Legionnaires' Disease Bacterium in power-plant cooling systems: Phase 1. Final report

Technical Report · Wed Jun 01 04:00:00 EDT 1983

DOI:https://doi.org/10.2172/5958273· OSTI ID:5958273

Christensen, S W; Solomon, J A; Gough, S B; Tyndall, R L; Fliermans, C B

A survey was undertaken of the distribution, density, viability, and infectivity of Legionnaires' Disease Bacteria (Legionella) in power plant cooling systems. Water samples were collected during each of the four seasons at various locations within each of nine power plants and from ambient waters at each site. Measurements of a number of physical and chemical characteristics were made, and Legionella profiles (density, viability, and infectivity for guinea pigs) were obtained. Legionella were detected in nearly all samples. Water from closed-cycle cooling systems frequently had lower densities of Legionella than the ambient water. Nonetheless, infectious Legionella, as defined by their isolation from inoculated guinea pigs, were significantly more likely to be found in samples from the plant-exposed water of closed-cycle plants than in samples from once-through plants or in ambient samples. A new species (L. oakridgensis) was initially isolated from two of the sites, and it has since been found to have a widespread distribution. Two other organisms found to cause illness in guinea pigs may also be new species. Phase II of the project involves investigating possible cause/effect relationships between physicochemical variables and Legionella. This work may contribute toward eventual control techniques for this pathogen.

• Research Organization: Oak Ridge National Lab., TN (USA); Tennessee Univ., Knoxville (USA); Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5958273
• Report Number(s): EPRI-EA-3153; ON: DE83015814
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200200* -- Fossil-Fueled Power Plants-- Waste Management
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
BACTERIA
COOLING SYSTEMS
DISTRIBUTION
ENERGY SYSTEMS
INFECTIVITY
LEGIONELLA PNEUMOPHILA
MICROORGANISMS
POPULATION DENSITY
POWER PLANTS