QUALITATIVE AND QUANTITATIVE EXAMINATION OF BACTERIA FOUND IN AQUATIC HABITATS .6. BACTERIAL REGROWTH IN DRINKING-WATER

  • 1 January 1983
    • journal article
    • research article
    • Vol. 178  (3) , 263-279
Abstract
Regrowth of bacteria in the sphere of drinking water is dependent on time (stagnation of the water in the distribution system) and on the absence or inefficiency of disinfectants, e.g., clorine and chlorine dioxide. Trace amounts of assimilable organic C are not a presupposition for the multiplication of the bacteria. Even in twice distilled water, growth of bacteria could be observed. Under laboratory conditions it was shown that the number of bacteria increased to 104/ml after a 4-days incubation at 20.degree. C. In particular, the multiplication is concerned with the flora of the water, e.g., Pseudomonas spp. As a result of the identification of the bacteria, it was observed that the increased number of bacteria was accompanied by a decrease of individual species. After a 6-days incubation of the water samples, P. fluorescens and P. cepacia were the predominating bacterial forms. The number of gram-positive bacteria decreased significantly during incubation.

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