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Numerical and experimental analyses of methane leakage in shield tunnel

Frontiers of Structural and Civil Engineering   Pages 1011-1020 doi: 10.1007/s11709-023-0956-z

Abstract: as methane gas.As the airflow speed increased from 1.8 to 5.4 m/s, the methane emission was diluted, and the methaneaccumulation was only observed in the area near the methane leakage channels.In addition, laboratory tests on methane leakage through segment joints were performed.The results show that the leakage process can be divided into “rapid leakage” and “slight leakage”, depending

Keywords： shield tunnel     harmful gas leakage     numerical analysis     laboratory test    

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Aggravation of membrane fouling and methane leakage by a three-phase separator in an external anaerobic

Chao Pang, Chunhua He, Zhenhu Hu, Shoujun Yuan, Wei Wang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 4, doi: 10.1007/s11783-019-1131-6

Abstract: itemcontent>

The existence of three-phase separator aggravated methaneleakage of EAnCMBR.

Keywords： Anaerobic membrane bioreactor     Three-phase separator     Membrane fouling     Methane leakage     Sludge property    

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Dissolved methane in anaerobic effluent: Emission or recovery?

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 4, doi: 10.1007/s11783-022-1537-4

Abstract: However, dissolved methane in anaerobic effluent appears to be a barrier towards the energy and carbonAlthough several dissolved methane recovery methods have been developed, their engineering feasibilityIn this perspective, we thus intend to offer additional insights into the cost-benefit of dissolved methane

Keywords： Anaerobic treatment     Municipal wastewater     Dissolved methane     Methane recovery     Carbon emission    

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Effects of leakage and friction on the miniaturization of a Wankel compressor

Yilin ZHANG, Wen WANG

Frontiers in Energy 2011, Volume 5, Issue 1,   Pages 83-92 doi: 10.1007/s11708-010-0125-7

Abstract: The discussion is related to the effect of leakage and friction on the design limit (cooling capacityIn the simulation, the main leakage comes from the gaps between the rotor and the endplates as well asThe decreasing cooling capacity of the meso Wankel compressor increases the proportion of leakage to

Keywords： meso-scale     Wankel compressor     leakage     friction    

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Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 503-521 doi: 10.1007/s11709-023-0927-4

Abstract: This paper presents a novel approach for simulating the localized leakage behavior of segmentally linedThe proposed approach not only simulates localized leakage at the lining segment, but also captures thebehavior, stratum seepage field, and leakage-induced mechanical response of the tunnel lining.the leakage point and slight inward deformation at its diametrically opposite side.The seepage field depends on both the number and location of the leakage zones.

Keywords： segmentally lined tunnel     localized leakage     cohesive element     hydraulic behavior     numerical modeling    

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Long-term settlement behavior of ground around shield tunnel due to leakage of water in soft deposit

Huaina WU, Yeshuang XU, Shui-long SHEN, Jin-chun CHAI

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 194-198 doi: 10.1007/s11709-011-0105-y

Abstract: This paper aims to analyze the impact of the leakage of groundwater through segments on the long-term

Keywords： lining deficit     leakage of water     shield tunnel     settlement     soft deposit    

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A building unit decomposition model for energy leakage by infrared thermography image analysis

Yan SU, Fangjun HONG, Lianjie SHU

Frontiers in Energy 2020, Volume 14, Issue 4,   Pages 901-921 doi: 10.1007/s11708-020-0679-y

Abstract: A quantitative energy leakage model was developed based on the thermography image data measured for bothThe uncertainties of the predicted total building energy leakage are about 14.7%, 12.8%, 12.4%, and 15.8%The typical daily thermal energy leakage value in winter is the highest among the four seasons.The present decomposition model for energy leakage is expected to provide a practical tool for quantitativeanalysis of energy leakage of buildings.

Keywords： heat conductivity     heat coefficient     heat &fllig     ux     infrared thermography     thermal image    

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USING NUTRITIONAL STRATEGIES TO MITIGATE RUMINAL METHANE EMISSIONS FROM RUMINANTS

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 3,   Pages 390-402 doi: 10.15302/J-FASE-2023504

Abstract:

● Microbial fermentation in the rumen is a main source of methane

Keywords： nutritional strategy     mitigation     microbe     methane     ruminant    

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Acid Orange 7 degradation using methane as the sole carbon source and electron donor

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 3, doi: 10.1007/s11783-021-1468-5

Abstract:

• AO7 degradation was coupled with anaerobic methane oxidation.

Keywords： Azo dyes     AO7 degradation     Anaerobic methane oxidation     Microbial community     ANME-2d    

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Variation characteristics of atmospheric methane and carbon dioxide in summertime at a coastal site in

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 11, doi: 10.1007/s11783-022-1574-z

Abstract:

● Diurnal patterns of CH4 and CO2 are clearly extracted using EEMD.

