Generation of dissolved O-3 and OH radicals in water and O-3 gas with a submerged low-temperature dielectric barrier discharge plasma reactor

摘要

Generation of O-3, and OH radicals in,water and, in air, using a low-temperature dielectric barrier plasma reactor was investigated to determine the optimal, operating conditions of the plasma reactor in seawater and freshwater for fisheries. For seawater, increase in,dissolved O-3 concentration,at airflows < 3 l min(-1) was slew, while the rate increased rapidly at air flows >4 l min(-1). For freshwater, O-3 concentration at air flows < 3 l min(-1) increased slightly after 1 min and then remained unchanged. O-3; concentrations were markedly higher at air flows of 5 similar to 7 l min(-1) relative to these at airflows <3 l min(-1), but no further increase occurred after 4 min The dissolved O-3 concentration for 5.00 ppt salinity increased to > 2.5 mg l(-1) for 20 min; while the concentration, with added natural, salt and refined salt increased to 0.6 mg l(-1) at 5 min, and did not increase. further. The maximum concentration of dissolved OH radicals in seawater was observed at air flow rates of 5 similar to 7 l min(-1), and the rate of OH radical production was affected much less by the air flow rate than 0, generation, The formation of OH radicals was similar in freshwater and seawater. 0; cencentration, in air increased more rapidly in freshwater than in seawater. An airflow rate of 3 similar to 4 l min(-1) appeared to be optimal! for Minimizing the generation of 03 gas in air and, maximizing the generation, of OH radicals and 0; for maximum bactericidal effect and water purification.