Aarhus University, Dept. of Biological and Chemical Engineering, Denmark.
Aarhus University, Dept. of Biological and Chemical Engineering, Denmark.
J Environ Manage. 2022 May 15;310:114756. doi: 10.1016/j.jenvman.2022.114756. Epub 2022 Feb 23.
Land spreading of liquid animal manure (slurry) is a major source of atmospheric emissions. Ammonia (NH) emission is of concern, as it is one of the main contributors to ambient air pollution and nitrogen deposition. Storage and field acidification of the slurry prior to application is used to mitigate NH emission, but the effect of acidification on emissions of odorous non-methane volatile organic compounds (NMVOC) has not been investigated, and there is a scarcity of data investigating the effect of field acidification. Four field experiments, two with cattle slurry and two with pig slurry, were performed. Ammonia and NMVOC emissions were measured simultaneously in a system of dynamic chambers and online measurements by cavity ring-down spectroscopy (CRDS) and proton-transfer-reaction mass spectrometry (PTR-MS). The system allowed for a high time resolution and low variation. All four experiments were performed under cold conditions (<10°C average temperature). Storage and field acidification significantly lowered the NH emission by 79 ± 18% and 30 ± 6% on average, respectively. The NMVOC cumulative emission increased by 202 ± 133% and 17 ± 16% on average after storage and field acidification, respectively, even if the increase was only significant for storage acidification. Storage acidification significantly increased the emissions of odour at most measuring times. The increases of cumulative NMVOC emissions and odour was primarily caused by higher emissions of volatile fatty acids.
土地施撒液态动物粪便（粪浆）是大气排放的主要来源之一。氨气（NH）排放是一个值得关注的问题，因为它是造成环境空气污染和氮沉积的主要因素之一。在施撒之前对粪浆进行存储和田间酸化处理可用于减少 NH 排放，但酸化处理对恶臭非甲烷挥发性有机化合物（NMVOC）排放的影响尚未得到研究，而且缺乏调查田间酸化处理效果的数据。进行了四项田间实验，其中两项使用牛粪浆，两项使用猪粪浆。通过动态腔室和腔衰荡光谱（CRDS）和质子转移反应质谱（PTR-MS）的在线测量同时测量氨和 NMVOC 排放。该系统允许进行高时间分辨率和低变化的测量。所有四项实验均在低温条件下（平均温度<10°C）进行。存储和田间酸化处理分别平均将 NH 排放降低了 79±18%和 30±6%。存储和田间酸化处理后，NMVOC 的累积排放量分别平均增加了 202±133%和 17±16%，尽管仅存储酸化处理的增加具有统计学意义。存储酸化处理在大多数测量时间显著增加了气味排放。累积 NMVOC 排放和气味的增加主要是由于挥发性脂肪酸排放增加所致。
