Aerated biofilters with multiple-level air injection configurations to enhance biological treatment of methane emissions

Farrokhzadeh, Hasti; Hettiaratchi, J. Patrick A.; Jayasinghe, Poornima; Kumar, Sunil

doi:10.1016/j.biortech.2017.05.009

Cited by 26 publications

(14 citation statements)

References 27 publications

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“…The oxidation efficiency with decreasing depth goes from 30% to 60% due to the high entry of atmospheric oxygen into the pores of the filter bed in the surface layers. As confirmed by some authors, O 2 is important for the oxidation of CH 4 , and a few studies have investigated actively aerated biofilters (mainly as lab-scale column tests), some with separate air injection at multiple levels [44] and some with CH 4 and ambient air or O 2 mixed in the inlet, thereby simulating diluted LFG [18,22,45,46]. Therefore, according to Scheutz et al (2009) [47], an oxygen concentration of less than 1% causes a total inhibition of the methanotrophic bacterial flora, while values between 1%-3% cause a reduced biological oxidation activity in methane.…”

Section: Surface Lfg Emissionmentioning

confidence: 93%

Mitigation of Methane, NMVOCs and Odor Emissions in Active and Passive Biofiltration Systems at Municipal Solid Waste Landfills

2020

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Biofiltration systems are emerging technological solutions for the removal of methane and odors from landfill gas when flaring is no longer feasible. This work analyzed and compared two full-scale biofiltration systems: biofilter and biowindows. The emission mitigation of methane, non-methane volatile organic compounds (NMVOCs) and odors during a two-year management and monitoring period was studied. In addition to diluted methane, more than 50 NMVOCs have been detected in the inlet raw landfill gas and the sulfur compounds resulted in the highest odor activity value. Both systems, biofilter and biowindows, were effective for the oxidation of methane (58.1% and 88.05%, respectively), for the mitigation of NMVOCs (higher than 80%) and odor reduction (99.84% and 93.82% respectively). As for the biofilter monitoring, it was possible to define the oxidation efficiency trend and in fact to guarantee that for an oxidation efficiency of 80%, the methane load must be less than 6.5 g CH4/m2h with an oxidation rate of 5.2 g CH4/m2h.

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Section: Surface Lfg Emissionmentioning

confidence: 93%

Mitigation of Methane, NMVOCs and Odor Emissions in Active and Passive Biofiltration Systems at Municipal Solid Waste Landfills

2020

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“…The use of a biofilter for treating LFG (with a CH4 concentration of about 30 % v/v) by adding atmospheric air to the biofilter at three locations along the height of the biofilter was previous studied by Haubrichs and Widmann, (2006). A similar study was made by Farrokhzadeh et al(2017) also with air injection at up to three locations along the height of the filter. Both biofilters were closed to the atmosphere avoiding diffusion of O2 from above.…”

Section: Introductionmentioning

confidence: 99%

Treatment of landfill gas with low methane content by biocover systems

2019

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Landfills are significant sources of anthropogenic atmospheric methane (CH4), which contributes to climate change. Large amounts of CH4 are emitted from landfills in dilute form due to mixing with air in leachate collection systems, or during lateral migration away from landfills. The objective of this study was to investigate the CH4 oxidation efficiency of a compost material subject to LFG diluted with atmospheric air resulting in CH4 concentrations of 5-10 % v/v.. CH4 oxidation rates and carbon dioxide (CO2) production were measured through batch and dynamic column experiments where two laboratory scale biofilters were constructed. The columns were run at increasing flow rates. Column gas concentration profiles for each of five flow campaigns were compared to each other. This showed that oxygen (O2) was present through the entire column and elevated CO2 concentrations throughout the biofilters were found. Moreover, the oxidation process tended to be centred in the lower parts of both columns. It was observed that the biofilters performed better once they had adapted to the increasing loads of CH4. In both columns, the maximum removal rate of CH4 was found to be 98-100 %. Using CH4 mass balances the maximum oxidation rate was 238 g CH4 m-2 d-1 in Column 1 and 483 g CH4 m-2 d-1 in Column 2 (equal to the load). None of the biofilters reached their maximum CH4 oxidation capacity, hence they could have been exposed to a larger CH4 load. It was found that the retention time in the columns was not a factor limiting the oxidation process. High O2 consumption and carbon mass balances underlined the strong activity in the biofilters and it was not suspected that the methane oxidising bacteria were O2 limited. The results of this study suggest that biofilters have great potential for reducing CH4 in diluted LFG.

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“…The bacterial immobilization usually occurs at the interface between cell and support material (Xie et al, 2012). The surface properties of support material, including roughness, porosity, hydrophilicity, charge, and chemical composition can markedly influence on the bacterial immobilization (Farrokhzadeh et al, 2017;La et al, 2018). These surface properties affect MOB immobilization, and further have effects on MOB growth and metabolic activity, and consequently alter the performance of MOB biofiltration.…”

Section: Introductionmentioning

confidence: 99%

Methane Elimination Using Biofiltration Packed With Fly Ash Ceramsite as Support Material

Sun

Yu-zhong

Yang

et al. 2020

Front. Bioeng. Biotechnol.

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Methane is a greenhouse gas and significantly contributes to global warming. Methane biofiltration with immobilized methane-oxidizing bacteria (MOB) is an efficient and ecofriendly approach for methane elimination. To achieve high methane elimination capacity (EC), it is necessary to use an exceptional support material to immobilize MOB. The MOB consortium was inoculated in biofilters to continuously eliminate 1% (v/v) of methane. Results showed that the immobilized MOB cells outperformed than the suspended MOB cells. The biofilter packed with fly ash ceramsite (FAC) held the highest average methane EC of 4.628 g h −1 m −3 , which was 33.4% higher than that of the biofilter with the suspended MOB cells. The qPCR revealed that FAC surface presented the highest pmoA gene abundance, which inferred that FAC surface immobilized the most MOB biomass. The XPS and contact angle measurement indicated that the desirable surface elemental composition and stronger surface hydrophilicity of FAC might favor MOB immobilization and accordingly improve methane elimination.

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Aerated biofilters with multiple-level air injection configurations to enhance biological treatment of methane emissions

Cited by 26 publications

References 27 publications

Mitigation of Methane, NMVOCs and Odor Emissions in Active and Passive Biofiltration Systems at Municipal Solid Waste Landfills

Mitigation of Methane, NMVOCs and Odor Emissions in Active and Passive Biofiltration Systems at Municipal Solid Waste Landfills

Treatment of landfill gas with low methane content by biocover systems

Methane Elimination Using Biofiltration Packed With Fly Ash Ceramsite as Support Material

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