Performance of an atmospheric plasma discharge reactor for inactivation of Enterocococcus faecalis and Escherichia coli in aqueous media

被引：14

作者：

Murugesan, Pramila ^{[1
]}

Moses, J. A. ^{[1
]}

Anandharamakrishnan, C. ^{[1
]}

机构：

[1] Govt India, Computat Modeling & Nanoscale Proc Unit, Minist Food Proc Ind, Indian Inst Food Proc Technol IIFPT, Thanjavur, Tamil Nadu, India

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2020年 / 8卷 / 04期

关键词：

Plasma reactor; Gas-liquid plasma; Ozone generation; Bacteria inactivation; Fecal pathogens; DIELECTRIC-BARRIER DISCHARGE; NONTHERMAL PLASMA; BACTERIAL INACTIVATION; WATER; FOOD; AIR; JET; STERILIZATION; DEGRADATION; MECHANISMS;

D O I：

10.1016/j.jece.2020.103891

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Several non-thermal plasma-based systems have been explored for the treatment of water. In this study, the performance of an atmospheric pressure gas-liquid phase air non-thermal plasma (NTP) reactor to inactivate both gram-positive (Enterococcus faecalis (E. faecalis)) and gram-negative (Escherichia coli. (E. coli)) bacterial species was studied. The time-dependent effects of different applied voltages (2 kV, 4 kV, and 6 kV) on microbial decontamination were investigated in addition to changes in solution pH, conductivity and electrode temperature. Moreover, reactive oxygen species (ROS), hydroxyl radical ((OH)-O-center dot) and ozone formed during NTP treatment were quantified. Scanning Electron Microscopy (SEM) analysis revealed alterations in the morphological structure of bacteria with NTP treatment. As compared with gram-negative bacteria, gram-positive bacteria was found to be more susceptible to NTP disinfection effects. Inactivation kinetics of E. faecalis and E. coli. was studied in detail and complete inactivation of E. faecalis and E. coli. was observed in 10 min (4 kV) and 15 min (6 kV), respectively. Results confirm that NTP treatment of water is a promising approach for the decontamination of pathogenic bacterial species.

引用

页数：7