Plasma treatment of aqueous solutes: Some chemical properties of a gliding arc in humid air

Benstaali, Baghdad; Moussa, D.; Addou, A.; Brisset, Jean‐Louis

doi:10.1051/epjap:1998258

Cited by 118 publications

(74 citation statements)

References 10 publications

(16 reference statements)

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“…Effect of plasma discharge, especially on two different kinds of bacteria (staphylococcus aureus and Salmonella) and a type of fungus [Penicillium (mold fungus)] were studied. Results show that G Arc is one of the most considerable systems with more efficiency compared to the advanced oxidation techniques because of low equipment and energy costs [22,23]. Comparing to other plasmas, G Arc plasma is more applicable and appropriate to the industry [22,24].…”

Section: Resultsmentioning

confidence: 99%

Water treatment by the AC gliding arc air plasma

2017

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In this study, the effects of gliding arc (G Arc) plasma system on the treatment of water have been investigated experimentally. An AC power supply of 15 kV potential difference at 50 Hz frequency was employed to generate plasma. Plasma density and temperature were measured using spectroscopic method. The water was contaminated with staphylococcus aureus (Gram-positive) and salmonella bacteria (Gram-negative), and Penicillium (mold fungus) individually. pH, hydrogen peroxide, and nitride contents of treated water were measured after plasma treatment. Decontamination of treated water was determined using colony counting method. Results indicate that G Arc plasma is a powerful and green tool to decontaminate water without producing any byproducts.

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Section: Resultsmentioning

confidence: 99%

Water treatment by the AC gliding arc air plasma

2017

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“…Because the underwater DBD plasma generates an abundance of OH radicals, it may have a general mechanical effect on the E. coli O157:H7 surface. [40][41][42] Micro-organisms in plasma are exposed to an intense attack by these radicals that likely generate surface abrasions that the living cell cannot repair rapidly. This may explain why cells are destroyed very quickly in many cases.…”

Section: Resultsmentioning

confidence: 99%

Roles of individual radicals generated by a submerged dielectric barrier discharge plasma reactor during Escherichia coli O157:H7 inactivation

2015

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A submerged dielectric barrier discharge plasma reactor (underwater DBD) has been used on Escherichia coli O157:H7 (ATCC 35150). Plasma treatment was carried out using clean dry air gas to investigate the individual effects of the radicals produced by underwater DBD on an E. coli O157:H7 suspension (8.0 log CFU/ml). E. coli O157:H7 was reduced by 6.0 log CFU/ml for 2 min of underwater DBD plasma treatment. Optical Emission Spectra (OES) shows that OH and NO (α, β) radicals, generated by underwater DBD along with ozone gas. E. coli O157:H7 were reduced by 2.3 log CFU/ml for 10 min of underwater DBD plasma treatment with the terephthalic acid (TA) OH radical scavenger solution, which is significantly lower (3.7 log CFU/ml) than the result obtained without using the OH radical scavenger. A maximum of 1.5 ppm of ozone gas was produced during the discharge of underwater DBD, and the obtained reduction difference in E.coli O157:H7 in presence and in absence of ozone gas was 1.68 log CFU/ml. The remainder of the 0.62 log CFU/ml reduction might be due to the effect of the NO (α, β) radicals or due to the combined effect of all the radicals produced by underwater DBD. A small amount of hydrogen peroxide was also generated but does not play any role in E. coli O157:H7 inactivation.

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“…NO· and OH· are the main species formed in the plasma during glidarc discharge in humid air. NO· is responsible for acid effects, and OH·, produced in high quantities, is responsible for a strong oxidizing effect (2,19). Both acid and oxidative stresses strongly affect the permeability of the bacterial membrane, transmembrane potential, and intracellular pH (1,31).…”

Section: Discussionmentioning

confidence: 99%

Gliding Arc Discharge in the Potato PathogenErwinia carotovorasubsp.atroseptica: Mechanism of Lethal Action and Effect on Membrane-Associated Molecules

Moreau

Feuilloley

Véron

et al. 2007

Appl Environ Microbiol

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. This prototype also decreases the required duration of treatment by 50%. The study of the time course effect of the process on bacterial morphology suggests that glidarc induces major alterations of the bacterial membrane. We showed that glidarc causes the release of bacterial genomic DNA. By contrast, an apparent decrease in the level of extractible lipopolysaccharide was observed; however, no changes in the electrophoretic pattern and cytotoxic activity of the macromolecule were noted. Analysis of extractible proteins from the outer membrane of the bacteria revealed that glidarc discharge induces the release of these proteins from the lipid environment, but may also be responsible for protein dimerization and/or aggregation. This effect was not observed in secreted enzymatic proteins, such as pectate lyase. Analysis of the data supports the hypothesis that the plasma generated by glidarc discharge is acting essentially through oxidative mechanisms. Furthermore, these results indicate that, in addition to effectively destroying bacteria, glidarc discharge should be used to improve the extraction of bacterial molecules.Industrial guidelines prescribing the use of nonchemical techniques of decontamination have evolved to avoid traces of antibacterial agents in the final product; consequently, this has encouraged research into physical techniques that kill bacteria, such as advanced oxidation processes.Systems based on electric discharge, especially those that generate nonthermal plasma, appear to be very promising because of their low equipment and energy costs, their efficiency on diverse surfaces or media, and even their possible application to heatsensitive materials (25). Producing nonthermal plasma requires specific conditions. Plasmas can be classified according to their energy level and proportion of light (electrons) and heavy species (e.g., molecules, atoms, radicals, and ions). Thermal plasmas, usually formed at high pressure (Ն1 atm), are media in which the energies of the two species are similarly high. By contrast, the mean energy of the electrons at low pressure is much higher than that of the heavy species, and the resulting plasma is designated "cold plasma." There are intermediate conditions at atmospheric pressure which allow for the formation of the nonthermal plasmas. Among the various techniques able to generate nonthermal plasma, we decided to study gliding arc, or "glidarc," discharge. We chose glidarc particularly because of its high industrial potential and its efficiency for decontamination. This technique was previously used for treating Escherichia coli (35), Staphylococcus epidermidis (4), and various species of the potato pathogen, Erwinia (26). Glidarc has been shown to totally destroy Erwinia carotovora subsp. atroseptica, Erwinia chrysanthemi, and Erwinia carotovora subsp. carotovora cultures (26). Bacterial killing using glidarc was achieved directly in the liquid medium at room temperature and was not accompanied by the formation of viable but noncultivable forms. However, thi...

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Plasma treatment of aqueous solutes: Some chemical properties of a gliding arc in humid air

Cited by 118 publications

References 10 publications

Water treatment by the AC gliding arc air plasma

Water treatment by the AC gliding arc air plasma

Roles of individual radicals generated by a submerged dielectric barrier discharge plasma reactor during Escherichia coli O157:H7 inactivation

Gliding Arc Discharge in the Potato PathogenErwinia carotovorasubsp.atroseptica: Mechanism of Lethal Action and Effect on Membrane-Associated Molecules

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