Keywords： Methane     Carbon dioxide     Diurnal pattern     Ensemble empirical mode decomposition     South China Sea     Sea    

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Enhanced methane production during long-term UASB operation at high organic loads as enabled by the immobilized

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 6, doi: 10.1007/s11783-021-1505-4

Abstract:

• Fungi enable the constant UASB operation even at OLR of 25.0 kg/(m3×d).

Keywords： Anaerobic digestion     Fungi     Methane production     High OLR     Microbial community    

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propionate-oxidizing microflora and its bioaugmentation on anaerobic wastewater treatment for enhancing methane

Chong Liu, Jianzheng Li, Shuo Wang, Loring Nies

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 4, doi: 10.1007/s11783-016-0856-8

Abstract: Methane yield and COD removal were enhanced by bioaugmentation of microflora B83.Hydrogen-producing acetogensis was a rate-limiting step in methane fermentation.Methane fermentation process can be restricted and even destroyed by the accumulation of propionate becauseTo enhance anaerobic wastewater treatment process for methane production and COD removal, a syntrophicHydrogen-producing acetogenesis appeared to be a rate-limiting step in methane fermentation, and the

Keywords： Anaerobic wastewater treatment     Methane production     Hydrogen-producing acetogenesis     Methanogenesis     Rate-limiting    

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Progress in developing an innovative lean burn catalytic turbine technology for fugitive methane mitigation

Shi SU, Xinxiang YU

Frontiers in Energy 2011, Volume 5, Issue 2,   Pages 229-235 doi: 10.1007/s11708-011-0147-9

Abstract: Approximately 2.8 × 10 m of methane is emitted per year to the atmosphere from coal mining activitiesMitigation and utilization of the fugitive coal mine methane is very difficult because its concentrationis very low and varies from 0.1% to1%, and the methane is contained in a large air flow rate of 150–overviews existing and developing technologies for the mitigation and utilization of the fugitive mine methaneThis turbine system can be powered with about 1% methane in air.

Keywords： coal mine methane     mitigation and utilization     lean burn gas turbine     catalytic combustion    

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Transient process of methane-oxygen diffusion flame-street establishment in a microchannel

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 988-999 doi: 10.1007/s11708-021-0755-y

Abstract: In the present paper, the dynamic formation process of a methane-oxygen diffusion flame-street structure

Keywords： micro-combustion     flame-street     diffusion flame     mixing layer     flame propagation speed    

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ALKALINE PRETREATMENT AND AIR MIXING FOR IMPROVEMENT OF METHANE PRODUCTION FROM ANAEROBIC CO-DIGESTION

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 3,   Pages 424-436 doi: 10.15302/J-FASE-2023506

Abstract:

● Integration of alkaline pretreatment and air mixing for co-digestion was validated.

Keywords： sodium hydroxide     air injection     cumulative methane yield     kinetic modeling analysis     digestate    

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Title Author Date Type Operation

Numerical and experimental analyses of methane leakage in shield tunnel

Journal Article

Aggravation of membrane fouling and methane leakage by a three-phase separator in an external anaerobic

Chao Pang, Chunhua He, Zhenhu Hu, Shoujun Yuan, Wei Wang

Journal Article

Dissolved methane in anaerobic effluent: Emission or recovery?

Journal Article

Effects of leakage and friction on the miniaturization of a Wankel compressor

Yilin ZHANG, Wen WANG

Journal Article

Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

Journal Article

Long-term settlement behavior of ground around shield tunnel due to leakage of water in soft deposit

Huaina WU, Yeshuang XU, Shui-long SHEN, Jin-chun CHAI

Journal Article

A building unit decomposition model for energy leakage by infrared thermography image analysis

Yan SU, Fangjun HONG, Lianjie SHU

Journal Article

USING NUTRITIONAL STRATEGIES TO MITIGATE RUMINAL METHANE EMISSIONS FROM RUMINANTS

Journal Article

Acid Orange 7 degradation using methane as the sole carbon source and electron donor

Journal Article

Variation characteristics of atmospheric methane and carbon dioxide in summertime at a coastal site in

Journal Article

Enhanced methane production during long-term UASB operation at high organic loads as enabled by the immobilized

Journal Article

propionate-oxidizing microflora and its bioaugmentation on anaerobic wastewater treatment for enhancing methane

Chong Liu, Jianzheng Li, Shuo Wang, Loring Nies

Journal Article

Progress in developing an innovative lean burn catalytic turbine technology for fugitive methane mitigation

Shi SU, Xinxiang YU

Journal Article

Transient process of methane-oxygen diffusion flame-street establishment in a microchannel

Journal Article

ALKALINE PRETREATMENT AND AIR MIXING FOR IMPROVEMENT OF METHANE PRODUCTION FROM ANAEROBIC CO-DIGESTION

Journal Article