Distribution of particle and gas concentrations in Swine gestation confined animal feeding operations.
Distribution of particle and gas concentrations in Swine gestation confined animal feeding operations.
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猪妊娠限制动物饲养操作中颗粒和气体浓度的分布。
DOI：
10.1093/annhyg/mes050
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
O'Shaughnessy,PatrickT
中科院分区：
文献类型：
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作者：
Peters,ThomasM;Anthony,TRenée;Taylor,Craig;Altmaier,Ralph;Anderson,Kimberley;O'Shaughnessy,PatrickT
目的绘制了一个现代化的、有1048个围栏的猪舍在冬季、春季和夏季的粉尘质量浓度、温度和二氧化碳浓度图。方法在每个季节，两名技术人员使用气溶胶测光仪测量可呼吸质量浓度，并使用室内空气质量监测仪在牛舍的60个位置测量温度和二氧化碳浓度。结果冬季，当建筑通风较低(中心-谷仓平均风速=0.34m S−1，68fpm)时，谷仓内的质量和二氧化碳浓度最高(质量几何平均值，Gm=0.50mgm−3；CO2 Gm=2060ppm)，空间分布较均匀(质量几何标准差，GSD=1.48；CO2GSD=1.24)。浓度在夏季最低(质量Gm=0.13mgm−3；CO2Gm=610ppm)，提供降温的通风率高(中心谷仓平均风速=0.99m S−1,196fpm)。空间梯度在春季最大(质量GSD=2.11；CO2GSD=1.50)，在建筑物进水口附近观测到较低的浓度，在建筑物排气口处增加到较高浓度。光度计测得的质量浓度与二氧化碳浓度的对数之间存在较强的线性关系(R2=0.60)，这表明二氧化碳可能是评价猪舍空气质量的一种廉价的替代方法。这些结果表明，通风除可以控制温度外，还可以有效地降低污染物水平。
ObjectivesDust mass concentrations, temperatures, and carbon dioxide concentrations were mapped in a modern, 1048-pen swine gestation barn in winter, spring, and summer.MethodsIn each season, two technicians measured respirable mass concentrations with an aerosol photometer and temperatures and carbon dioxide concentrations with an indoor air quality monitor at 60 positions in the barn. Stationary photometers were also deployed to measure mass concentrations during mapping at five fixed locations.ResultsIn winter when building ventilation rates were low (center–barn mean air velocity = 0.34 m s−1, 68 fpm) to conserve heat within the barn, mass and carbon dioxide concentrations were highest (mass geometric mean, GM = 0.50mg m−3; CO2GM = 2060 ppm) and fairly uniform over space (mass geometric standard deviation, GSD = 1.48; CO2GSD = 1.24). Concentrations were lowest in summer (mass GM = 0.13mg m−3; CO2GM = 610 ppm) when ventilation rates were high (center–barn mean air velocity = 0.99 m s−1, 196 fpm) to provide cooling. Spatial gradients were greatest in spring (mass GSD = 2.11; CO2GSD = 1.50) with low concentrations observed near the building intake, increasing to higher concentrations at the building exhaust.ConclusionsMass concentrations obtained in mapping were generally consistent with those obtained from stationary monitors. A moderately strong linear relationship (R2= 0.60) was observed between the log of photometer-measured mass concentration and the log of carbon dioxide concentration, suggesting that carbon dioxide may be an inexpensive alternative to assessing air quality in a swine barn. These results indicate that ventilation can effectively reduce contaminant levels in addition to controlling temperature.