Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge

Nitrous oxide (N2O) gas transfer was studied in a full-scale process to correlate liquid phase N2O concentrations with gas phase N2O emissions and compare methods of determining the volumetric mass transfer coefficient, KLa. Off-gas and liquid phase monitoring were conducted at the Viikinmäki wastew...

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Autores principales:	Shanna Myers, Anna Mikola, Kati Blomberg, Anna Kuokkanen, Diego Rosso
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	full-scale gas transfer greenhouse gases nitrous oxide off-gas wastewater treatment Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/34dc557e6d064459b1c18be03ef99f0b
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spelling	oai:doaj.org-article:34dc557e6d064459b1c18be03ef99f0b2021-11-06T10:42:33ZComparison of methods for nitrous oxide emission estimation in full-scale activated sludge0273-12231996-973210.2166/wst.2021.033https://doaj.org/article/34dc557e6d064459b1c18be03ef99f0b2021-02-01T00:00:00Zhttp://wst.iwaponline.com/content/83/3/641https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Nitrous oxide (N2O) gas transfer was studied in a full-scale process to correlate liquid phase N2O concentrations with gas phase N2O emissions and compare methods of determining the volumetric mass transfer coefficient, KLa. Off-gas and liquid phase monitoring were conducted at the Viikinmäki wastewater treatment plant (WWTP) over a two-week period using a novel method for simultaneous measurement of dissolved and off-gas N2O and O2 from the same location. KLa was calculated with three methods: empirically, based on aeration superficial velocity, from experimentally determined O2 KLa, and using a static value of best fit. The findings of this study indicated trends in local emitted N2O consistently matched trends in local dissolved N2O, but the magnitude of N2O emissions could not be accurately estimated without correction. After applying a static correction factor, the O2 method, using experimentally determined O2 KLa, provided the best N2O emission estimation over the data collection period. N2O emissions estimated using the O2 method had a root mean square error (RMSE) of 70.5 compared against measured concentrations ranging from 3 to 1,913 ppm and a maximum 28% error. The KLa value, and therefore the method of KLa determination, had a significant impact on estimated emissions.Shanna MyersAnna MikolaKati BlombergAnna KuokkanenDiego RossoIWA Publishingarticlefull-scalegas transfergreenhouse gasesnitrous oxideoff-gaswastewater treatmentEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 3, Pp 641-651 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	full-scale gas transfer greenhouse gases nitrous oxide off-gas wastewater treatment Environmental technology. Sanitary engineering TD1-1066
spellingShingle	full-scale gas transfer greenhouse gases nitrous oxide off-gas wastewater treatment Environmental technology. Sanitary engineering TD1-1066 Shanna Myers Anna Mikola Kati Blomberg Anna Kuokkanen Diego Rosso Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge
description	Nitrous oxide (N2O) gas transfer was studied in a full-scale process to correlate liquid phase N2O concentrations with gas phase N2O emissions and compare methods of determining the volumetric mass transfer coefficient, KLa. Off-gas and liquid phase monitoring were conducted at the Viikinmäki wastewater treatment plant (WWTP) over a two-week period using a novel method for simultaneous measurement of dissolved and off-gas N2O and O2 from the same location. KLa was calculated with three methods: empirically, based on aeration superficial velocity, from experimentally determined O2 KLa, and using a static value of best fit. The findings of this study indicated trends in local emitted N2O consistently matched trends in local dissolved N2O, but the magnitude of N2O emissions could not be accurately estimated without correction. After applying a static correction factor, the O2 method, using experimentally determined O2 KLa, provided the best N2O emission estimation over the data collection period. N2O emissions estimated using the O2 method had a root mean square error (RMSE) of 70.5 compared against measured concentrations ranging from 3 to 1,913 ppm and a maximum 28% error. The KLa value, and therefore the method of KLa determination, had a significant impact on estimated emissions.
format	article
author	Shanna Myers Anna Mikola Kati Blomberg Anna Kuokkanen Diego Rosso
author_facet	Shanna Myers Anna Mikola Kati Blomberg Anna Kuokkanen Diego Rosso
author_sort	Shanna Myers
title	Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge
title_short	Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge
title_full	Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge
title_fullStr	Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge
title_full_unstemmed	Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge
title_sort	comparison of methods for nitrous oxide emission estimation in full-scale activated sludge
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/34dc557e6d064459b1c18be03ef99f0b
work_keys_str_mv	AT shannamyers comparisonofmethodsfornitrousoxideemissionestimationinfullscaleactivatedsludge AT annamikola comparisonofmethodsfornitrousoxideemissionestimationinfullscaleactivatedsludge AT katiblomberg comparisonofmethodsfornitrousoxideemissionestimationinfullscaleactivatedsludge AT annakuokkanen comparisonofmethodsfornitrousoxideemissionestimationinfullscaleactivatedsludge AT diegorosso comparisonofmethodsfornitrousoxideemissionestimationinfullscaleactivatedsludge
_version_	1718443787067326464

Comparison of methods for nitrous oxide emission estimation in full-scale activated sludge

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