Lee Myeongseong, Li Peiyang, Koziel Jacek A, Ahn Heekwon, Wi Jisoo, Chen Baitong, Meiirkhanuly Zhanibek, Banik Chumki, Jenks William S
Department of Animal Biosystems Sciences, Chungnam National University, Daejeon, South Korea.
Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, IA, United States.
Front Chem. 2020 Jul 31;8:613. doi: 10.3389/fchem.2020.00613. eCollection 2020.
Poultry farmers are producing eggs, meat, and feathers with increased efficiency and lower carbon footprint. Technologies to address concerns about the indoor air quality inside barns and the gaseous emissions from farms to the atmosphere continue to be among industry priorities. We have been developing and scaling up a UV air treatment that has the potential to reduce odor and other gases on the farm scale. In our recent laboratory-scale study, the use of UV-A (a less toxic ultraviolet light, a.k.a. "black light") and a special TiO-based photocatalyst reduced concentrations of several important air pollutants (NH, CO, NO, O) without impact on HS and CH. Therefore, the objectives of this research were to (1) scale up the UV treatment to pilot scale, (2) evaluate the mitigation of odor and odorous volatile organic compounds (VOCs), and (3) complete preliminary economic analyses. A pilot-scale experiment was conducted under commercial poultry barn conditions to evaluate photocatalyst coatings on surfaces subjected to UV light under field conditions. In this study, the reactor was constructed to support interchangeable wall panels and installed on a poultry farm. The effects of a photocatalyst's presence (photocatalysis and photolysis), UV intensity (LED and fluorescent), and treatment time were studied in the pilot-scale experiments inside a poultry barn. The results of the pilot-scale experiments were consistent with the laboratory-scale one: the percent reduction under photocatalysis was generally higher than photolysis. In addition, the percent reduction of target gases at a high light intensity and long treatment time was higher. The percent reduction of NH was 5-9%. There was no impact on HS, CH, and CO under any experimental conditions. NO and O concentrations were reduced at 6-12% and 87-100% by both photolysis and photocatalysis. In addition, concentrations of several VOCs responsible for livestock odor were reduced from 26 to 62% and increased with treatment time and light intensity. The odor was reduced by 18%. Photolysis treatment reduced concentrations of NO, VOCs, and O, only. The initial economic analysis has shown that LEDs are more efficient than fluorescent lights. Further scale-up and research at farm scale are warranted.
家禽养殖户正在以更高的效率和更低的碳足迹生产鸡蛋、肉类和羽毛。解决禽舍内空气质量问题以及农场向大气排放气体的技术仍然是行业优先事项。我们一直在开发和扩大一种紫外线空气处理技术，该技术有可能在农场规模上减少异味和其他气体。在我们最近的实验室规模研究中，使用紫外线A（一种毒性较小的紫外线，也称为“黑光”）和一种特殊的基于二氧化钛的光催化剂降低了几种重要空气污染物（氨气、一氧化碳、一氧化氮、臭氧）的浓度，而对硫化氢和甲烷没有影响。因此，本研究的目的是：（1）将紫外线处理扩大到中试规模；（2）评估异味和有气味的挥发性有机化合物（VOCs）的减轻情况；（3）完成初步经济分析。在商业家禽舍条件下进行了中试规模实验，以评估在现场条件下接受紫外线照射的表面上的光催化剂涂层。在本研究中，反应器被构建为支持可互换墙板，并安装在一个家禽养殖场。在禽舍内的中试规模实验中研究了光催化剂的存在（光催化和光解）、紫外线强度（发光二极管和荧光灯）和处理时间的影响。中试规模实验的结果与实验室规模实验一致：光催化下的减少百分比通常高于光解。此外，在高光强度和长处理时间下目标气体的减少百分比更高。氨气的减少百分比为5-9%。在任何实验条件下，对硫化氢、甲烷和一氧化碳都没有影响。通过光解和光催化，一氧化氮和臭氧浓度分别降低了6-12%和87-100%。此外，几种导致牲畜异味的挥发性有机化合物的浓度降低了26%至62%，并随着处理时间和光强度的增加而增加。异味减少了18%。光解处理仅降低了一氧化氮、挥发性有机化合物和臭氧的浓度。初步经济分析表明，发光二极管比荧光灯更高效。有必要在农场规模上进一步扩大规模并开展研究。
