Influence of pressures up to 50 bar on two-stage anaerobic digestion

Merkle, Wolfgang; Baer, Katharina; Lindner, Jonas; Zielonka, Simon; Ortloff, Felix; Graf, Frank; Kolb, Thomas; Jungbluth, Thomas; Lemmer, Andreas

doi:10.1016/j.biortech.2017.02.013

Cited by 40 publications

(24 citation statements)

References 16 publications

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“…The VFA/TIC fluctuated in a range of 0.19 ± 0.04 for modulation 480 and 0.27 ± 0.03 for modulation 240. The values were in a small range, and overall the VFA/TIC indicates a continuous stable methanation process (Merkle et al, 2017). As already suspected during the discussion of the moderately declining pH values, a slightly decreasing TIC was measured, which indicates a dilution of the process liquid by metabolic water production.…”

Section: Analysis Of the Process Liquidsupporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%

“…For this purpose, the product liquid of a continuous two‐stage anaerobic digestion experimental plant from Merkle et al. () was used. According to Vintiloiu, Lemmer, Oechsner, and Jungbluth () and Vintiloiu et al.…”

Section: Methodsmentioning

confidence: 99%

“…For this purpose, the product liquid of a continuous F I G U R E 1 Piping and instrument diagram of the test facility with the three trickle-bed reactors (R1-R3), the injection of the educt gases CO 2 and H 2 (MFC 1.1-MFC 3.2), the circulation unit of the nutrient solution (P 1, VM 1.1-VM 3.2), the gas analysis and the gas quantity measurement (MFC 1.3-MFC 3.3) with He as the tracer gas. The figure also shows the gas coolers (CG 1-3), the sighting pipes (SP 1-3) and the sampling valves (VK 1-3) two-stage anaerobic digestion experimental plant from Merkle et al (2017) was used. According to Vintiloiu, Lemmer, Oechsner, and Jungbluth (2012) and Vintiloiu et al (2013), this predigested process liquid is advantageous because it contains all essential nutrients for the methanogenic microorganisms and nearly no energy rich substances, such as acids and alcohols, that could affect the methane production of the reactors (Table 1).…”

Section: Methodsmentioning

confidence: 99%

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Performance enhancement of biological methanation with trickle bed reactors by liquid flow modulation

Ullrich

Lemmer

2018

GCB Bioenergy

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Experiments were carried out to investigate the influence of liquid flow modulation of trickle bed reactors (TBR) on biological hydrogen methanation (BHM).The modulation promises to improve the gas-liquid mass transfer and has already been demonstrated in trickle bed reactors of other fields of application. Therefore, the influence of four different circulation intervals with pauses from two to 1,440 min was investigated in TBR for BHM. The results showed that as pause intervals without sprinkling became longer, the methane content increased from 88.61 ± 1.58 vol-% at a circulation interval of 2 min to up to 97.19 ± 0.46 vol-% at a circulation interval of 1,440 min. The analysis of the process liquid indicated a stable biological process at any trial phase. This study demonstrated that the performance of TBR on BHM can be significantly improved by liquid flow modulation, thus significantly reducing operating costs. K E Y W O R D Sbiological methanation, hydrogen, liquid flow modulation, power-to-gas, renewable energy, trickle-bedreactor

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Section: Analysis Of the Process Liquidsupporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Performance enhancement of biological methanation with trickle bed reactors by liquid flow modulation

Ullrich

Lemmer

2018

GCB Bioenergy

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“…The effluent of an anaerobic filter [29] was used as the process liquid to provide the necessary nutrients and was sprinkled over the fixed bed in counter current with the gases. This anaerobic filter was part of a two-stage lab-scale biogas system and was run at a pressure of up to 50 bars.…”

Section: Methodsmentioning

confidence: 99%

Effect of Different Operating Temperatures on the Biological Hydrogen Methanation in Trickle Bed Reactors

Lemmer

Ullrich

2018

Energies

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To improve the reactor efficiency, this study investigated the influence of temperature on the biological hydrogen methanation (BHM) in trickle-bed reactors (TBR). Rising temperatures increase the metabolic activity of methanogenic microorganisms, thus leading to higher reactor specific methane formation rates (MFR). In order to quantify the potential for improved performance, experiments with four different operating temperatures ranging from 40 to 55 • C were carried out. Methane content increased from 88.29 ± 2.12 vol % at 40 • C to 94.99 ± 0.81 vol % at 55 • C with a stable biological process. Furthermore, a reactor specific methane formation rate (MFR) of up to 8.85 ± 0.45 m 3 m −3 d −1 was achieved. It could be shown that the microorganisms were able to adapt to higher temperatures within hours. The tests showed that TBR performance with regard to BHM can be significantly increased by increasing the operating temperature.

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The Relationship Between Bioreactor Design and Feedstock for Optimal Biogas Production

Herrmann

Ramm

Murphy

2018

Green Energy and Technology

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Influence of pressures up to 50 bar on two-stage anaerobic digestion

Cited by 40 publications

References 16 publications

Performance enhancement of biological methanation with trickle bed reactors by liquid flow modulation

Performance enhancement of biological methanation with trickle bed reactors by liquid flow modulation

Effect of Different Operating Temperatures on the Biological Hydrogen Methanation in Trickle Bed Reactors

The Relationship Between Bioreactor Design and Feedstock for Optimal Biogas Production

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