Plant-integrated and on-site gas emissions were quantified from a Swedish wastewater treatment plant by applying several optical analytical techniques and measurement methods. Plant-integrated CH₄ emission rates, measured using mobile ground-based remote sensing methods, varied between 28.5 and 33.5 kg CH₄ h^-1, corresponding to an average emission factor of 5.9% as kg CH₄ (kg CH_4production) ^-1, whereas N₂O emissions varied between 4.0 and 6.4 kg h^-1, corresponding to an average emission factor of 1.5% as kg N₂O-N (kg TN _influent) ^-1. Plant-integrated NH₃ emissions were around 0.4 kg h^-1, corresponding to an average emission factor of 0.11% as kg NH₃-N (kg TN _removed) ^-1. On-site emission measurements showed that the largest proportions of CH₄ (70%) and NH₃ (66%) were emitted from the sludge treatment line (mainly biosolid stockpiles and the thickening and dewatering units), while most of the N₂O (82%) was emitted from nitrifying trickling filters. In addition to being the most important CH₄ source, stockpiles of biosolids exhibited different emissions when the sludge digesters were operated in series compared to in parallel, thus slightly increasing substrate retention time in the digesters. Lower CH₄ emissions and generally higher N₂O and NH₃ emissions were observed when the digesters were operated in series. Loading biosolids onto trucks for off-site treatment generally resulted in higher CH₄, N₂O, and NH₃ emissions from the biosolid stockpiles. On-site CH₄ and N₂O emission quantifications were approximately two-thirds of the plant-integrated emission quantifications, which may be explained by the different timeframes of the approaches and that not all emission sources were identified during on-site investigation. Off-site gas emission quantifications, using ground-based remote sensing methods, thus seem to provide more comprehensive total plant emissions rates, whereas on-site measurements provide insights into emissions from individual sources.

通过采用几种光学分析技术和测量方法，从瑞典废水处理厂对工厂综合和现场的气体排放进行了量化。使用移动地面遥感方法测得的工厂综合CH ₄排放率在28.5和33.5 kg CH ₄ h ^-1之间变化，相当于以CH ₄ kg计的平均排放因子5.9％（_产生4 CH ₄）^{- 1}，而N ₂ O排放量在4.0至6.4 kg h ^-1之间变化，相当于以kg N ₂ O-N（kg TN_流入量）^-1计的平均排放因子为1.5％。植物整合的NH ₃排放量约为0.4 kg h ^-1，相当于平均排放因子为0.11％（kg kg NH ₃ -N（kg TN_去除）^-1）。现场排放测量表明，最大的CH ₄（70％）和NH ₃（66％）从污泥处理线（主要是生物固体堆以及增稠和脱水装置）排放，而大部分N ₂ O （82％）是从硝化滴滤池中排出的。除了成为最重要的CH ₄来源，当污泥消化池串联运行时，与并联运行相比，生物固体库存展现出不同的排放量，因此略微增加了消化池中底物的保留时间。沼气池串联运行时，观察到较低的CH ₄排放量以及通常较高的N ₂ O和NH ₃排放量。将生物固体装载到卡车上进行异地处理通常会导致生物固体库存中CH ₄，N ₂ O和NH ₃排放量增加。现场CH ₄和N ₂O排放量的量化大约是工厂综合排放量量化的三分之二，这可能是由于方法的不同时限所致，而且并不是在现场调查中就确定了所有排放源。因此，使用基于地面的遥感方法进行的场外气体排放量化似乎可以提供更全面的工厂总排放率，而现场测量则可以洞察各个来源的排放。