A novel methodology to quantify nitrous oxide emissions from full-scale wastewater treatment systems with surface aerators

Liu Ye; Bing-Jie Ni; Yingyu Law; Craig Byers; Zhiguo Yuan

doi:10.1016/j.watres.2013.09.037

A novel methodology to quantify nitrous oxide emissions from full-scale wastewater treatment systems with surface aerators

Liu Ye
, Bing-Jie Ni
, Yingyu Law
, Craig Byers
, Zhiguo Yuan

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

67 Citations (Scopus)

Abstract

The quantification of nitrous oxide (N₂O) emissions from open-surface wastewater treatment systems with surface aerators is difficult as emissions from the surface aerator zone cannot be easily captured by floating hoods. In this study, we propose and demonstrate a novel methodology to estimate N₂O emissions from such systems through determination of the N₂O transfer coefficient (k_La) induced by surface aerators based on oxygen balance for the entire system. The methodology is demonstrated through its application to a full-scale open oxidation ditch wastewater treatment plant with surface aerators. The estimated k_La profile based on a month-long measurement campaign for oxygen balance, intensive monitoring of dissolved N₂O profiles along the oxidation ditch over a period of four days, together with mathematical modelling, enabled to determine the N₂O emission factor from this treatment plant (0.52±0.16%). Majority of the N₂O emission was found to occur in the surface aerator zone, which would be missed if the gas hood method was applied alone. © 2013 Elsevier Ltd.

Original language	English
Pages (from-to)	257-268
Journal	Water Research
Volume	48
Issue number	1
DOIs	https://doi.org/10.1016/j.watres.2013.09.037
Publication status	Published - 1 Jan 2014
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

This study was funded by the Australian Research Council, Western Australia Water Corporation and Melbourne Water Corporation through project LP0991765. Bing-Jie Ni acknowledges the supports of Australian Research Council Discovery Early Career Researcher Award (DE130100451). The authors also gratefully acknowledge the contribution of Diana Aoun (Western Australia Water Corporation) for her support in the collection of field data.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 6 Clean Water and Sanitation
SDG 13 Climate Action

Research Keywords

Emission factor
Greenhouse gases
Modelling
Nitrous oxide
Surface aerators
Wastewater treatment

Policy Impact

Cited in Policy Documents

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10.1016/j.watres.2013.09.037

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abstract = "The quantification of nitrous oxide (N2O) emissions from open-surface wastewater treatment systems with surface aerators is difficult as emissions from the surface aerator zone cannot be easily captured by floating hoods. In this study, we propose and demonstrate a novel methodology to estimate N2O emissions from such systems through determination of the N2O transfer coefficient (kLa) induced by surface aerators based on oxygen balance for the entire system. The methodology is demonstrated through its application to a full-scale open oxidation ditch wastewater treatment plant with surface aerators. The estimated kLa profile based on a month-long measurement campaign for oxygen balance, intensive monitoring of dissolved N2O profiles along the oxidation ditch over a period of four days, together with mathematical modelling, enabled to determine the N2O emission factor from this treatment plant (0.52±0.16\%). Majority of the N2O emission was found to occur in the surface aerator zone, which would be missed if the gas hood method was applied alone. {\textcopyright} 2013 Elsevier Ltd.",

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AU - Byers, Craig

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N2 - The quantification of nitrous oxide (N2O) emissions from open-surface wastewater treatment systems with surface aerators is difficult as emissions from the surface aerator zone cannot be easily captured by floating hoods. In this study, we propose and demonstrate a novel methodology to estimate N2O emissions from such systems through determination of the N2O transfer coefficient (kLa) induced by surface aerators based on oxygen balance for the entire system. The methodology is demonstrated through its application to a full-scale open oxidation ditch wastewater treatment plant with surface aerators. The estimated kLa profile based on a month-long measurement campaign for oxygen balance, intensive monitoring of dissolved N2O profiles along the oxidation ditch over a period of four days, together with mathematical modelling, enabled to determine the N2O emission factor from this treatment plant (0.52±0.16%). Majority of the N2O emission was found to occur in the surface aerator zone, which would be missed if the gas hood method was applied alone. © 2013 Elsevier Ltd.

AB - The quantification of nitrous oxide (N2O) emissions from open-surface wastewater treatment systems with surface aerators is difficult as emissions from the surface aerator zone cannot be easily captured by floating hoods. In this study, we propose and demonstrate a novel methodology to estimate N2O emissions from such systems through determination of the N2O transfer coefficient (kLa) induced by surface aerators based on oxygen balance for the entire system. The methodology is demonstrated through its application to a full-scale open oxidation ditch wastewater treatment plant with surface aerators. The estimated kLa profile based on a month-long measurement campaign for oxygen balance, intensive monitoring of dissolved N2O profiles along the oxidation ditch over a period of four days, together with mathematical modelling, enabled to determine the N2O emission factor from this treatment plant (0.52±0.16%). Majority of the N2O emission was found to occur in the surface aerator zone, which would be missed if the gas hood method was applied alone. © 2013 Elsevier Ltd.

KW - Emission factor

KW - Greenhouse gases

KW - Modelling

KW - Nitrous oxide

KW - Surface aerators

KW - Wastewater treatment

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A novel methodology to quantify nitrous oxide emissions from full-scale wastewater treatment systems with surface aerators

Abstract

Bibliographical note

Funding

UN SDGs

Research Keywords

Policy Impact

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