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Effects of FLONLIZER®, Ultraviolet Sterilizer, on Legionella Species Inhabiting Cooling Tower Water
Author(s) -
Yamamoto Hiroyuki,
Urakami Itsuo,
Nakano Koji,
Ikedo Masanari,
Yabuuchi Eiko
Publication year - 1987
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.1987.tb03136.x
Subject(s) - biology , legionella , cooling tower , ultraviolet , tower , ecology , zoology , microbiology and biotechnology , water cooling , bacteria , archaeology , engineering , history , quantum mechanics , mechanical engineering , genetics , physics
Legionella pneumophila in sterile distilled water was not detected after ultraviolet irradiation by FLONLIZER®, a new‐type sterilizer, at a flow rate of 82.5 to 364.8 liters/hr. When irradiated by FLONLIZER® at a flow rate of under 324.0 liters/hr, no viable cells of legionellae, other heterotrophic bacteria and bacterivorous protozoa were detected in the cooling tower water, which was found to contain L. pneumophila . No viable cells of L. pneumophila and L. bozemanii suspended in sterile distilled water were detected after the irradiation with UV‐doses of over 6.16 × 10 3 μ W·sec/cm 2 . At the irradiation of low UV‐doses under 1.06 × 10 4 μ W·sec/cm 2 , the viable count of legionellae recuperated by photoreactivation from UV‐damage increased with the exposure time under a white fluorescent lamp. However, in the samples irradiated with UV‐doses of over 3.52 × 10 4 μ W·sec/cm 2 , equal to the FLONLIZER®, legionellae did not recuperate even after 18 hr illumination with a white fluorescent lamp. FLONLIZER® is thus expected to act as a sterilizer which can control the legionellae inhabiting cooling tower systems placed in outdoor space.