期刊
WATER RESEARCH
卷 44, 期 3, 页码 831-844出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.10.033
关键词
Nitrous oxide; Nitrite; Mass balance; Mass transfer; Greenhouse gas; Biological nutrient removal
资金
- Water Services Association of Australia (WSAA)
- Brisbane City Council
- Toowoomba Regional Council
- Western Australia Water Corporation
- SA Water
- Melbourne Water
- Sydney Water and United Water international (UWI)
International guidance for estimating emissions of the greenhouse gas, nitrous oxide (N(2)O), from biological nutrient removal (BNR) wastewater systems is presently inadequate. This study has adopted a rigorous mass balance approach to provide comprehensive N(2)O emission and formation results from seven full-scale BNR wastewater treatment plants (WWTP). N(2)O formation was shown to be always positive, yet highly variable across the seven plants. The calculated range of N(2)O generation was 0.006-0.253 kgN(2)O-N per kgN denitrified (average: 0.035 +/- 0.027). This paper investigated the possible mechanisms of N(2)O formation, rather than the locality of emissions. Higher N(2)O generation was shown to generally correspond with higher nitrite concentrations, but with many competing and parallel nitrogen transformation reactions occurring, it was very difficult to clearly identify the predominant mechanism of N(2)O production. The WWTPs designed and operated for low effluent TN (i.e. <10 mgN L(-1)) had lower and less variable N(2)O generation factors than plants that only achieved partial denitrification. (c) 2009 Elsevier Ltd. All rights reserved.
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