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• W2025963037 abstract "This paper reports findings from online, continuous monitoring of dissolved and gaseous nitrous oxide (N2O), combined with dissolved oxygen (DO) and ammonia loading, in a full-scale nitrifying activated sludge plant. The study was conducted over eight weeks, at a 210,000 population equivalent sewage treatment works in the UK. Results showed diurnal variability in the gaseous and dissolved N2O emissions, with hourly averages ranging from 0 to 0.00009 kgN2O-N/h for dissolved and 0.00077–0.0027 kgN2O-N/h for gaseous nitrous oxide emissions respectively, per ammonia loading, depending on the time of day. Similarly, the spatial variability was high, with the highest emissions recorded immediately after the anoxic zone and in the final pass of the aeration lane, where ammonia concentrations were typically below 0.5 mg/L. Emissions were shown to be negatively correlated to dissolved oxygen, which fluctuated between 0.5 and 2.5 mgO2/L, at the control set point of 1.5 mgO2/L. The resulting dynamic DO conditions are known to favour N2O production, both by autotrophic and heterotrophic processes in mixed cultures. Average mass emissions from the lane were greater in the gaseous (0.036% of the influent total nitrogen) than in the dissolved (0.01% of the influent total nitrogen) phase, and followed the same diurnal and spatial patterns. Nitrous oxide emissions corresponded to over 34,000 carbon dioxide equivalents/year, adding 13% to the carbon footprint associated with the energy requirements of the monitored lane. A clearer understanding of emissions obtained from real-time data can help towards finding the right balance between improving operational efficiency and saving energy, without increasing N2O emissions." @default.
• W2025963037 created "2016-06-24" @default.
• W2025963037 creator A5015349126 @default.
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• W2025963037 date "2013-02-01" @default.
• W2025963037 modified "2023-10-03" @default.
• W2025963037 title "Nitrous oxide emissions and dissolved oxygen profiling in a full-scale nitrifying activated sludge treatment plant" @default.
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• W2025963037 doi "https://doi.org/10.1016/j.watres.2012.10.004" @default.
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