Seasonal and diurnal variations of GHG emissions measured continuously at the Viikinmäki underground WWTP

Anna Kuokkanen, Anna Mikola, Mari Heinonen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

3 Citations (Scopus)


The gaseous emissions of an underground activated sludge treatment plant with total nitrogen removal have been measured on-line since 2012. The continuous Fourier transform infrared (FT-IR) measurement of CO2, NO, NO2, N2O, NH3 and CH4 is situated in the single exhaust air pipe, thus covering the whole wastewater treatment process. The measurement data from 2015 showed that the seasonal and diurnal variations of N2O and CH4 are considerable. When comparing N2O and CH4 emissions as CO2 equivalents to CO2 formed in the activated sludge process, the impact of N2O was dominant. The CH4 emission was considerably
smaller, and the emissions of NOx and NH3 from biological treatment were small. The long term variations of N2O or CH4 production were not linked directly to load variations or other “apparent” factors such as temperature, nitrogen load, nitrogen reduction or anoxic volume. There was neither a clear seasonal pattern. The short interval variations of N2O were similar to but not identical with CO2 variations.
Original languageEnglish
Title of host publicationFrontiers in wastewater treatment and modelling
Subtitle of host publicationFICWTM 2017
EditorsGiorgio Mannina
Pages690 - 694
Number of pages5
ISBN (Electronic)978-3-319-58421-8
ISBN (Print)978-3-319-58420-1
Publication statusPublished - May 2017
MoE publication typeA4 Article in a conference publication
EventFrontiers International Conference on Wastewater Treatment - Palermo, Italy
Duration: 21 May 201724 May 2017

Publication series

NameLecture notes in civil engineering
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


ConferenceFrontiers International Conference on Wastewater Treatment
Abbreviated titleFICWTM


  • GHG
  • N2O
  • WWtp
  • FTIR


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