Gas Flow Effect on E. coli and B. subtilis Bacteria Inactivation in Water Using a Pulsed Dielectric Barrier Discharge

Experimental Evaluation of DBD Reactor Applied to Bacterial Inactivation in Water Flowing Continuously

“…In the implementation of the proposed experimental setup was obtained an energy saving of 44% compared with [21] and [22], and during the experimentation, the pH and electrical conductivity did not vary significantly. In the experiments carried out at high concentrations, it was observed that E. coli bacteria exhibit a high vulnerability to the effects generated during DBD.…”

“…It was attributed to the time required for each pulse, which was inferior to the period needed for water to cross the longitudinal section of the DBD reactor chamber (85×10 4 µs, when the peristaltic pump was operated at the maximum fluid flow rate). In this work, 500 mL of water inoculated with E. coli or E. cloacae bacteria was treated with a minimum energy saving of 44% compared with the previous research [21]. In the production of other electrohydraulic discharges such as pulsed corona discharge (0.5-13.5 J/pulse [35]- [38]) and pulsed arc discharge (0.180-0.720 kJ/pulse [39]), the energy consumption required by DBD was considerably lower.…”

“…In the production of other electrohydraulic discharges such as pulsed corona discharge (0.5-13.5 J/pulse [35]- [38]) and pulsed arc discharge (0.180-0.720 kJ/pulse [39]), the energy consumption required by DBD was considerably lower. Rodríguez-Méndez et al [21], [22] obtained 100 and 117 mJ per pulse in inactivation of E. coli bacteria contained in 15 mL when the volume of water is maintained in static conditions. The obtained results are attributed to the density of the medium to which the discharge was applied.…”

“…1). Injection of oxygen gas was performed due to its high effectiveness in the production of reactive chemical species, useful to eliminate bacteria like E. coli [21]. In addition, to benefit the process, when water flowed through the DBD reactor, discharge was carried out both in the liquid and gas phases (both at 21°C) to contribute to the generation of chemical species into the water; then in all the cases, continuous oxygen injection at 8.3 mL/s at 21°C was carried out.…”

The OES Diagnosis in Removal of HCHO by the Uniform Bipolar Nanosecond-Pulsed DBD Using Wire-Cylinder Electrode Configuration in Atmospheric N2

“…AP nanosecond high-voltage pulsed discharge (NHVPD) is one of nonthermal plasma techniques which has actively been investigated in many laboratories for its broad application prospects in surface modification and thin-film deposition [7], [8], decomposition of volatile organic compounds (VOCs) [9], [10], bacteria inactivation [11], tumoral cell treatment [12], and so on. Some investigations show that nanosecond-pulsed discharges have some unique advantages compared with the direct current (dc) or sinusoidal alternating current (ac) discharges.…”