ANALYSIS OF THE DIFFERENT METHODICAL APPROACHES DIRECTED ON THE ELIMINATION OF PLANKTON FORMS AND LEGIONELLA BIOFILMS FROM POTENTIALLY DANGEROUS WATER SYSTEMS

Aim. Comparative study of the different methodical approaches directed on the elimination of plankton forms and Legionella biofilms from potentially dangerous water systems. Materials and methods. Evaluation of short-term heatingof water to 70^OC implemented in water supply module by volume 290 L with regulated temperature profile. Evaluation of catalytic cleansing of water implemented in the pool for water birds by volume 10 000 L. The initial, intermediate and final level of water objects colonization by L. pneumophila determined accordance MUK 4.2.2217-07. Presence of biofilms associated with L .pneumophila on the surface of the equipment, water surface and ball valves of water supply system determined visual with subsequent bacteriological confirmation by L. pneumophila isolation from biofilms. Results. The high level of bactericidal activity against L. pneumophila plankton forms and biofilms was shown by both methods. Short-term heating to 70^O during 24 hours prevented Legionella growth for 2 months of management. The catalytic cleansing of water against high initial level of contamination of water object by L. pneumophila manifested not earlier 3 weeks of maintenance and continued during 2 months. Conclusion. The presented methodical approaches can be used for development of efficient strategy of prevention of legionellosis during management of the different potentially dangerous water systems in public buildings.

L.pneumophila, L. pneumophila, water objects, biofilms, prevention