Advanced Water Management Centre, The University of Queensland, St Lucia, Queensland 4072, Australia.
Water Res. 2010 Feb;44(3):831-44. doi: 10.1016/j.watres.2009.10.033. Epub 2009 Nov 4.
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-Nper 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.
目前，国际上缺乏针对生物营养去除（BNR）废水系统中温室气体氧化亚氮（N2O）排放估算的指导意见。本研究采用严格的质量平衡方法，提供了来自七个大型生物营养去除（BNR）废水处理厂（WWTP）的全面 N2O 排放和形成结果。结果表明，N2O 的形成始终为正，但在七个工厂之间高度可变。计算出的 N2O 生成范围为 0.006-0.253 kgN2O-N/kgN 反硝化（平均：0.035+/-0.027）。本文研究了 N2O 形成的可能机制，而不是排放的位置。较高的 N2O 生成通常与较高的亚硝酸盐浓度相对应，但由于存在许多相互竞争和并行的氮转化反应，因此很难清楚地确定 N2O 产生的主要机制。为实现低出水 TN（即 <10 mgN L(-1)) 而设计和运行的 WWTP 比仅实现部分反硝化的 WWTP 具有更低且更不易变的 N2O 生成因子。
