A calculation model of the photochemical reactor based on a pulse xenon lamp and intended for water treatment from
microbiological or chemical pollutants has been developed and realized. The model includes several calculation modules, each
one describes the basic physical processes ongoing in the photochemical reactor: current’s form calculation module, pollutant’s
particles trajectories calculation module, pulse lamp’s radiating characteristics calculation module, module for photometric
calculation, determining an energy radiation dose of pollutant particles. Calculation of lamp’s radiating characteristics is based
on ideas of gas discharge physics and on a number of empirical dependences, for calculation of other parameters has been used
the numerical simulation. Model verification has been carried out by comparison of calculated and experimental efficiencies for
two types of photochemical reactors’ designs with use of the known pollutant. The developed calculation model allows perform
multi-parameter optimization for designs and regime parameters of pulse photochemical reactors for the purpose of increase their
energy efficiency, and level of water treatment from various chemical and biological pollutants.