Biocover performance of landfill methane oxidation: Experimental results
Cabral, Alexandre; Moreira, Joao Fernandes; Jugnia, Louis-B.
Abstract: An experimental passive methane oxidation biocover (PMOB) was constructed within the existing final cover of the St-Nicéphore landfill. Its substrate consisted of a 0.80-m-thick mixture of sand and compost. The goal of this experiment was to evaluate the performance of the PMOB in reducing CH 4 CH4 emissions when submitted to an increasing methane load. The CH 4 CH4 load applied started with 9.3 g CH 4 m −2 d −1 9.3 g CH4 m−2 d−1 . When the site had to be closed for the winter, the CH 4 CH4 input was 820 g CH 4 m −2 d −1 820 g CH4 m−2 d−1 . Throughout the study, practically all the CH 4 CH4 input was oxidized; absolute removal rates were linearly correlated to methane loading; and the oxidation zone was established between 0.6–0.8 m. These results seem to indicate that the upper limit potential of this PMOB to oxidize CH 4 CH4 was not necessarily reached during the study period. Surface CH 4 CH4 concentration scans showed no signs of leaks. The substrate offered excellent conditions for the growth of methanotrophs, whose count averaged 3.91×10 8 CFU g dw −1 3.91×108 CFU g dw−1 soil.
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