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UDC 628.166.085

Bogun P. V.

On increasing the capacity of UV-units for liquid disinfection

Summary

The results of theoretical studies of the possible capacity improvement of units for disinfecting liquids including water by ultraviolet irradiation eliminating any increase in energy consumption are presented. Capacity improvement is possible at the fixed reactor geo­metry and source strength owing to the redistribution of liquid flows in the reactor. It is shown that the maximum possible efficient radiation dose is equal to the mean by reactor volume radiation intensity multiplied by the mean time of liquid residence in the reactor. The necessary and sufficient condition for obtaining this dose is the availability of liquid flow in every point of the reactor volume and equal radiation dose for every microvolume of liquid. By way of example the calculations of the maximum possible radiation dose for a spherical reactor with a point source of radiation and for a cylindrical reactor with a linear radiation source are presented. It is noted that widely manufactured at present UV water disinfection unit designs with a single source (a lamp) use only 30% of the source capa­city. The design with a cylindrical reactor and spiral downward liquid flow distributed along the reactor length provides for the maximum possible radiation dose and/or capacity of the installation.

Key words

water disinfection , ultraviolet irradiation , irradiation dose , reactor , installation capacity

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REFERENCES

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