Dumont E, Hamon L, Lagadec S, Landrain P, Landrain B, Andrès Y
L'UNAM Université, École des Mines de Nantes, CNRS, GEPEA, UMR 6144, La Chantrerie, 4 rue Alfred Kastler, B.P. 20722, 44307 Nantes Cedex 3, France.
L'UNAM Université, École des Mines de Nantes, CNRS, GEPEA, UMR 6144, La Chantrerie, 4 rue Alfred Kastler, B.P. 20722, 44307 Nantes Cedex 3, France.
J Environ Manage. 2014 Jul 1;140:26-32. doi: 10.1016/j.jenvman.2014.03.008. Epub 2014 Apr 12.
An aboveground pilot-scale biofilter filled with wood chips was tested to treat ammonia emissions from a piggery located in Brittany (France). Two long-term tests ("summer" and "autumn" experiments) were carried out to improve biofilter applications for agriculture. The influence of climatic conditions on biofilter performance was taken into account. During summer 2012, the biofilter was operated for 74 days at different empty bed residence times (EBRTs) from 6 to 15 s. Inlet NH3 concentrations were relatively constant (around 15 mg m(-3)). Significant NH3 reductions were achieved at EBRT = 12 s (removal efficiencies, RE, ranged between 90 and 100% for loading rates, LR, of around 4 g m(-3) h(-1)). At a lower EBRT (6 s), RE dropped to roughly 30-50%. This was due to the dramatic increase in the loading rate (LR up to 12 g m(-3) h(-1)) but the results showed that the change in atmospheric conditions (temperature and relative humidity) also had a significant influence on biofilter performance. It was evidenced that the use of a humidifier upstream of the biofilter must be taken into account for large-scale biofilter design, but only for specific conditions (the spraying of the biofilter having to be carried out exceptionally). During autumn 2012, the biofilter was operated for 116 days at EBRT = 12 s. RE were around 80% for LR of around 3 g m(-3) h(-1). In such autumnal atmospheric conditions, a demister system should be installed upstream of the biofilter in order to avoid water accumulation in the bed material. Although biofiltration was suitable for NH3 treatment of piggery air, the need to control accurately the medium moisture content implies that biofilters would not be easily managed by a pig farmer.
对一个填充木屑的地上中试规模生物滤池进行了测试，以处理位于法国布列塔尼的一个养猪场的氨气排放。进行了两项长期测试（“夏季”和“秋季”实验），以改进生物滤池在农业中的应用。考虑了气候条件对生物滤池性能的影响。在2012年夏季，生物滤池在6至15秒的不同空床停留时间（EBRT）下运行了74天。入口氨气浓度相对恒定（约15毫克/立方米）。在EBRT = 12秒时实现了显著的氨气减排（去除效率，RE，对于约4克/立方米·小时的负荷率，LR，范围在90%至100%之间）。在较低的EBRT（6秒）时，RE降至约30 - 50%。这是由于负荷率急剧增加（LR高达12克/立方米·小时），但结果表明大气条件（温度和相对湿度）的变化也对生物滤池性能有显著影响。有证据表明，在大规模生物滤池设计中必须考虑在生物滤池上游使用加湿器，但仅适用于特定条件（生物滤池的喷雾必须特别进行）。在2012年秋季，生物滤池在EBRT = 12秒下运行了116天。对于约3克/立方米·小时的LR，RE约为80%。在这种秋季大气条件下，应在生物滤池上游安装除雾器系统，以避免床层材料中积水。尽管生物过滤适用于养猪场空气的氨气处理，但精确控制介质水分含量的需求意味着养猪户不易管理生物滤池。
