Evaluating Methane Oxidation Efficiencies in Experimental Landfill Biocovers by Mass Balance and Carbon Stable Isotopes

Capanema, Marlon André; Cabral, Alexandre R.

doi:10.1007/s11270-012-1302-6

Cited by 21 publications

(13 citation statements)

References 38 publications

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“…The in uence of variation in the methane loading rate on the methane removal e ciency was veri ed in this study. Considering that: (a) we found no registers concerning the values for methane loading rates as applied to cover layers in Brazilian land lls; (b) the average methane loading rates applied to cover layers in land lls in the USA and Canada with gas collection systems are 28 g CH4 .m -2 .d -1 [35]; and (c) the loading rate exerted under the cover layer in land lls with no active biogas collection system (as in the land ll evaluated) can vary greatly, and can be higher than those exerted in land lls with collection systems; considering these premises, the authors judged it reasonable to adopt inlet methane loading rates of @22 g CH4 .m -2 .d -1 (loading 1, with 13 campaigns) and @44 g CH4 .m -2 .d -1 (loading 2, with 12 campaigns), under standard temperature and pressure (STP) conditions. Before starting a monitoring period, biogas was injected into the two bio lters during 40 days with a loading rate of @22 g CH4 .m -2 .d -1 to allow acclimatation of the methanotrophic population.…”

Section: Monitoring and Performance Of The Bio Ltersmentioning

confidence: 78%

“…In addition, the mass transfer of methane at the gas-liquid interface is also affected by the low solubility of methane in the aqueous medium [23,51,53,58,60]. Thus, even though the maximum loading rates reported in the literature (and hence the biotreatment e ciency) may vary considerably as a function of the system characteristics and operational conditions [6, 57, 61, 62], reduced loading rates (or elevated residence times) can favour methane oxidation in bio-based cover systems [18,35], as observed in the present study. The parameter "loading rate" was also signi cant for methane oxidation e ciency, and for loading rate 1…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the heat of the raw biogas supplied to the two columns as from the vertical drain added to the exothermicity of the system, which can lead to a considerable increase in the lter bed temperature [6]. Many studies have indicated a strong correlation between oxidation e ciency and the temperature of the medium [19,24,26,35,36]. Most of these studies reported an increase in methane removal e ciency with increase in temperature of the medium, and, similarly, a reduction in removal e ciency with decrease in temperature, mentioning temperatures in the range from 25-35ºC to obtain optimal methane oxidation e ciency in different soil types [19,59].…”

Section: C: Control Column E: Enriched Columnmentioning

confidence: 99%

“…Many papers have reported a strong correlation between oxidation e ciency and temperature [19,26,35,36]. Although the majority of these studies have found a tendency to increase the methane removal e ciency with increase in temperature of the medium, and, in the same way, a reduction in the removal e ciency with a decrease in temperature, this behaviour cannot be considered as a rule.…”

Section: Introductionmentioning

confidence: 99%

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Biofiltration of Methane Fugitive Emissions from Landfills Using Scum from Municipal Wastewater Treatment Plants (Wwtp) as Alternative Substrate

Schirmer

Stroparo

Capanema

et al. 2021

Preprint

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Biofilters have been recognized as key technology in the mitigation of greenhouse gases (GHG) emitted by landfills. This study aimed to evaluate the methane (an important GHG) oxidation efficiencies of two experimental biofilters at the municipal landfill of Guarapuava (Brazil) under normal conditions (control column), just using landfill cover soil with low organic matter content, and improved, exploiting dried scum from municipal wastewater treatment plant (SWWTP) mixed with the cover soil (enriched column, with a high organic matter content). The influence of parameters such as the methane inlet loading rates (22 and 44 gCH4.m− 2.d− 1), temperatures, methane concentration in the raw biogas, carbon/nitrogen ratio and moisture content of the packing materials on the oxidation of methane was also evaluated during 25 campaigns. The campaigns with the lowest methane loading rates applied to the biofilters showed the best methane oxidation efficiencies (98.4% and 89.5% in the enriched and control columns, respectively) as compared to campaigns with a higher load (92.6% and 82.6% in the enriched and control columns, respectively). In addition to the loading rates, the methane oxidation efficiencies were highly influenced by the organic matter content and C/N ratio of the packing materials evaluated.

