Abstract
A novel water treatment technique, based on a combination of electrospraying and pulsed corona discharge, has been used for bio-decontamination of wastewater. The electrospraying process has been found to increase the surface area of the treated wastewater, and hence increases the efficiency of the corona treatment process. The phase diagram of the discharge, which characterizes the discharge regimes, has been identified experimentally. The survival ratio of the microorganisms has been investigated experimentally as a function of the applied voltage and the numbers of treatment runs using air and oxygen as working gases. Microorganism surface has been examined using scanning electron microscope (SEM), which enabled in understanding the decontamination mechanisms of the treated microorganism. A complete decontamination has been achieved after only one run for an applied voltage higher than 16 kV when the discharge system was operated in oxygen gas. Optical emission spectrum of the electrosprayed water confirmed the existence of OH-radicals responsible for decontamination process.
Highlights
Wastewater contains countless numbers of biological contaminants, living micro-organisms, bacteria, protozoa, fungi and so on
Modern treatment methods of wastewater are based on the advanced oxidation processes (AOPs), which involve an input of energy into the water matrix to produce highly reactive radical intermediates, which attack and destroy the target compounds [2]
The incorporation of electro-spraying with corona discharge leads to an increase in the surface area of the water to be treated by corona discharge and results in increasing the efficiency of the system compared to other systems utilizing corona discharge only
Summary
Wastewater contains countless numbers of biological contaminants, living micro-organisms, bacteria, protozoa, fungi and so on. Modern treatment methods of wastewater are based on the advanced oxidation processes (AOPs), which involve an input of energy (either chemical, electrical or radiative) into the water matrix to produce highly reactive radical intermediates, which attack and destroy the target compounds [2]. Electrosprayed pulsed corona discharge has been introduced recently in wastewater treatment [3]. The process is based on a combination of corona discharge with electro-spraying. The pulsed high-voltage corona discharges generate plasma that initiate a variety of physical and chemical effects at high electric field, intense ultraviolet radiation, and lead to the formation of various reactive chemical species (such as OH, O3, O and H2O2), which react with microorganisms and chemical compounds dissolved in water [9]
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