UV-A (ca. 365 nm wavelength, a.k.a. ‘black light’) photocatalysis has been investigated to comprehensively mitigate odor and selected air pollutants in the livestock environment. This study was conducted to confirm the performance of UV-A photocatalysis on the swine farm. The objectives of this research were to (1) scale-up of the UV-A photocatalysis treatment, (2) evaluate the mitigation of odorous gases from swine slurry pit, (3) test different UV sources, (4) evaluate the effect of particulate matter (PM) and (5) conduct preliminary economic analyses. We tested UV-A photocatalysis at a mobile laboratory-scale capable of treating ~0.2–0.8 m³·s⁻¹ of barn exhaust air. The targeted gaseous emissions of barn exhaust air were significantly mitigated (p < 0.05) up to 40% reduction of measured odor; 63%, 44%, 32%, 40%, 66% and 49% reduction of dimethyl disulfide, isobutyric acid, butanoic acid, p-cresol, indole and skatole, respectively; 40% reduction of H₂S; 100% reduction of O₃; and 13% reduction of N₂O. The PM mitigation effect was not significant. Formaldehyde levels did not change, and a 21% generation of CO₂ was observed. The percent reduction of targeted gases decreased as the airborne PM increased. Simultaneous chemical and sensory analysis confirmed that UV-A treatment changed the overall nuisance odor character of swine barn emissions into weaker manure odor with ‘toothpaste and ‘mint’ notes. The smell of benzoic acid generated in UV-A treatment was likely one of the compounds responsible for the less-offensive overall odor character of the UV-treated emissions. Results are needed to inform the design of a farm-scale trial, where the interior barn walls can be treated with the photocatalyst.

中文翻译：

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UV-A和UV-C光催化减轻猪舍的气味和气体排放

已对UV-A（约365 nm波长，又称“黑光”）光催化进行了研究，以全面减轻牲畜环境中的气味和选定的空气污染物。进行这项研究以确认在猪场中UV-A光催化的性能。这项研究的目的是（1）扩大UV-A光催化处理的规模；（2）评估缓解猪粪坑中有毒气体的能力；（3）测试不同的紫外线源；（4）评估以下效果：颗粒物（PM）和（5）进行了初步的经济分析。我们在能够处理约0.2–0.8 m ³ ·s ^-1谷仓废气的实验室规模的移动实验室中测试了UV-A光催化作用。显着降低了谷仓废气的目标气体排放量（p<0.05）最多可减少40％的气味; 二甲基二硫，异丁酸，丁酸，对甲酚，吲哚和粪臭素分别减少了63％，44％，32％，40％，66％和49％; H ₂ S减少40％；O ₃减少100％；的N减少13％₂ O的PM减轻效果不显著。甲醛水平未发生变化，产生了21％的CO ₂被观测到。随着空气中PM的增加，目标气体的减少百分比降低。同时进行的化学和感官分析证实，UV-A处理将猪舍排放物的总体讨厌气味特征变成了带有“牙膏和”薄荷味”的较弱的粪便气味。在UV-A处理中产生的苯甲酸气味可能是造成UV处理后排放物的低气味总体气味特征的化合物之一。需要结果来告知农场规模试验的设计，在该试验中，可以使用光催化剂处理谷仓内壁。