ENGINEERING JOURNAL CHIANG MAI UNIVERSITY

Volume 26, No. 02, Month AUGUST, Year 2019, Pages 147 - 156

Appropriate parameters for breakdown of pesticide by plasma activated water technique

Suchada Phunsathitwong and Komgrit Leksakul

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This research aims to study the appropriate parameters for breakdown of pesticide by plasma activated water technique (PAW) which generates by hybrid plasma system. Plasma Gliding Arc system combined with the production of nano/ micro bubble solution to synthesize •OH Radicals in H2O2 form that causes higher concentration. •OH Radicals are the key of this process. Researcher selected organophosphate group of pesticides that the most common use for fruits and vegetables, that is Chlorpyrifos. There are 3 factors in an experiment consists of 1) the flow rate of argon gas at 8-12 L/min 2) the power at 80-600 W 3) the time of discharged at 20-30 min ,full factorial designs at two levels and 3 center points was applied in order to test the curvature of the proposed plasma system. The results were analyzed by gas chromatography (GC) with Flame Photometric Detector (FPD). The results showed that genearated Chlorpyrifos pesticide solution had decrease from 10 mg/L to 0.25 mg/L which means breakdown of pesticide efficiency is 97.5%. Finally, we could obtain the optimum condition for breakdown Chlorpyrifos pesticide solution which is 12 L/min argon flow rate, 600 W power and 30 min discharging time.

Keywords

Hydroxyl Radical, Plasma, Pesticide, Design of Experiment

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