The effects of nitrogen source and phosphorus concentration on bioconversion of low concentration methane were analyzed in a biofiltration system. Ceramic Pall ring was used as the packing material and air/pure methane gas mixtures were used to simulate coal mine ventilation air methane (VAM). A biotrickling filter was inoculated with methanotrophic bacteria which had high methane bio-oxidation efficiency. The biotrickling filter (BTF) was operated at conditions of gas flow rate 2 L⋅min−1, nitrate salts medium (NSM) nutrient solution spray rate 0.1 L⋅min−1, inlet methane concentration 0.1%~1.1%. When the nitrogen source in NSM is NaNO3, the methane elimination capacity (ECMet) is higher than (NH4)2SO4and NH4NO3. The optimum condition is NaNO3 concentration 70 mmol⋅L−1, inlet methane 0.1%~1.1% which corresponds to an ECMet of 10.67~39.72 g⋅m−3⋅h−1.ECMet increases with inlet methane concentration but methane removal efficiency (REMet) decreases from 97.92% to 39.70% with the increase of inlet methane. The best BTF performance was obtained with NaNO3 70 mmol⋅L−1, P 100 mmol⋅L−1 and inlet methane concentration 0.9%, with maximumECMet andREMet values of 49.69 g⋅m−3⋅h−1 and 60.90%, respectively.%研究了氮源类型和浓度以及磷元素浓度对生物滴滤塔净化极低浓度CH 4的影响。利用空气和高纯CH 4混合气模拟煤矿乏风瓦斯，生物滴滤塔填料为陶瓷鲍尔环，以实验室分离筛选到的甲烷氧化菌进行接种挂膜。结果表明，进气流量为2 L⋅min−1，喷淋液流量为0.1 L⋅min−1，进气CH4浓度在0.1%~1.1%，以NaNO3为氮源时，生物滴滤塔净化CH4的效果最好，优于(NH4)2SO4和NH4NO3为氮源时的表现。喷淋液中NaNO3浓度为70 mmol⋅L−1，进气CH4浓度为0.1%~1.1%时，生物滴滤塔的CH4去除负荷为10.67~39.72 g⋅m−3⋅h−1，去除负荷随CH4浓度增加而增加；CH4净化率为97.92%~39.70%，净化率随CH4浓度增加而下降。在最佳氮源条件下，进气CH4浓度为0.9%，P元素浓度为100 mmol⋅L−1时，滴滤塔CH4去除负荷最大为49.69 g⋅m−3⋅h−1，CH4净化率60.90%。
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