Title :
Electrical Characteristics of Pulsed-Discharge Plasma for Decoloration of Dyes in Water
Author :
Na Lu ; Yingchun Feng ; Jie Li ; Kefeng Shang ; Yan Wu
Author_Institution :
Key Lab. of Ind. Ecology & Environ. Eng., Dalian Univ. of Technol., Dalian, China
Abstract :
The electrical characteristics of pulsed-discharge plasma for decoloration of dyes in water were systematically investigated with a view toward getting insight into discharge process. Methylene blue (MB) dye water was selected as the target object. The discharge behavior was found to depend on the power supply voltage, conductivity of MB solution, and pulse-forming capacity. A strong positive linear relationship existed between power supply voltage and initial capacitor voltage. The injection energy per pulse increased when increasing the power supply voltage and a maximal energy efficiency of injection of approximately 85% was obtained at power supply voltage of 50 V. The conductivity of MB solution had appreciable impact on the voltage-current characteristics and discharge time of pulse-forming capacitor. Remarkable increase of pulse current was observed as the pulse-forming capacity increasing, while it had slight effect on the pulse voltage. The pulsed corona discharge in MB solution could change into spark discharge by way of increasing the air flow rate and reducing the electrode distance. Increasing pulse-forming capacity and pulse frequency significantly accelerated the decoloration rate of MB in solution. This paper is expected to provide reference for improving the application of pulsed-discharge plasma in treating dye solution.
Keywords :
corona; dyes; plasma diagnostics; sparks; air flow rate; discharge time; dye decoloration; electrical characteristics; electrode distance; initial capacitor voltage; injection energy; maximal energy efficiency; methylene blue dye; power supply voltage; pulse current; pulse frequency; pulse voltage; pulse-forming capacitor; pulse-forming capacity; pulsed corona discharge; pulsed-discharge plasma; solution conductivity; spark discharge; voltage 50 V; voltage-current characteristics; Capacitors; Conductivity; Discharges (electric); Electrodes; Plasmas; Power supplies; Dye solution; electrical characteristics; methylene blue (MB) decoloration; pulsed-discharge plasma; pulsed-discharge plasma.;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2015.2389238