Reino Clara, van Loosdrecht Mark C M, Carrera Julián, Pérez Julio
GENOCOV Research Group, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Universitat Autònoma de Barcelona, Ed. Q-Campus UAB, 08193 Bellaterra, Barcelona, Spain.
Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands.
Chemosphere. 2017 Oct;185:336-343. doi: 10.1016/j.chemosphere.2017.07.017. Epub 2017 Jul 5.
In the race to achieve a sustainable urban wastewater treatment plant, not only the energy requirements have to be considered but also the environmental impact of the facility. Thus, nitrous oxide (NO) emissions are a key-factor to pay attention to, since they can dominate the total greenhouse gases emissions from biological wastewater treatment. In this study, NO production factors were calculated during the operation of a granular sludge airlift reactor performing partial nitritation treating a low-strength synthetic influent, and furthermore, the effect of temperature on NO production was assessed. Average gas emission relative to conversion of ammonium was 1.5 ± 0.3% and 3.7 ± 0.5% while the effluent contained 0.5 ± 0.1% and 0.7 ± 0.1% (% N-oxidized) at 10 and 20 °C, respectively. Hence, temperature increase resulted in higher NO production. The reasons why high temperature favoured NO production remained unclear, but different theoretical hypotheses were suggested.
在实现可持续城市污水处理厂的进程中，不仅要考虑能源需求，还要考虑该设施对环境的影响。因此，一氧化二氮（N₂O）排放是一个需要关注的关键因素，因为它们可能在生物废水处理产生的温室气体排放总量中占主导地位。在本研究中，对处理低强度合成进水的颗粒污泥气升式反应器进行部分亚硝化运行期间的N₂O产生因子进行了计算，此外，还评估了温度对N₂O产生的影响。在10℃和20℃时，相对于铵转化的平均气体排放分别为1.5±0.3%和3.7±0.5%，而流出物中分别含有0.5±0.1%和0.7±0.1%（%N-氧化）。因此，温度升高导致更高的N₂O产生。高温有利于N₂O产生的原因尚不清楚，但提出了不同的理论假设。
