The processes in the discharge circuit of a powerful high-voltage pulse installation with three multi-gap spark gaps operating in parallel are experimentally investigated. Oscillograms of voltage and current pulses at the load in the form of three reactors are obtained with running water. The discharge processes are compared when using in the discharge circuit three multi-gap dischargers and three reactors connected in parallel, on the one hand, and one such discharger and one reactor on the other. The regimes of synchronous discharges in gas bubbles were obtained in three reactors, which ensured the complete inactivation of the E.coli in water with an initial concentration of 10 6 CFU/cm 3 (CFU is a colony-forming unit). References 5, figures 4, table 1.

Computer simulation of the discharge process in an electric circuit, which contains a pulsed electric in gas bubbles in water, has been perf0rmed. The experimental oscillograms of voltage pulses are compared with the results of computer simulation of voltage pulses on the treated water layer. It is shown that the amplitudes of the voltage pulses directly on the layer of disinfected water in the reactor with a discharge in the gas bubbles are less than those measured in experiments using a capacitive voltage divider. Computer simulations have shown that the shape of the voltage on a layer of water differs significantly that at the point where it is measured by capacitive voltage. In addition, we have shown that the presence of long lines in the bit circuit of the plant must be taken into account. Given the presence of long lines in the bit circuit, the simulation results better correspond to experimental results. References 5, figures 7.

The dependence of the current and voltage on time in discharges in gas bubbles in water used for its purification is studied experimentally. It is shown that at the front of the current pulses with discharges in bubbles there is a kink, after which the rate of current increase sharply increases. The frequency of discharges in bubbles is 10,000 pulses / s at a voltage amplitude of 8 kV on the reactor-the load of the experimental setup generator and currents of 0.2 A in a high-voltage discharge circuit with discharges in gas bubbles. A high degree of purification of water used in coke production was obtained from phenols and thiocyanates. The possibility of improving the organoleptic parameters of water and reducing the biochemical oxygen consumption by it is shown. References 12, figures 5, table 1.

Purpose. Purpose of this work is to create generator of high-voltage nanosecond pulses capable of operating on a load in the form of a layer of water with gas bubbles at a pulse repetition rate of more than 2000 pulses per second, and experimentally investigate with its aid the characteristics of nanosecond discharges in gas bubbles for water purification. Met hodology. Generator of nanosecond pulses was created on the basis of the Tesla transformer scheme.

Purpose. Comparison of electrical circuits of experimental plants for obtaining micro-and nanosecond discharges in gas bubbles in water and comparing the experimental results obtained for disinfecting water using such discharges. Methodology. To obtain high-voltage pulses on the load in the form of a gas bubbles and a layer of water with a frequency of more than 2000 pulses per second, a method of generating micro-and nanosecond pulses using high-voltage pulse generators based on a pulse transformer (PT) according to Tesla, with a transistor opening switch IGBT in the low-voltage part of the circui. A current-limiting resistor with a resistance R cl = 24 k is used to protect the transistor switch at microsecond discharges. At nanosecond discharges, a multi-gap spark gap is used to sharpen the front of high-voltage pulses. We used a capacitive voltage divider with a division factor of K d = 7653 to measure voltage pulses, a shunt with a resistance of R s = 2.5  for measuring current pulses. RIGOL DS1102E digital oscilloscope with a 100 MHz bandwidth was used as a recording device. Results. The effect of micro-and nanosecond discharges in gas bubbles on microorganisms was experimentally investigated. It was possible to reduce the biochemical oxygen consumption of water during microsecond discharges, reduce the turbidity of water, and improve its organoleptic qualities. The energy released in a single pulse with microsecond discharges W µ ≈ 17 mJ, with nanosecond discharges W n ≈ 7.95 mJ. At nanosecond discharges, complete inactivation of E.coli bacteria was achieved. The disinfecting and purifying action of nanosecond pulses is better compared to microsecond pulses due to an increase in the amplitude of the pulsed voltage up to 30 kV, and a pulsed current of up to 35 A. Originality. The possibility of effective microbiological disinfection of water using nanosecond discharges in gas bubbles at low specific energy consumption has been experimentally shown. Practical value. The obtained experimental results on water disinfection using micro-and nanosecond discharges offer the prospect of industrial application of installations using such discharges for disinfecting and purification wastewater, swimming pools, and posttreatment of tap water. References 9, figures 3. Key words: high-voltage generator, micro-and nanosecond pulses, discharge in gas bubbles in water, disinfection and water purification by discharges, inactivation of microorganisms.