Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA.
Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA.
J Environ Manage. 2017 Dec 15;204(Pt 1):136-143. doi: 10.1016/j.jenvman.2017.08.031. Epub 2017 Sep 3.
Hydrogen sulfide (HS) is a toxic air pollutant at animal facilities; but the understanding of its generation and emission processes has been limited. This paper studied HS emissions during a complete cycle of wean-finish pigs from a research building, where 12 pig rooms were divided into three groups that were fed with standard feed (control), and 2.1-3.8% (T) and 4.4-7.8% (T) reduced dietary crude protein (CP) feed. The group cycle mean HS emission rates were 4.0 ± 2.9, 4.3 ± 3.2, and 5.4 ± 4.0 g d AU (Animal Unit = 500 kg live mass), respectively, for the control, T, and T groups. Emissions of HS were promoted by 10.0 and 36.7%, respectively, for the T and T groups (p < 0.001), although large variabilities existed in the emissions from different rooms within the same groups. The enhanced HS emissions from the T and T groups were related to the reduced manure pH and were possibly affected through a number of pathways, which could involve volatile fatty acids and nitrogen concentrations, and microbial activities in manure.
硫化氢 (HS) 是动物设施中的一种有毒空气污染物；但其生成和排放过程的理解一直受到限制。本文研究了从研究楼中断奶到育肥猪的完整周期中 HS 的排放情况，该研究中 12 个猪圈被分为三组，分别饲喂标准饲料（对照）和 2.1-3.8%（T）和 4.4-7.8%（T）低蛋白日粮。对照组、T 组和 T 组的组循环平均 HS 排放率分别为 4.0 ± 2.9、4.3 ± 3.2 和 5.4 ± 4.0 g d AU（动物单位=500kg 活体质量）。T 组和 T 组的 HS 排放量分别增加了 10.0%和 36.7%（p < 0.001），尽管同一组内不同猪圈的排放量存在很大差异。T 组和 T 组中 HS 排放量的增加与粪尿 pH 值降低有关，可能通过多种途径受到影响，其中可能涉及挥发性脂肪酸和氮浓度以及粪尿中的微生物活性。
