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Towards a standardization of biomethane potential tests : A commentary

Affiliation
Ecole Polytechnique Fédérale de Lausanne, ENAC-IIE Laboratory for Environmental Biotechnology, Station 6, Lausanne, Switzerland
Holliger, Christof;
Affiliation
Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, C/ Martí i Franquès 1, Barcelona, Spain
Astals, Sergi;
Affiliation
Methaconsult, Preverenges, Switzerland
de Laclos, Hélène Fruteau;
Affiliation
Hafner Consulting LLC, Reston, United States
Hafner, Sasha D.;
Affiliation
Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, Garching, Germany
Koch, Konrad;
Affiliation
Biochemical Conversion Department, Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, Torgauer Str. 116, Leipzig, Germany
Weinrich, Sören

Inter-laboratory reproducibility of biomethane potential (BMP) is dismal, with differences in BMP values for the same sample exceeding a factor of two in some cases. Multiple national and international inter-laboratory studies show rather low reproducibility in measurement of BMP, with differences for the same substrate exceeding a factor of two in some cases despite the existence of well-known protocols. A large group of BMP researchers directly addressed this issue during a workshop held in Leysin, Switzerland, in June 2015. The workshop resulted in a new set of guidelines for BMP tests published in 2016. The work has continued with two international inter-laboratory studies and one additional workshop held in Freising, Germany, in 2018. The dataset generated by the two inter-laboratory studies were used to refine the validation criteria for BMP tests. Based on these new results, an update to the original guidelines is proposed.

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