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Enterovirus concentrations at collection sites of surface waters for drinking water production

Enterovirusconcentraties bij innamepunten van oppervlaktewater voor de bereiding van drinkwater

Synopsis

This report summarises all measured enterovirus concentrations in surface waters, which are used as source for drinking water production, for the period 1978-1996. Most of these measurements were performed in the large rivers during the winter period, when concentrations reach maximum levels. In the large rivers enterovirus concentrations were on average 0.4-3.0 per litre, reaching a maximum of 13 per litre. In other large surface waters (IJsselmeer, Haringvliet, Drentsche Aa) concentrations were on average 0.014-0.022 per litre, reaching a maximum of 0.45 per litre. An indication of the treatment required to produce safe drinking water from surface water can be derived assuming a maximum allowable concentration of 1.83 x 10-7 viruses per litre in drinking water (risk of infection of 10-4 per person per year). The required treatment was on average 6-7 log units, with a maximum of 8 log units for surface water from the large rivers. For other surface waters the required treatment amounted to 5 log units on average and 6 at maximum.
 

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