Abstract
Underwater discharges are considered to be promising solutions to water disinfection problems. In this paper, the sterilization effects of different discharge modes and gas bubbling conditions on E. coli are investigated. The experimental results show that spark discharge owns a much higher sterilization efficiency than the streamer discharge. The larger discharge volume and stronger UV emission during spark discharge may play a more important role than the electric field and active species in the sterilization efficiency of discharge modes. To further increase the sterilization efficiency, two kinds of feeding gases, O2 and Ar, are introduced in underwater discharges, and experimental results show that O2 bubbling presents a greater promotion than Ar. Higher sterilization efficiency of O2 bubbling than that of Ar can be explained by the combination of physical and chemical reactions, while in the case of Ar, only physical interactions play a major role.
Highlights
Water disinfection has been a popular topic in the recent years due to growing attention on water pollution and shortages
Discharges can be divided into three regions under different applied voltage amplitudes U, i.e., the streamer discharge region (Pb = 0 when U ≤ 27 kV), the streamer-to-spark discharge region (0 < Pb < 1 when 27 < U < 31 kV), and the spark discharge region (Pb = 1 when U ≥ 31 kV)
We investigate the effects of discharge modes on E. coli sterilization
Summary
Water disinfection has been a popular topic in the recent years due to growing attention on water pollution and shortages. Several plasma– liquid interaction configurations have been adopted to investigate the influence of electric discharge on water sterilization, e.g., plasma jet, dielectric barrier discharge, and surface discharge.. Several plasma– liquid interaction configurations have been adopted to investigate the influence of electric discharge on water sterilization, e.g., plasma jet, dielectric barrier discharge, and surface discharge.7,8 For these reactors, active species are first produced in the gas phase where plasma is actively generated. The underwater discharge processes integrate several sterilization factors including active species, pulsed electric field (PEF), UV radiation, and shock waves.. The underwater discharge processes integrate several sterilization factors including active species, pulsed electric field (PEF), UV radiation, and shock waves.15 These factors allow synergistic reactions to occur and thereby improve water disinfection efficiency; underwater discharge has become one of the popular sterilization methods accompanying other traditional approaches The underwater discharge processes integrate several sterilization factors including active species, pulsed electric field (PEF), UV radiation, and shock waves. These factors allow synergistic reactions to occur and thereby improve water disinfection efficiency; underwater discharge has become one of the popular sterilization methods accompanying other traditional approaches
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