Investigation on optical and electrical properties of soil discharge under pulse voltage

Many researchers have studied the application of low temperature plasma in soil remediation, but most focus on the degradation efficiency of a specific pollutant, and less attention is paid to the development and evolution process of plasma behind the soil remediation. In this paper, the possible mechanism behind soil discharge under pulse voltage is studied from the perspectives of electricity and optics. The electrical and optical analyses show that the soil discharge under pulse voltage mainly exists at the rising stage of pulse voltage, and the existence time is related with the pulse voltage amplitude. At the same time, the relative intensity of active substances (•OH, H, O Ⅱ and N Ⅰ), vibration temperature and rotational temperature are obtained by using the emission spectrum, which demonstrate that high pulse voltage can increase the concentration of active substances, vibration temperature and rotational temperature.