Comparison of the methane oxidation rate in four media

Abstract

Comparison of the methane oxidation rate in four media aBstraCt Landfill gas emissions are one of the main sources of anthropogenic methane (Ch 4 ), a major greenhouse gas. in this paper, an economically attractive alternative to minimize greenhouse gas emissions from municipal solid waste landfills was sought. this alternative consists in special biofilters as landfill covers with oxidative capacity in the presence of Ch 4 . to improve the quality/ cost ratio of the project, compost was chosen as one of the cover substrates and soil (typic red yellow-silt-clay podzolic) as the other. the performance of four substrates was studied in laboratory experiments: municipal solid waste (msW) compost, soil, and two soil-compost at different proportions. this study aimed to evaluate the suitability and environmental compatibility as a means of Ch 4 oxidation in biofilters. four biofilters were constructed in 60 cm pVC tubes with an internal diameter of 10 cm. each filter contained 2.3 L of oxidizing substrate at the beginning of the experiment. the gas used was a mixture of Ch 4 and air introduced at the bottom of each biofilter, at a flow of 150 mL min -1 , by a flow meter. one hundred days after the beginning of the experiment, the best biofilter was the msW compost with an oxidation rate of 990 g m -3 day -1 , corresponding to an efficiency of 44 %. it can be concluded that the four substrates studied have satisfactory oxidative capacity, and the substrates can be used advantageously as cover substrate of msW landfills. index terms: methane oxidation, biofilter, municipal solid waste compost, solid waste landfill cover, case study.(1) part of the doctoral thesis of first author submitted to the federal university of rio de Janeiro (ufrJ). research financed by Cnpq, Capes e faperJ.

Treatment of landfill gas with low methane content by biocover systems

“…However, other previous studies using diluted LFG, as e.g. Amodeo et al (2015), Rose et al (2012) and Girad et al (2011) treated with low retention times (maximum 9 minutes) did not find as high oxidation efficiencies as in our experiment, suggesting that there is a minimum limit for when the retention time affects the CH4 oxidation efficiency and thus the oxidation rates. Table 4.…”

Fugitive Methane Emissions From Two Experimental Biocovers Constructed With Tropical Residual Soils: Field Study Using a Large Flux Chamber

“…For example, Abichou et al (2009) reported maximum methane efficiency equal to 63% for the control subarea in a landfill in Florida, while in the biocover it was 100%. Rose et al (2012) obtained a maximum CH 4 oxidation efficiency of 67% for a conventional cover layer, while improving it with compost led to a maximum of 97%. Capanema et al (2013) found a methane oxidation efficiency of 95.8% in a biocover whose O.M.…”

Methane oxidation potential of boreal landfill cover materials: The governing factors and enhancement by nutrient manipulation

“…Thus, the methanotrophs would be benefitting directly from the activity of heterotrophs. On the other hand, as discussed earlier, BR acts as an indicator of the stage of mineralisation and physical structure of the soil material (Mor et al, 2006;Rose et al, 2012). Therefore, it could be used as an indirect indicator of the suitability of the soil material for methanotrophic and other bacterial activity.…”

“…nutrient content, specific surface area and air-filled porosity of compost (Huber-Humer et al, 2009). In addition, the finer texture of the soil material causes compaction of the structure and, consequently, retardation of the gas transfer between soil and atmosphere (Rose et al, 2012;Tanthachoon et al, 2008). The reduction in the size of soil particles in the course of time is caused by biological degradation processes (Scheutz et al, 2009).…”