Mathematical modeling of nitrous oxide (N2O) emissions from full-scale wastewater treatment plants

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

109 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)7795-7803
Journal / PublicationEnvironmental Science and Technology
Volume47
Issue number14
Publication statusPublished - 16 Jul 2013
Externally publishedYes

Abstract

Mathematical modeling of N2O emissions is of great importance toward understanding the whole environmental impact of wastewater treatment systems. However, information on modeling of N2O emissions from full-scale wastewater treatment plants (WWTP) is still sparse. In this work, a mathematical model based on currently known or hypothesized metabolic pathways for N2O productions by heterotrophic denitrifiers and ammonia-oxidizing bacteria (AOB) is developed and calibrated to describe the N2O emissions from full-scale WWTPs. The model described well the dynamic ammonium, nitrite, nitrate, dissolved oxygen (DO) and N2O data collected from both an open oxidation ditch (OD) system with surface aerators and a sequencing batch reactor (SBR) system with bubbling aeration. The obtained kinetic parameters for N2O production are found to be reasonable as the 95% confidence regions of the estimates are all small with mean values approximately at the center. The model is further validated with independent data sets collected from the same two WWTPs. This is the first time that mathematical modeling of N2O emissions is conducted successfully for full-scale WWTPs. While clearly showing that the NH2OH related pathways could well explain N2O production and emission in the two full-scale plants studied, the modeling results do not prove the dominance of the NH2OH pathways in these plants, nor rule out the possibility of AOB denitrification being a potentially dominating pathway in other WWTPs that are designed or operated differently. © 2013 American Chemical Society.

Bibliographic 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 lbscholars@cityu.edu.hk.

Citation Format(s)

Mathematical modeling of nitrous oxide (N2O) emissions from full-scale wastewater treatment plants. / Ni, Bing-Jie; Ye, Liu; Law, Yingyu et al.
In: Environmental Science and Technology, Vol. 47, No. 14, 16.07.2013, p. 7795-7803.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review