Thermic model to predict biogas production in unheated fixed-dome digesters buried in the ground

Georgina Terradas-Ill, Pham Hung Cuong, Jin Mi Triolo, Jaime Martí-Herrero, Sven G. Sommer

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

In many developing countries, simple biogas digesters are used to produce energy for domestic purposes from anaerobic digestion of animal manure. We developed a simple, one-dimensional (1-D), thermal model with easily-available input data for unheated, unstirred, uninsulated, fixed-dome digesters buried in the soil to study heat transfer between biogas digester and its surroundings. The predicted temperatures in the dome, biogas and slurry inside the digester and the resulting biogas production are presented and validated. The model was well able to estimate digester temperature (linear slope nearly 1, R2 0.96). Model validation for methane production gave root-mean-square error (RMSE) of 54.4 L CH4 digester-1 day-1 and relative-root-mean-square errors (rRMSEP(%)) of 35.4%. The validation result was considerably improved if only using winter data (RMSE = 26.1 L CH4 digester-1 day-1; rRMSEP(%) = 17.7%). The model performed satisfactorily in light of the uncertainties attached to it. Since unheated digesters suffer critically low methane production during the winter, the model could be particularly useful for assessing methane production and for improving the ability of unheated digesters to provide sufficient energy during cold periods.
OriginalsprogEngelsk
TidsskriftEnvironmental Science & Technology (Washington)
Vol/bind48
Udgave nummer6
Sider (fra-til)3253−3262
ISSN0013-936X
DOI
StatusUdgivet - 2014

Citer dette

Terradas-Ill, Georgina ; Cuong, Pham Hung ; Triolo, Jin Mi ; Martí-Herrero, Jaime ; Sommer, Sven G. / Thermic model to predict biogas production in unheated fixed-dome digesters buried in the ground. I: Environmental Science & Technology (Washington). 2014 ; Bind 48, Nr. 6. s. 3253−3262.
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title = "Thermic model to predict biogas production in unheated fixed-dome digesters buried in the ground",
abstract = "In many developing countries, simple biogas digesters are used to produce energy for domestic purposes from anaerobic digestion of animal manure. We developed a simple, one-dimensional (1-D), thermal model with easily-available input data for unheated, unstirred, uninsulated, fixed-dome digesters buried in the soil to study heat transfer between biogas digester and its surroundings. The predicted temperatures in the dome, biogas and slurry inside the digester and the resulting biogas production are presented and validated. The model was well able to estimate digester temperature (linear slope nearly 1, R2 0.96). Model validation for methane production gave root-mean-square error (RMSE) of 54.4 L CH4 digester-1 day-1 and relative-root-mean-square errors (rRMSEP({\%})) of 35.4{\%}. The validation result was considerably improved if only using winter data (RMSE = 26.1 L CH4 digester-1 day-1; rRMSEP({\%}) = 17.7{\%}). The model performed satisfactorily in light of the uncertainties attached to it. Since unheated digesters suffer critically low methane production during the winter, the model could be particularly useful for assessing methane production and for improving the ability of unheated digesters to provide sufficient energy during cold periods.",
author = "Georgina Terradas-Ill and Cuong, {Pham Hung} and Triolo, {Jin Mi} and Jaime Mart{\'i}-Herrero and Sommer, {Sven G.}",
year = "2014",
doi = "10.1021/es403215w",
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Thermic model to predict biogas production in unheated fixed-dome digesters buried in the ground. / Terradas-Ill, Georgina; Cuong, Pham Hung; Triolo, Jin Mi ; Martí-Herrero, Jaime; Sommer, Sven G.

I: Environmental Science & Technology (Washington), Bind 48, Nr. 6, 2014, s. 3253−3262.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Thermic model to predict biogas production in unheated fixed-dome digesters buried in the ground

AU - Terradas-Ill, Georgina

AU - Cuong, Pham Hung

AU - Triolo, Jin Mi

AU - Martí-Herrero, Jaime

AU - Sommer, Sven G.

PY - 2014

Y1 - 2014

N2 - In many developing countries, simple biogas digesters are used to produce energy for domestic purposes from anaerobic digestion of animal manure. We developed a simple, one-dimensional (1-D), thermal model with easily-available input data for unheated, unstirred, uninsulated, fixed-dome digesters buried in the soil to study heat transfer between biogas digester and its surroundings. The predicted temperatures in the dome, biogas and slurry inside the digester and the resulting biogas production are presented and validated. The model was well able to estimate digester temperature (linear slope nearly 1, R2 0.96). Model validation for methane production gave root-mean-square error (RMSE) of 54.4 L CH4 digester-1 day-1 and relative-root-mean-square errors (rRMSEP(%)) of 35.4%. The validation result was considerably improved if only using winter data (RMSE = 26.1 L CH4 digester-1 day-1; rRMSEP(%) = 17.7%). The model performed satisfactorily in light of the uncertainties attached to it. Since unheated digesters suffer critically low methane production during the winter, the model could be particularly useful for assessing methane production and for improving the ability of unheated digesters to provide sufficient energy during cold periods.

AB - In many developing countries, simple biogas digesters are used to produce energy for domestic purposes from anaerobic digestion of animal manure. We developed a simple, one-dimensional (1-D), thermal model with easily-available input data for unheated, unstirred, uninsulated, fixed-dome digesters buried in the soil to study heat transfer between biogas digester and its surroundings. The predicted temperatures in the dome, biogas and slurry inside the digester and the resulting biogas production are presented and validated. The model was well able to estimate digester temperature (linear slope nearly 1, R2 0.96). Model validation for methane production gave root-mean-square error (RMSE) of 54.4 L CH4 digester-1 day-1 and relative-root-mean-square errors (rRMSEP(%)) of 35.4%. The validation result was considerably improved if only using winter data (RMSE = 26.1 L CH4 digester-1 day-1; rRMSEP(%) = 17.7%). The model performed satisfactorily in light of the uncertainties attached to it. Since unheated digesters suffer critically low methane production during the winter, the model could be particularly useful for assessing methane production and for improving the ability of unheated digesters to provide sufficient energy during cold periods.

U2 - 10.1021/es403215w

DO - 10.1021/es403215w

M3 - Journal article

VL - 48

SP - 3253−3262

JO - Environmental Science & Technology (Washington)

JF - Environmental Science & Technology (Washington)

SN - 0013-936X

IS - 6

ER -