Influence of headspace flushing on methane production in Biochemical Methane Potential (BMP) tests

Konrad Koch; Yadira Bajón Fernández; Jörg E. Drewes

doi:10.1016/j.biortech.2015.03.071

Influence of headspace flushing on methane production in Biochemical Methane Potential (BMP) tests

Konrad Koch, Yadira Bajón Fernández, Jörg E. Drewes

Chair of Urban Water Systems Engineering

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

The influence of headspace flushing on the specific methane (CH₄) production of blank samples with just inoculum in Biochemical Methane Potential (BMP) tests was studied. The three most common ways were applied: flushing with nitrogen (N₂) gas, flushing with a mixture of N₂ and CO₂ (80/20v/v), and no flushing. The results revealed that removing the oxygen is crucial to avoid aerobic respiration, which caused both hindered activity of methanogens and loss of methane potential. Furthermore it was demonstrated that 20% of CO₂ in the flush gas increased significantly the methane production by over 20% compared to the flushing with pure N₂. In order to mimic the same headspace conditions as in full-scale treatment plants, using a flush gas with a similar CO₂ concentration as the expected biogas is suggested.

Original language	English
Pages (from-to)	173-178
Number of pages	6
Journal	Bioresource Technology
Volume	186
DOIs	https://doi.org/10.1016/j.biortech.2015.03.071
State	Published - 1 Jun 2015

Keywords

BMP test
Headspace correction
Headspace flushing
N/CO mixture
Nitrogen gas

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.biortech.2015.03.071

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title = "Influence of headspace flushing on methane production in Biochemical Methane Potential (BMP) tests",

abstract = "The influence of headspace flushing on the specific methane (CH4) production of blank samples with just inoculum in Biochemical Methane Potential (BMP) tests was studied. The three most common ways were applied: flushing with nitrogen (N2) gas, flushing with a mixture of N2 and CO2 (80/20v/v), and no flushing. The results revealed that removing the oxygen is crucial to avoid aerobic respiration, which caused both hindered activity of methanogens and loss of methane potential. Furthermore it was demonstrated that 20% of CO2 in the flush gas increased significantly the methane production by over 20% compared to the flushing with pure N2. In order to mimic the same headspace conditions as in full-scale treatment plants, using a flush gas with a similar CO2 concentration as the expected biogas is suggested.",

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AU - Koch, Konrad

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AU - Drewes, Jörg E.

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Y1 - 2015/6/1

N2 - The influence of headspace flushing on the specific methane (CH4) production of blank samples with just inoculum in Biochemical Methane Potential (BMP) tests was studied. The three most common ways were applied: flushing with nitrogen (N2) gas, flushing with a mixture of N2 and CO2 (80/20v/v), and no flushing. The results revealed that removing the oxygen is crucial to avoid aerobic respiration, which caused both hindered activity of methanogens and loss of methane potential. Furthermore it was demonstrated that 20% of CO2 in the flush gas increased significantly the methane production by over 20% compared to the flushing with pure N2. In order to mimic the same headspace conditions as in full-scale treatment plants, using a flush gas with a similar CO2 concentration as the expected biogas is suggested.

AB - The influence of headspace flushing on the specific methane (CH4) production of blank samples with just inoculum in Biochemical Methane Potential (BMP) tests was studied. The three most common ways were applied: flushing with nitrogen (N2) gas, flushing with a mixture of N2 and CO2 (80/20v/v), and no flushing. The results revealed that removing the oxygen is crucial to avoid aerobic respiration, which caused both hindered activity of methanogens and loss of methane potential. Furthermore it was demonstrated that 20% of CO2 in the flush gas increased significantly the methane production by over 20% compared to the flushing with pure N2. In order to mimic the same headspace conditions as in full-scale treatment plants, using a flush gas with a similar CO2 concentration as the expected biogas is suggested.

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KW - Headspace correction

KW - Headspace flushing

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KW - Nitrogen gas

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Influence of headspace flushing on methane production in Biochemical Methane Potential (BMP) tests

Abstract

Keywords

UN SDGs

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