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Waste Manag. 2014 Nov;34(11):1939-48. doi: 10.1016/j.wasman.2014.07.018. Epub 2014 Aug 21.

Towards eliminating systematic errors caused by the experimental conditions in Biochemical Methane Potential (BMP) tests.

Author information

1
Department of Biotechnology, Lund University, Getingevägen 60, 221 00 Lund, Sweden. Electronic address: sten.stromberg@biotek.lu.se.
2
Bioprocess Control, Scheelevägen 22, 223 63 Lund, Sweden. Electronic address: mn@bioprocesscontrol.com.
3
Department of Biotechnology, Lund University, Getingevägen 60, 221 00 Lund, Sweden; Bioprocess Control, Scheelevägen 22, 223 63 Lund, Sweden. Electronic address: jing.liu@biotek.lu.se.

Abstract

The Biochemical Methane Potential (BMP) test is increasingly recognised as a tool for selecting and pricing biomass material for production of biogas. However, the results for the same substrate often differ between laboratories and much work to standardise such tests is still needed. In the current study, the effects from four environmental factors (i.e. ambient temperature and pressure, water vapour content and initial gas composition of the reactor headspace) on the degradation kinetics and the determined methane potential were evaluated with a 2(4) full factorial design. Four substrates, with different biodegradation profiles, were investigated and the ambient temperature was found to be the most significant contributor to errors in the methane potential. Concerning the kinetics of the process, the environmental factors' impact on the calculated rate constants was negligible. The impact of the environmental factors on the kinetic parameters and methane potential from performing a BMP test at different geographical locations around the world was simulated by adjusting the data according to the ambient temperature and pressure of some chosen model sites. The largest effect on the methane potential was registered from tests performed at high altitudes due to a low ambient pressure. The results from this study illustrate the importance of considering the environmental factors' influence on volumetric gas measurement in BMP tests. This is essential to achieve trustworthy and standardised results that can be used by researchers and end users from all over the world.

KEYWORDS:

AMPTS; Anaerobic digestion; BMP test; Degradation kinetics; Gas measurements; Standardisation

PMID:
25151444
DOI:
10.1016/j.wasman.2014.07.018
[Indexed for MEDLINE]
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