The UV Dose Used for Disinfection of Drinking Water in Sweden Inadequately Inactivates Enteric Virus with Double-Stranded Genomes
Artikel i vetenskaplig tidskrift, 2022

Irradiation with ultraviolet light (UV) at 254 nm is effective in inactivating a wide range of human pathogens. In Sweden, a UV dose of 400 J/m2 is often used for the treatment of drinking water. To investigate its effect on virus inactivation, enteric viruses with different genomic organizations were irradiated with three UV doses (400, 600, and 1000 J/m2), after which their viability on cell cultures was examined. Adenovirus type 2 (double-stranded DNA), simian rotavirus 11 (double-stranded RNA), and echovirus 30 (single-stranded RNA) were suspended in tap water and pumped into a laboratory-scale Aquada 1 UV reactor. Echovirus 30 was reduced by 3.6-log10 by a UV dose of 400 J/m2. Simian rotavirus 11 and adenovirus type 2 were more UV resistant with only 1-log10 reduction at 400 J/m2 and needed 600 J/m2 for 2.9-log10 and 3.1-log10 reductions, respectively. There was no significant increase in the reduction of viral viability at higher UV doses, which may indicate the presence of UV-resistant viruses. These results show that higher UV doses than those usually used in Swedish drinking water treatment plants should be considered in combination with other barriers to disinfect the water when there is a risk of fecal contamination of the water.

enteric viruses

echovirus 30

ultraviolet light

rotavirus SA11

human adenovirus 2

drinking water


Fredy Saguti

Göteborgs universitet

M. P. Churqui

Göteborgs universitet

Inger Kjellberg

Hao Wang

Göteborgs universitet

Sahlgrenska universitetssjukhuset

Jakob Ottoson


Catherine Paul

Lunds universitet

Olof Bergstedt

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Helene Norder

Göteborgs universitet

Sahlgrenska universitetssjukhuset

Kristina Nyström

Sahlgrenska universitetssjukhuset

Göteborgs universitet

International Journal of Environmental Research and Public Health

1661-7827 (ISSN) 1660-4601 (eISSN)

Vol. 19 14









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