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首页> 外文期刊>Transactions of the ASABE >Process model for ammonia volatilization from anaerobic swine lagoons incorporating varying wind speeds and gas bubbling.
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Process model for ammonia volatilization from anaerobic swine lagoons incorporating varying wind speeds and gas bubbling.

机译：厌氧猪泻湖中氨挥发的过程模型，其中包括变化的风速和气体鼓泡。

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摘要

Ammonia volatilization from treatment lagoons varies widely with the total ammonia concentration, pH, temperature, suspended solids, atmospheric ammonia concentration above the water surface, and wind speed. Ammonia emissions were estimated with a process-based mechanistic model integrating ammonia chemistry of the lagoon and interfacial transport characteristics between air and water. This improved model incorporated the effect of internal bubble production and continuously variable wind speed on ammonia volatilization measured at 10 m above the liquid surface (U10). Model simulations were compared to ammonia emission rates measured simultaneously at three contrasting lagoon scenarios: non-treated lagoon (13,633 kg ha-1 year-1), partially pre-treated manure using solid-liquid separation (3,699 kg ha-1 year-1), and treated manure using combined solid-liquid separation with nitrogen and phosphorus removal from the liquid (1,311 kg ha-1 year-1). The simulations only using average U10 with bubble enhancement or U10 distributions without bubble enhancement produced fluxes 42 and 44% below observed fluxes, respectively. However, the simulated fluxes using the U10 distributions along with bubble enhancement for the non-treated lagoon during warm seasons closely matched the observed fluxes (y=1.04x, with R2=0.76). Ammonia emissions would be significantly underpredicted if bubbling-enhanced mass transport was not taken into account during warm seasons, as demonstrated by the improved process model and evidenced by the observed fluxes.
机译：处理池中的氨挥发随总氨浓度，pH，温度，悬浮固体，水面上方的大气氨浓度和风速变化很大。通过基于过程的机械模型估算氨气排放，该模型综合了泻湖的氨化学和空气与水之间的界面传输特性。这个改进的模型结合了内部气泡产生和连续可变风速对液面上方10 m处氨气挥发的影响（U10）。将模型模拟与在三种不同的泻湖情景下同时测量的氨排放速率进行比较：未处理的泻湖（13,633 kg ha-1 year-1），使用固液分离的部分预处理粪肥（3,699 kg ha-1 year-1） ），并采用固液分离相结合的方法处理粪肥，并从液体中除去氮和磷（1,311 kg ha-1 year-1）。仅使用具有气泡增强的平均U10或没有气泡增强的U10分布进行的模拟分别产生的通量比观察到的通量低42％和44％。但是，在暖季期间，使用未经处理的泻湖的U10分布模拟的通量以及气泡增强，与观测到的通量紧密匹配（y = 1.04x，R2 = 0.76）。如果改进的过程模型证明了这一点，并且观测到的通量证明了这一点，那么如果在温暖的季节不考虑提高起泡质量的话，氨的排放将被严重低估。

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