Microbial water quality in clean water tanks following inspection and cleaning

Sarah Christine Boesgaard Christensen, Anne Esbjørn, Hans-Jørgen Albrechtsen

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Increased bacterial counts are often registered in drinking water leaving clean water tanks after the tanks have been emptied, inspected and cleaned by flushing. To investigate the reason for the increased bacterial concentrations and consequently limit it, samples from two clean water tanks before, during and after cleaning of the tanks were analysed. Bacteria were quantified, the dominating bacterial groups were identified and re-growth potential in the water was estimated. Bacterial counts did not exceed drinking water guideline values but ATP concentrations in the water were high right after start-up of the tanks, which may indicate that a substantial part of the bacteria in the drinking water leaving the tanks originated from the sand filter. This was supported by 16S DNA analyses.
Original languageEnglish
Publication date2014
Number of pages2
Publication statusPublished - 2014
Event2014 IWA World Water Congress & Exhibition - Lisbon, Portugal
Duration: 21 Sep 201426 Sep 2014


Conference2014 IWA World Water Congress & Exhibition


  • Drinking water
  • Bacteria
  • Sand filter
  • 16S DNA
  • ATP
  • Microbiology


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