Liu Tongshuai, Dong Hongmin, Zhu Zhiping, Shang Bin, Yin Fubin, Zhang Wanqin, Zhou Tanlong
a Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences , Beijing , People's Republic of China.
b Key Laboratory of Energy Conservation and Waste Treatment of Agricultural Structures, Ministry of Agriculture , Beijing , People's Republic of China.
J Air Waste Manag Assoc. 2017 Dec;67(12):1288-1297. doi: 10.1080/10962247.2017.1321591. Epub 2017 Apr 28.
Media depth (MD) and moisture content (MC) are two important factors that greatly influence biofilter performance. The purpose of this study was to investigate the combined effect of MC and MD on removing ammonia (NH), hydrogen sulfide (HS), and nitrous oxide (NO) from swine barns. Biofiltration performance of different MDs and MCs in combination based on a mixed medium of wood chips and compost was monitored. A 3 × 3 factorial design was adopted, which included three levels of the two factors (MC: 45%, 55%, and 67% [wet basis]; MD: 0.17, 0.33, and 0.50 m). Results indicated that high MC and MD could improve NH removal efficiency, but increase outlet NO concentration. When MC was 67%, the average NH removal efficiency of three MDs (0.17, 0.33, and, 0.50 m) ranged from 77.4% to 78.7%; the range of average HS removal efficiency dropped from 68.1-90.0% (1-34 days of the test period) to 36.8-63.7% (35-58 days of the test period); and the average outlet NO concentration increased by 25.5-60.1%. When MC was 55%, the average removal efficiency of NH, HS, and NO for treatment with 0.33 m MD was 72.8 ± 5.9%, 70.9 ± 13.3%, and -18.9 ± 8.1%, respectively; and the average removal efficiency of NH, HS, and NO for treatment with 0.50 m MD was 77.7 ± 4.2%, 65.8 ± 13.7%, and -24.5 ±12.1%, respectively. When MC was 45%, the highest average NH reduction efficiency among three MDs was 60.7% for 0.5 m MD, and the average NO removal efficiency for three MDs ranged from -18.8% to -12.7%. In addition, the pressure drop of 0.33 m MD was significantly lower than that of 0.50 m MD (p < 0.05). To obtain high mitigation of NH and HS and avoid elevated emission of NO and large pressure drop, 0.33 m MD at 55% MC is recommended.
The performances of biofilters with three different media depths (0.17, 0.33, and 0.50 m) and three different media moisture contents (45%, 55%, and 67% [wet basis]) were compared to remove gases from a swine barn. Using wood chips and compost mixture as the biofilters media, the combination of 0.33 m media depth and 55% media moisture content is recommended to obtain good reduction of NH and HS, and to simultaneously prevent elevated emission of NO and large pressure drop across the media.
介质深度（MD）和水分含量（MC）是极大影响生物滤池性能的两个重要因素。本研究的目的是调查MC和MD对去除猪舍中氨气（NH₃）、硫化氢（H₂S）和一氧化二氮（N₂O）的综合影响。基于木屑和堆肥的混合介质，监测了不同MD和MC组合的生物过滤性能。采用3×3析因设计，其中包括两个因素的三个水平（MC：45%、55%和67%[湿基]；MD：0.17、0.33和0.50 m）。结果表明，高MC和MD可提高NH₃去除效率，但会增加出口N₂O浓度。当MC为67%时，三种MD（0.17、0.33和0.50 m）的平均NH₃去除效率在77.4%至78.7%之间；平均H₂S去除效率范围从试验期1 - 34天的68.1 - 90.0%降至试验期35 - 58天的36.8 - 63.7%；平均出口N₂O浓度增加了25.5 - 60.1%。当MC为55%时，0.33 m MD处理的NH₃、H₂S和N₂O的平均去除效率分别为72.8±5.9%、70.9±13.3%和 - 18.9±8.1%；0.50 m MD处理的NH₃、H₂S和N₂O的平均去除效率分别为77.7±4.2%、65.8±13.7%和 - 24.5±12.1%。当MC为45%时，三种MD中最高的平均NH₃还原效率为0.5 m MD的60.7%，三种MD的平均N₂O去除效率在 - 18.8%至 - 12.7%之间。此外，0.33 m MD的压力降显著低于0.50 m MD（p < 0.05）。为实现对NH₃和H₂S的高效减排并避免N₂O排放增加和压力降过大，建议采用55% MC的0.33 m MD。
比较了三种不同介质深度（0.17、0.33和0.50 m）和三种不同介质水分含量（45%、55%和67%[湿基]）的生物滤池去除猪舍气体的性能。以木屑和堆肥混合物作为生物滤池介质，建议采用0.33 m的介质深度和55%的介质水分含量组合，以实现对NH₃和H₂S的良好减排，并同时防止N₂O排放增加以及介质上的压力降过大。
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