Development of Agricultural Soil Sterilization Using Ozone Generated by High Frequency Dielectric Barrier Discharge

摘要

We have developed the ozone generation system suitable for soil sterilization and ozone supplying system into the soil.The coaxial dielectric barrier discharge produced the ozone with high concentration at high efficiency.Injection of the on- site generated ozone gas into the soil resulted in decreasing soil pathogen and changing chemical properties of the soil.We studied ozone sterilization of agricultural soil when it was treated by varying ozone dosages and process duration.The temporal and spatial properties of the soil were monitored using the pH and electrical conductivity.The bacteria populations,pathogen and soil-borne fungi were measured after various ozone treatment procedures.100g/m~3 of ozone was injected into the soil at a flow rate of 2 liter/min during 60 min.The pH shows drastic change in 40 min that will be one of indexes indicating the sterilization level.In this treatment 100% of the bacteria in the agricultural soil was killed.