Yamamoto H, Ezaki T, Ikedo M, Yabuuchi E
Department of Microbiology, Gifu University School of Medicine, Japan.
Microbiol Immunol. 1991;35(9):795-802. doi: 10.1111/j.1348-0421.1991.tb01612.x.
The effects of biocidal treatments for cooling towers were examined through the use of chemicals and ultraviolet irradiation to inhibit the growth of legionellae and other microorganisms. In the water of cooling towers without continuous biocidal treatments, heterotrophic bacteria and bacterivorous protozoan first appeared, and then legionellae increased up to 10(4) CFU/100 ml. When a UV sterilizer was connected to the cooling tower, the legionellae count was 1/10 or 1/100 of that in the nontreated tower water. In the water of towers supplemented continuously with the biocidal chemicals, legionellae were not found during a 4-month period. The biocidal treatments tested were proved to suppress the increase of legionellae in cooling-tower water, and thus are useful in preventing the outbreak of legionellosis due to inhalation of contaminated aerosol from the cooling tower system.
通过使用化学物质和紫外线照射来抑制军团菌和其他微生物的生长，研究了冷却塔杀菌处理的效果。在未进行连续杀菌处理的冷却塔水中，首先出现了异养细菌和食细菌原生动物，然后军团菌数量增加到10⁴ CFU/100 ml。当紫外线消毒器连接到冷却塔时，军团菌数量是未处理塔水的1/10或1/100。在持续添加杀菌化学物质的冷却塔水中，在4个月的时间内未发现军团菌。所测试的杀菌处理被证明可抑制冷却塔水中军团菌的增加，因此有助于预防因吸入冷却塔系统受污染气溶胶而导致的军团病爆发。
