Characterization of plasma reactors in plasma activated water production

Najčešće korišteni plazma reaktori za tretman tekućina pulsirajućim visokonaponskim plazma pražnjenjem su korona reaktori. U ovom radu prikazana je njihova karakterizacija te eksperimentalna primjena u tretiranju destilirane vode. Uzorci vode tretirani su u volumenima od 100, 200 i 500 mL u vremenskom trajanju od 10 i 20 minuta pri naponu pražnjenja od 30 kV, a korišteni reaktori bili su u plinskoj i hibridnoj izvedbi. Prije i nakon svakog eksperimenta provedena su mjerenja fizikalno – kemijskih svojstva kako bi se utvrdio utjecaj korona pražnjenja na njihovu promjenu. Mjerena fizikalna svojstva su: temperatura, pH i električna vodljivost. Od nastalih reaktivnih kemijskih vrsta praćena je koncentracija vodikovog peroksida, nitrata i nitrita. Također, određena je i stabilnost H2O2 molekula u plazma aktiviranoj destiliranoj vodi skladištenoj pri različitim uvjetima čuvanja. Rezultati eksperimenta ukazuju na značajnu promjenu svojstava tretiranih uzoraka vode čiji intenzitet promjene ovisi o tipu korištenog reaktora.The most commonly used plasma reactors for liquid treatment with pulsed high voltage discharges are corona reactors. This paper presents characterization of such reactors and experimental application in treatment of distilled water. Water samples were treated in volumes of 100, 200 and 500 mL for 10 and 20 minutes at voltage of 30 kV in reactors designed as gas or hybrid ones. Before and after each experiment, physico – chemical properties were measured to determine the influence of corona discharge on their change. Physical properties that have been monitored were: temperature, pH and electrical conductivity. Of the reactive chemical species formed, the concentration of hydrogen peroxide, nitrates and nitrites were monitored. Also, the stability of H2O2 molecules was determined in the plasma-activated distilled water stored at different conditions. Experimental results indicate a significant change in the properties of treated water samples whose change in intensity depends on the type of used reactor