be enhanced by combining the basic plasma reactor with a H<sup>o</sup>mogenizer system in which the bubbles are destroyed and turned into micro-bubbles. For this purpose, the improvement of the dissolution of plasma gas was evaluated by measuring the RNO (N-dimethyl-4-nitrosoaniline, an indicator of the generation of OH radicals). Experiments were conducted to evaluate the effects of the diameter, rotation speed, and height of the H<sup>o</sup>mogenizer, pore size, and number of the diffuser and the applied voltage on the plasma reaction. The results sH<sup>o</sup>wed that the RNO removal efficiency of the plasma reactor combined with a H<sup>o</sup>mogenizer is two times higher than that of the conventional one. The optimum rotor size and rotation speed of the H<sup>o</sup>mogenizer were 15.1 mm, and 19,700 rpm, respectively. Except for the lowest pore size distribution of 10-16 μm, the pore size of the diffuser sH<sup>o</sup>wed little effect on RNO removal.
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