Decreasing dietary nitrogen consumption improves wastewater treatment efficiency and carbon footprint

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-04-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
1961-1968
Series
Water Science and Technology, Volume 87, issue 8
Abstract
This article aimed to connect protein consumption with the nitrogen load to wastewater treatment plants (WWTPs) in Finland. The influence of the changes in nitrogen consumption on the WWTP environmental footprint was estimated using process simulation. As the main result, a connection was found between nitrogen loads from food consumption and the incoming load to a WWTP. This was done by analysing protein consumption data from the Food and Agriculture Organization of the United Nations (FAO) and incoming nitrogen load data from the Finnish environmental institute, SYKE. The impact of nitrogen consumption was estimated using different diet scenarios. Decreasing dietary nitrogen consumption by 16–24% could decrease nitrous oxide emissions by 16–24% and aeration energy (AE) consumption by 6–11%. An increase in dietary nitrogen consumption of 6–42% could increase AE consumption by 2–14% when effluent requirements were met. When considering the environmental impact of this increased aeration, it corresponds to an increase of 2–16%. Furthermore, nitrous oxide emissions could rise by 6–42% This information can be valuable to WWTPs and even consumers for influencing incoming nitrogen loads
Description
Keywords
Dietary nitrogen consumption, Environmental impacts, Greenhouse gas emissions, Nitrogen load to water bodies, Nitrogen removal, Wastewater treatment
Other note
Citation
Rautiainen, N, Rantanen, PL, Jalava, M & Mikola, A 2023, ' Decreasing dietary nitrogen consumption improves wastewater treatment efficiency and carbon footprint ', Water Science and Technology, vol. 87, no. 8, 94231, pp. 1961-1968 . https://doi.org/10.2166/wst.2023.094