Evaluation of a pilot scale high pressure plasma ozonizer for use in wastewater treatment

Abstract

The plasma technique which is used for wastewater treatment is one of the most effective processes for ozone production. In this study, a laboratory scale plasma technique ozonizer designed for treating wastewater was tested under various operation conditions which included voltage (E), current frequency (f), electrical current (I), gas pressure in the system (P), distance of electric dipoles (d), type of electric pole and energy consumption. The optimum configuration for the highest ozone production efficiency was observed using a needle shape electrode when voltage (E) was set at 18,000 volts, f at 1,000 Hz, I at 35 mA, P at 1.3x10⁵ N/rn² and d at 0.003 m. Using the configuration, the ozonizer efficiency was tested in treatment of domestic and shrimp farm wastewater. Results showed that the ozonizer can significantly improve the quality of wastewater within 60 min of treatment.

Key words: Ozone, ozonizer, oxidizer, plasma, high pressure, plasma system.