Application of Experimental Design to Improve Wastewater Quality from the Process of Washing Vegetables in Factory by Plasma Technology
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Abstract
This research aims to study wastewater treatment by Plasma jet RF to explore its effectiveness in improving wastewater quality. Full factorial designs with two levels and three center points at the 95% confidence level were applied for this purpose. Three factors were studied: 1) 20–30 Watts of the power; 2) Argon gas flow rate of 2–4 L/min and the addition of 1% oxygen to argon; and 3) the discharge time of 10–20 minutes. Then the performance of the plasma wastewater treatment system was evaluated based on the total viable plate count. As a result, the optimal parameter set was defined as the power of 20 Watts, argon gas flow rate of 4 L/min, 1% oxygen in argon and discharge time of 10 minutes. The optimal parameters could reduce the total viable plate count by 54.07%.
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