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14/08/2018

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A5 - Evaluation of the risk of Legionella spp. development in sanitary installations.

In order to determine whether it is possible to reduce energy use for domestic hot water (DHW) production and distribution, without increasing the risk of Legionella spp. development in sanitary installations, a full-scale test facility was built, consisting of a 200 liters water tank, a circulation system of nearly 40 metres long and 2 draw-off pipes. On a daily basis, a consumption profile corresponding to the DHW use of a single family (4 persons) was applied separately using two tap pipes, one corresponding to a kitchen and the other to a bathroom. Legionella spp. was cultivated in a separate water tank and then introduced into the test facility. The DHW production temperature was kept at 45°C with a periodical heating to 60°C for different durations and different frequencies. Legionella spp. concentrations were measured, both in the water and in the biofilm. The influence of different parameters was studied: disinfection of the sampling taps, flow rate of sampling, disinfection of the circulation system only or in combination with the draw-off pipes.

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