Low frequency aeration of slurries may reduce ammonia (NH3) and methane (CH4) emissions without increasing nitrous oxide (N2O) emissions. The aim of this study was to quantify this potential reduction and to establish the underlying mechanisms. A batch experiment was designed with 6 tanks with 1 m3 of pig slurry each. After an initial phase of 7 days when none of the tanks were aerated, a second phase of 4 weeks subjected three of the tanks to aeration (2 min every 6 h, airflow 10 m3 h−1), whereas the other three tanks remained as a control. A final phase of 9 days was established with no aeration in any tank. Emissions of NH3, CH4, carbon dioxide (CO2) and N2O were measured. In the initial phase no differences in emissions were detected, but during the second phase aeration increased NH3 emissions by 20% with respect to the controls (8.48 vs. 7.07 g m−3 [slurry] d−1, P < 0.05). A higher pH was found in the aerated tanks at the end of this phase (7.7 vs. 7.0 in the aerated and control tanks, respectively, P < 0.05). CH4 emissions were 40% lower in the aerated tanks (2.04 vs. 3.39 g m−3 [slurry] d−1, P < 0.05). These differences in NH3 and CH4 emissions remained after the aeration phase had finished. No effect was detected for CO2, and no relevant N2O emissions were detected during the experiment. Our results demonstrate that low frequency aeration of stored pig slurry increases slurry pH and increases NH3 emissions.

中文翻译：

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猪泥浆的低频曝气会影响泥浆特性以及温室气体和氨的排放

浆液的低频曝气可以减少氨 (NH3) 和甲烷 (CH4) 的排放，而不会增加一氧化二氮 (N2O) 的排放。这项研究的目的是量化这种潜在的减少并建立潜在的机制。批量试验设计有 6 个罐，每个罐装有 1 立方米的猪粪。经过 7 天的初始阶段，没有一个水箱被曝气，4 周的第二阶段对三个水箱进行充气（每 6 小时 2 分钟，气流 10 m3 h-1），而其他三个水箱保持不变一个控制。建立了 9 天的最后阶段，在任何罐中都没有曝气。测量了 NH3、CH4、二氧化碳 (CO2) 和 N2O 的排放量。在初始阶段未检测到排放差异，但在第二阶段，曝气使 NH3 排放量比对照增加了 20%（8.48 对 7. 07 gm-3 [浆液] d-1，P < 0.05)。在该阶段结束时，曝气池中的 pH 值较高（曝气池和对照池分别为 7.7 和 7.0，P < 0.05）。充气罐中的 CH4 排放量降低了 40%（2.04 与 3.39 gm-3 [泥浆] d-1，P < 0.05）。在曝气阶段结束后，NH3 和 CH4 排放的这些差异仍然存在。未检测到 CO2 的影响，并且在实验期间未检测到相关的 N2O 排放。我们的结果表明，对储存的猪粪进行低频曝气会增加淤浆的 pH 值并增加 NH3 排放。0.05）。在曝气阶段结束后，NH3 和 CH4 排放的这些差异仍然存在。未检测到 CO2 的影响，并且在实验期间未检测到相关的 N2O 排放。我们的结果表明，对储存的猪粪进行低频曝气会增加淤浆的 pH 值并增加 NH3 排放。0.05）。在曝气阶段结束后，NH3 和 CH4 排放的这些差异仍然存在。未检测到 CO2 的影响，并且在实验期间未检测到相关的 N2O 排放。我们的结果表明，对储存的猪粪进行低频曝气会增加粪浆的 pH 值并增加 NH3 排放。