The dynamics of nitrite formation via nitrification in the drinking water distribution systems

Pirjo-Liisa Rantanen, Tuula Laakso, Riku Vahala, Ilkka Mellin, Merja Ahonen, Minna M. Keinänen-Toivola

Research output: Chapter in Book/Report/Conference proceedingConference contributionProfessional


Both total residual chlorine and ammonium were the key drivers of nitrite formation in the drinking water distribution systems (DWDSs) in the cities of Helsinki and Vantaa, in Finland. However, the disinfection chemical did not inhibit nitrification. Nitrite was formed rapidly in the DWDS after the water treatment plant. The highest nitrite concentrations occurred in early summer when the temperature was rising and the total residual chlorine concentrations were at the highest. Low temperatures did not prevent nitrification but only slowed it down.
Original languageEnglish
Title of host publicationIWA Nutrient Recovery & Removal Conference
Subtitle of host publication1 – 3 SEPTEMBER 2020
PublisherInternational Water Association (IWA)
Number of pages3
Publication statusPublished - 1 Sept 2020
MoE publication typeD3 Professional conference proceedings
EventIWA Nutrient Recovery & Removal Conference: Closing the loop - Virtual, Online
Duration: 1 Sept 20203 Sept 2020


ConferenceIWA Nutrient Recovery & Removal Conference
Abbreviated titleIWA NRR
CityVirtual, Online
Internet address

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