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Section: Monitoring and Performance Of The Bio Ltersmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: C: Control Column E: Enriched Columnmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biofiltration of Methane Fugitive Emissions from Landfills Using Scum from Municipal Wastewater Treatment Plants (Wwtp) as Alternative Substrate

Schirmer

Stroparo

Capanema

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The lowest oxidation rate was 180 g CH 4 /m 2 /d, which was obtained for the WC column at the end of test 4. This oxidation rate is nonetheless very high considering that it far exceeds what is considered the average methane loading applied to cover systems, in several landfills with gas collection systems in the U.S. and Canada, i.e., 28 g CH 4 /m 2 /d (Capanema and Cabral, 2012).…”

Section: Methane Oxidation Efficiencies Under Laboratory Conditionsmentioning

confidence: 98%

Does vegetation affect the methane oxidation efficiency of passive biosystems?

2015

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It is often reported in the technical literature that the presence of vegetation improves the methane oxidation efficiency of biosystems; however, the phenomena involved and biosystem performance results are still poorly documented, particularly in the field. This triggered a study to assess the importance of vegetation in methane oxidation efficiency (MOE). In this study, 4 large scale columns, each filled with sand, topsoil and a mixture of compost and topsoil were tested under controlled conditions in the laboratory and partially controlled conditions in the field. Four series of laboratory tests and two series of field tests were performed. 4 different plant covers were tested for each series: Trifolium repens L. (White clover), Phleum pratense L. (Timothy grass), a mixture of both, and bare soil as the control biosystem. The study results indicated that up to a loading equal to 100 g CH4/m(2)/d, the type of plant cover did not influence the oxidation rates, and the MOE was quite high (⩾ 95%) in all columns. Beyond this point, the oxidation rate continued to increase, reaching 253 and 179 g CH4/m(2)/d in laboratory and field tests respectively. In the end, the bare soil achieved as high or higher MOEs than vegetated biosystems. Despite the fact that the findings of this study cannot be generalized to other types of biosystems and plants and that the vegetation types tested were not fully grown, it was shown that for the short-term tests performed and the types of substrates and plants used herein, vegetation does not seem to be a key factor for enhancing biosystem performance. This key conclusion does not corroborate the conclusion of the relatively few studies published in the technical literature assessing the importance of vegetation in MOE.

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Elements of Design of Passive Methane Oxidation Biosystems: Fundamental and Practical Considerations About Compaction and Hydraulic Characteristics on Biogas Migration

2018

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Passive methane oxidation biosystems (PMOBs) are often proposed as a means to reduce fugitive landfill CH4 emissions, i.e. emissions not captured by gas collection systems.However, current designs may lead to the formation of a capillary barrier along the interface between the two main layers constituting passive biosystems, namely the methane oxidation layer and gas distribution layer. The formation of a capillary barrier may result in restricted upward flow of biogas at the base of methane oxidation layer, thereby leading to concentrated biogas emissions in regions known as hotpots, where passive oxidation of biotic methane is failing, if not absent. In this study, design criteria are introduced to assess the ease of biogas flow across the gas distribution-methane oxidation layers' interface. Laboratory experiments were conducted to obtain the water retention curve, air permeability function and line of optima (on Standard Proctor curve) of the materials used to construct the methane oxidation layer of two experimental PMOBs at the St-Nicephore (Quebec, Canada) landfill. In addition, the main characteristics for other materials were obtained from the literature. Design criteria were then defined based on the degree of water saturation at the lines of optima and the pattern of air permeability functions and water retention curves. Considering these criteria in the design of PMOBs is fundamental to reduce the risk of creating hotspots when implementing PMOBs.

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Evaluating Methane Oxidation Efficiencies in Experimental Landfill Biocovers by Mass Balance and Carbon Stable Isotopes

Cited by 21 publications

References 38 publications

Biofiltration of Methane Fugitive Emissions from Landfills Using Scum from Municipal Wastewater Treatment Plants (Wwtp) as Alternative Substrate

Biofiltration of Methane Fugitive Emissions from Landfills Using Scum from Municipal Wastewater Treatment Plants (Wwtp) as Alternative Substrate

Does vegetation affect the methane oxidation efficiency of passive biosystems?

Elements of Design of Passive Methane Oxidation Biosystems: Fundamental and Practical Considerations About Compaction and Hydraulic Characteristics on Biogas Migration

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