鉴定全规模亚硝化反应器中的 N2O 形成和排放。
Identifying N2O formation and emissions from a full-scale partial nitritation reactor.
机构信息
Department of Biosystems Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
Waterschap Hollandse Delta, Handelsweg 100, 2980 GC Ridderkerk, The Netherlands.
出版信息
Water Res. 2016 Jan 1;88:575-585. doi: 10.1016/j.watres.2015.10.047. Epub 2015 Oct 28.
In this study, N2O formation and emissions from a full-scale partial nitritation (SHARON) reactor were identified through a three-weeks monitoring campaign during which the off-gas was analysed for N2O, O2, CO2 and NO. The overall N2O emission was 3.7% of the incoming ammonium load. By fitting the N2O emission to a theoretical gas stripping profile, the N2O emissions could be assigned to aerobically formed N2O and N2O formed under anoxic conditions. This was further substantiated by liquid N2O measurements. Under standard operation, 70% of the N2O emission was attributed to anoxic N2O formation. Dedicated experiments revealed that low dissolved oxygen concentrations (<1.0 gO2·m(-3)) and longer anoxic periods resulted in an increased N2O emission. Minimising or avoiding anoxic conditions has the highest effect in lowering the N2O emissions. As an additional result, the use of the off-gas N2O concentration measurements to monitor the gas-liquid mass transfer rate coefficient (kLa) during dynamic reactor operation was demonstrated.
在这项研究中，通过为期三周的监测活动，对一个全规模部分亚硝化（SHARON）反应器中的 N2O 形成和排放进行了识别，在此期间对废气中的 N2O、O2、CO2 和 NO 进行了分析。总的 N2O 排放量为进入的氨负荷的 3.7%。通过将 N2O 排放拟合到理论气体汽提曲线，可以将 N2O 排放分配给好氧形成的 N2O 和缺氧条件下形成的 N2O。液体 N2O 的测量进一步证实了这一点。在标准操作下，70%的 N2O 排放归因于缺氧 N2O 的形成。专门的实验表明，较低的溶解氧浓度（<1.0 gO2·m(-3)) 和较长的缺氧期会导致 N2O 排放量增加。最小化或避免缺氧条件对降低 N2O 排放的效果最高。作为额外的结果，证明了使用废气 N2O 浓度测量来监测动态反应器运行期间的气液传质系数（kLa）。
Zotero 插件