Biofiltration of methane from cow barns: Effects of climatic conditions and packing bed media acclimatization.

摘要: Abstract The performance of biofiltration to mitigate CH4 emissions from cow barns was investigated in the laboratory using two flow-through columns constructed with an acclimatized packed bed media composed inexpensive materials and readily available agricultural context. biofilters were fed artificial exhaust gas at a constant rate 0.036 m3 h−1 low inlet concentration (0.22 g m−3 = 300 ppm). empty-bed residence time (EBRT) equal 0.21 h. Additionally, order simulate temperature changes under natural conditions determine influence such cycles on removal efficiency, upper part submitted oscillations over time. maximum oxidation (1.68 μg gdw−1h−1) obtained commercial compost mixed straw. Accordingly, it considered as packing for biofilters. efficiency affected by prevailing within biofilters, way which cooling-warming applied acclimatization process. shorter cycles, more rates varied. With longer stabilized efficiencies attained nearly 100% both remained this level than 100 days, irrespective top biofilter, – times adverse microbiological activity. first kinetics entire system estimated 15 h−1. If could be transposed real field Canada, home 945,000 dairy cows, may efficiently abate between 2 × 106 3 × 106 t yr−1 CO2 equivalent (depending how estimates are performed) bovine enteric fermentation alone.