Dept. of Agricultural and Biosystems Engineering Iowa State University, Ames, IA 50011, USA.
Dept. of Agricultural and Biosystems Engineering Iowa State University, Ames, IA 50011, USA.
Chemosphere. 2019 Apr;221:778-784. doi: 10.1016/j.chemosphere.2019.01.086. Epub 2019 Jan 16.
Technologies for controlling gaseous emissions of livestock is of interest to producers, the public, and regulatory agencies. In our previous lab-scale study, the use of a photocatalytic coating on surfaces subjected to black ultraviolet light reduced emissions of key odorant compounds relevant to the livestock industry. Thus, an on-farm pilot-scale experiment was conducted at a commercial swine barn to evaluate a photocatalytic coating on surfaces subjected to ultraviolet light under field conditions. A flow-through reactor was constructed with a TiO-based photocatalytic coating on the interior surfaces and black ultraviolet light fixtures. The reactor was deployed in a room downstream of the entire swine barn exhaust. Gas samples were collected from three sampling ports in the reactor, one at the inlet (control), the midpoint (half treatment) and the outlet (treatment). Compared to the control, significant reductions in emissions were observed for p-cresol (22%), odor (16%) and nitrous oxide (9%). A significant increase in carbon dioxide (3%) was also measured. Results show that the TiO-based photocatalytic coating and black UV light are effective in mitigating odor, a key VOC responsible for downwind swine odor, and one important greenhouse effect gas when subjected to swine barn exhaust.
控制家畜气态排放的技术引起了生产者、公众和监管机构的关注。在我们之前的实验室规模研究中，在暴露于黑光的表面使用光催化涂层减少了与畜牧业相关的关键气味化合物的排放。因此，在一个商业养猪场进行了现场中试规模实验，以在现场条件下评估暴露于紫外光的表面的光催化涂层。构建了一个带有 TiO2 基光催化涂层的流通式反应器，并配备了黑色紫外光灯具。该反应器被部署在整个养猪场排气系统的下游房间内。从反应器的三个采样端口收集气体样品，一个在入口（对照）、中点（半处理）和出口（处理）。与对照相比，p-甲酚（22%）、气味（16%）和氧化亚氮（9%）的排放量显著减少。还测量到二氧化碳（3%）的显著增加。结果表明，TiO2 基光催化涂层和黑光对减轻气味有效，气味是导致下风处猪气味的关键 VOC 之一，也是猪舍废气中一种重要的温室效应气体。
