Abstract
A nutrient solution treatment system using corona plasma is developed for practical use in hydroponics. A gas-liquid separated reactor and a high voltage power supply based on a 20 kHz inverter neon-transformer are developed to archive the treatment with high energy efficiency, a low initial cost and a low running cost. The performance of the system on bacteria inactivation in the nutrient solution is evaluated in a continuous treatment system operation. The results show that the standard plate count for background microflora and R. solanacearum is drastically reduced by the plasma treatment and is not detected after 8 days treatment. The nutrient solution is decontaminated by 4 log cycle with plasma treatment under the continuous operation condition.
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