Optimizacija plazme u reaktoru sa dielektričnim barijernim pražnjenjem

Abstract

Ispitan je uticaj radnog gasa, frekvencije i napona električne struje na generisanje reaktivnih vrsta u koaksijalnom reaktoru sa dielektričnim barijernim pražnjenjem (DBD-reaktor). Plazma u ovom DBD-reaktoru je u kontaktu sa padajućim vodenim filmom i primenjivana je za degradaciju teško razgradivih organskih jedinjenja u vodi. Svojstva plazme su okarakterisana merenjem sadržaja vodonik-peroksida, kao i praćenjem promene temperature, provodljivosti i pH. U pogledu navedenih kriterijuma, najbolja kombinacija je plazma koja se generiše u argonu na 300 Hz i 14 kV u poređenju sa vazduhom (300 Hz; 14 kV i 17 kV) i smešom argona i kiseonika (8:2 VV; 300 Hz 12 kV). Za izabrani slučaj Ar; 300 Hz; 14 kV u poslednjem prolazu vode kroz DBD-reaktor koncentracija H2O2 iznosi 39,36 mgdm-3, pH 4,15, provodljivost je 12 µScm-1, a temperatura 32,0 °C. Na osnovu dobijenih rezultata može se zaključiti da je tretman vode DBD-reaktorom visoko efikasan i da se performanse plazme mogu podešavati menjanjem sastava radnog gasa i električnih parametara.

The influence of working gas, frequency and voltage of electric current on the generation of reactive species in a dielectric barrier discharge coil reactor (DBD reactor) was examined. The plasma in this DBD reactor is in contact with the falling aqueous film and it is used to degrade heavily degradable organic compounds in water. Plasma properties are characterized by measuring the content of hydrogen peroxide, as well as monitoring the temperature, conductivity and pH. In terms of the above criteria, the best combination is plasma generated in argon at 300 Hz and 14 kV in comparison to air (300 Hz, 14 kV and 17 kV) and to argon and oxygen mixture (8: 2 VV; 300 Hz 12 kV). For the selected case Ar; 300 Hz; 14 kV in the last water pass through the DBD reactor, the H2O2 concentration is 39.36 mg / dm3, pH 4.15, the conductivity is 12 μScm-1 and the temperature is 32.0 ° C. Based on the results obtained, it can be concluded that water treatment with the DBD reactor is highly efficient and that plasma performance can be adjusted by changing the composition of working gas and electrical parameters.