Effect of bio-column composed of aged refuse on methane abatement--a novel configuration of biological oxidation in refuse landfill.
An experimental bio-column composed of aged refuse was installed around the exhaust pipe as a new way to mitigate methane in refuse landfill. One of the objectives of this work was to assess the effect of aged refuse thickness in bio-column on reducing CH4 emissions. Over the study period, methane oxidation was observed at various thicknesses, 5 cm (small size), 10 cm (middle size) and 15 cm (large size), representing one to three times of pipeline diameters. The middle and large size both showed over 90% methane conversion, and the highest methane conversion rate of above 95% occurred in the middle-size column cell. Michaelis-Menten equation addressed the methanotrophs diffusion in different layers of the bio-columns. Maximum methanotrophic activity (Vmax) measured at the three thicknesses ranged from 6.4 x 10(-3) to 15.6 x 10(-3) units, and the half-saturation value (K(M)) ranged from 0.85% to 1.67%. Both the highest Vmax and K(M) were observed at the middle-size of the bio-column, as well as the largest methanotrophs population, suggesting a significant efficiency of methane mitigation happened in the optimum zone with greatest affinity and methanotrophic bacteria activities. Therefore, bio-column is a potential style for methane abatement in landfill, and the aged refuse both naturally formed and artificially placed in the column plays a critical role in CH4 emission.
Han
Dan
D
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. 3824932@163.com
Zhao
Youcai
Y
Xue
Binjie
B
Chai
Xiaoli
X
D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D002245:Carbon Dioxide / Q000032:analysis; D017753:Ecosystem; D007700:Kinetics; D008697:Methane / Q000032:analysis*; D010084:Oxidation-Reduction; D012037:Refuse Disposal / Q000295:instrumentation*; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D008697:Methane