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Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters

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Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters. / Tao, Bing; Alessi, Anna; Zhang, Yue; Chong, James Paul Jonathan; Heaven, Sonia; Banks, Charles J.

In: Applied Energy, Vol. 247, 08.2019, p. 670-681.

Research output: Contribution to journalArticlepeer-review

Harvard

Tao, B, Alessi, A, Zhang, Y, Chong, JPJ, Heaven, S & Banks, CJ 2019, 'Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters', Applied Energy, vol. 247, pp. 670-681. https://doi.org/10.1016/j.apenergy.2019.04.058

APA

Tao, B., Alessi, A., Zhang, Y., Chong, J. P. J., Heaven, S., & Banks, C. J. (2019). Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters. Applied Energy, 247, 670-681. https://doi.org/10.1016/j.apenergy.2019.04.058

Vancouver

Tao B, Alessi A, Zhang Y, Chong JPJ, Heaven S, Banks CJ. Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters. Applied Energy. 2019 Aug;247:670-681. https://doi.org/10.1016/j.apenergy.2019.04.058

Author

Tao, Bing ; Alessi, Anna ; Zhang, Yue ; Chong, James Paul Jonathan ; Heaven, Sonia ; Banks, Charles J. / Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters. In: Applied Energy. 2019 ; Vol. 247. pp. 670-681.

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@article{170d3d8239cc4124a49c680a86cc395d,
title = "Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters",
abstract = "In-situ biomethanisation reduces the CO2 in biogas to CH4 via direct H2 injection into an anaerobic digester, but volumetric methane production (VMP) is limited by organic loading. Ex-situ biomethanisation, where gaseous substrates are fed to pure or mixed cultures of hydrogenotrophic methanogens, offers higher VMP but requires an additional reactor and supply of essential nutrients. This work combined the two approaches in a novel hybrid application achieving simultaneous in-situ and ex-situ biomethanisation within an organically-loaded anaerobic digester receiving supplementary biogas. Conventional stirred-tank digesters were first acclimated to H2 addition, increasing biogas methane content from 50% to 95% and VMP from 0.86 to 1.51 L L-1 day-1 at a moderate loading rate of 3 g organic chemical oxygen demand per L per day (g CODorg L-1 day-1). Externally-produced biogas was then added to demonstrate simultaneous biomethanisation of endogenous and imported CO2. This further increased VMP to 2.76 L L-1 day-1 without affecting organic substrate degradation. In-situ CO2 reduction can alter digester pH by reducing bicarbonate buffering: the combined process operated stably at around pH 8.0 with 3-5% CO2 in the headspace. Microbial community analysis indicated the process was mediated by bacterial syntrophic acetate oxidation and highly enriched hydrogenotrophic methanogenic archaea (up to 97% of the archaeal population). This approach presents the opportunity to retrofit a single digester for H2 injection to convert and upgrade biogas from several others, minimising capital and operating costs by utilising both existing infrastructure and waste-derived feedstock nutrients for simultaneous biogas upgrading and power-to-methane. ",
author = "Bing Tao and Anna Alessi and Yue Zhang and Chong, {James Paul Jonathan} and Sonia Heaven and Banks, {Charles J.}",
note = "{\textcopyright} 2019 Elsevier Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. ",
year = "2019",
month = aug,
doi = "10.1016/j.apenergy.2019.04.058",
language = "English",
volume = "247",
pages = "670--681",
journal = "Applied Energy",
issn = "0306-2619",
publisher = "Elsevier BV",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Simultaneous biomethanisation of endogenous and imported CO2 in organically loaded anaerobic digesters

AU - Tao, Bing

AU - Alessi, Anna

AU - Zhang, Yue

AU - Chong, James Paul Jonathan

AU - Heaven, Sonia

AU - Banks, Charles J.

N1 - © 2019 Elsevier Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

PY - 2019/8

Y1 - 2019/8

N2 - In-situ biomethanisation reduces the CO2 in biogas to CH4 via direct H2 injection into an anaerobic digester, but volumetric methane production (VMP) is limited by organic loading. Ex-situ biomethanisation, where gaseous substrates are fed to pure or mixed cultures of hydrogenotrophic methanogens, offers higher VMP but requires an additional reactor and supply of essential nutrients. This work combined the two approaches in a novel hybrid application achieving simultaneous in-situ and ex-situ biomethanisation within an organically-loaded anaerobic digester receiving supplementary biogas. Conventional stirred-tank digesters were first acclimated to H2 addition, increasing biogas methane content from 50% to 95% and VMP from 0.86 to 1.51 L L-1 day-1 at a moderate loading rate of 3 g organic chemical oxygen demand per L per day (g CODorg L-1 day-1). Externally-produced biogas was then added to demonstrate simultaneous biomethanisation of endogenous and imported CO2. This further increased VMP to 2.76 L L-1 day-1 without affecting organic substrate degradation. In-situ CO2 reduction can alter digester pH by reducing bicarbonate buffering: the combined process operated stably at around pH 8.0 with 3-5% CO2 in the headspace. Microbial community analysis indicated the process was mediated by bacterial syntrophic acetate oxidation and highly enriched hydrogenotrophic methanogenic archaea (up to 97% of the archaeal population). This approach presents the opportunity to retrofit a single digester for H2 injection to convert and upgrade biogas from several others, minimising capital and operating costs by utilising both existing infrastructure and waste-derived feedstock nutrients for simultaneous biogas upgrading and power-to-methane.

AB - In-situ biomethanisation reduces the CO2 in biogas to CH4 via direct H2 injection into an anaerobic digester, but volumetric methane production (VMP) is limited by organic loading. Ex-situ biomethanisation, where gaseous substrates are fed to pure or mixed cultures of hydrogenotrophic methanogens, offers higher VMP but requires an additional reactor and supply of essential nutrients. This work combined the two approaches in a novel hybrid application achieving simultaneous in-situ and ex-situ biomethanisation within an organically-loaded anaerobic digester receiving supplementary biogas. Conventional stirred-tank digesters were first acclimated to H2 addition, increasing biogas methane content from 50% to 95% and VMP from 0.86 to 1.51 L L-1 day-1 at a moderate loading rate of 3 g organic chemical oxygen demand per L per day (g CODorg L-1 day-1). Externally-produced biogas was then added to demonstrate simultaneous biomethanisation of endogenous and imported CO2. This further increased VMP to 2.76 L L-1 day-1 without affecting organic substrate degradation. In-situ CO2 reduction can alter digester pH by reducing bicarbonate buffering: the combined process operated stably at around pH 8.0 with 3-5% CO2 in the headspace. Microbial community analysis indicated the process was mediated by bacterial syntrophic acetate oxidation and highly enriched hydrogenotrophic methanogenic archaea (up to 97% of the archaeal population). This approach presents the opportunity to retrofit a single digester for H2 injection to convert and upgrade biogas from several others, minimising capital and operating costs by utilising both existing infrastructure and waste-derived feedstock nutrients for simultaneous biogas upgrading and power-to-methane.

U2 - 10.1016/j.apenergy.2019.04.058

DO - 10.1016/j.apenergy.2019.04.058

M3 - Article

VL - 247

SP - 670

EP - 681

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

ER -