ID: 2198

• Title:
  Determining Properties of Nanosecond Pulse Electric based Water Surface Discharge for Treatment of Water and Wastewater
  
  Authors:
  

  Rahman Md. Mijanur, GSST, Kumamoto University, Japan
  Hosano Nushin, Biomaterials and Bioelectrics Department, IINa, Kumamoto University, Japan
  Hosseini Seyedmasih, GSST, Kumamoto University, Japan
  Ruma, Department of EEE, Dhaka University of Engineering and Technology, Gazipur, Bangladesh
  Farajian Amir A., Department of Mechanical and Materials Engineering, Wright State University, USA
  Hosano Hamid
  GSST, Biomaterials and Bioelectrics Department, IINa, Kumamoto University, Japan
  

  
  
  Abstract:
  Freshwater, which makes up only about 2.5% of the world’s total water supply, is an essential resource for the survival of all living organisms, including humans. Underwater discharge and its dynamics have been studied with great interest over the past few decades for the treatment of drinking and wastewater. However, water surface discharge is not studied yet with much attention. The knowledge of phenomenon of water surface discharge is inadequate yet while it has great impact on water decontaminations. This article reports on the physical characteristics of water surface discharge, including plasma production and propagation, and simultaneous generation of its decontamination products. In order to generate WSD plasma, a nanosecond pulsed electric fields modulator with a charger, a control unit, and a magnetic pulse compression (MPC) circuit was used. A point to plane electrode technique along with positive pulse was employed for water surface discharge. The discharge phenomenon and plasma propagations were visualized using a time-resolved shadowgraph scheme by employing an ultra-high-speed framing camera. Different gap distances between the positive electrode and the surface of water as well as different solution conductivities were considered for the experiments, to confirm and understand the physical mechanisms at different environmental conditions of water and wastewater treatments. The results confirmed some important properties of nanosecond water surface discharge as an effective and highly efficient technique for decontaminating water.
  
  
  
  Keywords:
  Nanosecond pulsed electric field; Water surface discharge; Solution conductivity; Gap distance
  
  Refs:
  
  
  Topic 1:
  13. Pulsed power devices and methods
  
  Topic 2:
  9. Biomass processing and biofuel generation