Disinfectant treatment of liquids with high specific electrical conductivity by high-voltage nanosecond pulses with a subnanosecond front
DOI:
https://doi.org/10.20998/2074-272X.2025.5.09Keywords:
water disinfection with high-voltage pulses, discharge unit, high-voltage streamer plasma electrode, nanosecond discharge in gas bubbles in water, long electric line, sub-nanosecond rise time of high voltageAbstract
Purpose. The purpose of the work is to determine, using computer modelling, energy-efficient modes of disinfecting treatment of water-containing liquids with high specific electrical conductivity using high voltage nanosecond pulses with a subnanosecond front including pulsed discharges in gas bubbles. Methods. We considered methods of obtaining high-voltage nanosecond pulses with sub-nanosecond fronts. To achieve this goal, we used computer simulation using Micro-Cap 12. We also used analytical and empirical formulas for calculating the electric field strength, inductive and resistive phases of energy switching from a capacitive source to resistive-inductive loads. We have applied the method of comparing calculated and experimental results. Results. Energy-efficient modes of disinfecting treatment of water-containing liquids with high specific electrical conductivity using nanosecond discharges with a subnanosecond front in gas bubbles are such modes when the active resistance of the treated liquid is 10–40 W. In this case, the lumped inductance of the discharge circuit during liquid treatment does not exceed 2 nH, the capacitance of the layer of the treated liquid is 3.6–14 pF with an amplitude of pulses from a high-voltage low-resistance source of at least 30 kV and a pulse frequency of 1500–2000 pulses per second. With an increase in the active resistance of the liquid within the specified limits, the amplitude of the voltage on the layer of the treated liquid increases under other unchanged conditions, including with an unchanged amplitude of the voltage from the source. The voltage amplitude on the layer of the treated liquid with such an increase can exceed the voltage amplitude from the source by 1.6 times, and exceed the voltage on the reactor as a whole (the series connection of the bulk streamer and the water layer). This happens due to the presence of a lumped inductance in the discharge circuit, in which energy is stored during discharge. Scientific novelty. We have shown the possibility of using nanosecond discharges with sub-nanosecond fronts in gas bubbles for energy-efficient disinfection of liquids, including those with high specific electrical conductivity. In this case, a plasma electrode – a volumetric streamer – acts as a high-voltage electrode in the disinfection of liquids. Practical value. The obtained of the computer modelling results confirm the possibility of industrial application of nanosecond discharges with a sub-nanosecond front for disinfection and purification of water-containing liquids with high specific electrical conductivity. References 23, figures 13.
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