Next Article in Journal
A Process-Based, Fully Distributed Soil Erosion and Sediment Transport Model for WRF-Hydro
Next Article in Special Issue
Measurement of Biochemical Methane Potential of Heterogeneous Solid Substrates: Results of a Two-Phase French Inter-Laboratory Study
Previous Article in Journal
Multi-Biomarker Assessment in Common Carp (Cyprinus carpio, Linnaeus 1758) Liver after Acute Chlorpyrifos Exposure
Previous Article in Special Issue
Existing Empirical Kinetic Models in Biochemical Methane Potential (BMP) Testing, Their Selection and Numerical Solution
Article

How Different Are Manometric, Gravimetric, and Automated Volumetric BMP Results?

1
DEEP Laboratory–Wastes Water Environment Pollution, INSA-Lyon, Université de Lyon, EA 7429, 9 Rue de la Physique, CEDEX, F-69621 Villeurbanne, France
2
Hafner Consulting LLC, Reston, VA 20191, USA
3
Arkolia Energies, 16 Rue des Vergers, F34130 Mudaison, France
*
Author to whom correspondence should be addressed.
Water 2020, 12(6), 1839; https://doi.org/10.3390/w12061839
Received: 15 May 2020 / Revised: 23 June 2020 / Accepted: 24 June 2020 / Published: 26 June 2020
The objectives of this study were to: (1) quantify differences in biochemical methane potential (BMP) measured using three measurement methods, including two popular methods (a commercial automated system (AMPTS II) and manual manometric) and one newer method (gravimetric), and (2) assess the importance of the mixing position in the measurement sequence. Powdered microcrystalline cellulose was used as the substrate in simultaneous tests. All methods gave similar results (<8% difference in the mean BMP) and were reasonably accurate (recovery of 80–86% of the theoretical maximum BMP). Manometric BMP values were consistently lower than gravimetric by 4–5%. Precision was lower for the automated method (relative standard deviation (RSD) of about 7%) than for the manual methods (RSD about 1–3%). Mixing after biogas measurement resulted in 3% higher BMP for both manual methods than mixing before, due to the lower measured CH4 production from blanks. This effect may be linked to a fraction of CH4 that remains dissolved or even as attached bubbles, and suggests that mixing before measurement is preferable. The automated volumetric and gravimetric methods (mode 2) gave very similar mean BMP values (1% different). However, kinetic analysis showed that methane production was faster with the automated volumetric method. This could come from an error in the estimation of the CH4 production rate for the automated method, or an increase in the degradation rate due to better mixing. Both automatic volumetric and manual gravimetric measurements met current validation criteria for mean cellulose BMP, but the RSD from the automated system exceeded the limit. View Full-Text
Keywords: biochemical methane potential; biomethane potential; anaerobic digestion; batch assays; biogas production; volumetric method; manometric method; gravimetric method; method comparison biochemical methane potential; biomethane potential; anaerobic digestion; batch assays; biogas production; volumetric method; manometric method; gravimetric method; method comparison
Show Figures

Figure 1

MDPI and ACS Style

Amodeo, C.; Hafner, S.D.; Teixeira Franco, R.; Benbelkacem, H.; Moretti, P.; Bayard, R.; Buffière, P. How Different Are Manometric, Gravimetric, and Automated Volumetric BMP Results? Water 2020, 12, 1839. https://doi.org/10.3390/w12061839

AMA Style

Amodeo C, Hafner SD, Teixeira Franco R, Benbelkacem H, Moretti P, Bayard R, Buffière P. How Different Are Manometric, Gravimetric, and Automated Volumetric BMP Results? Water. 2020; 12(6):1839. https://doi.org/10.3390/w12061839

Chicago/Turabian Style

Amodeo, Corrado, Sasha D. Hafner, Rúben Teixeira Franco, Hassen Benbelkacem, Paul Moretti, Rémy Bayard, and Pierre Buffière. 2020. "How Different Are Manometric, Gravimetric, and Automated Volumetric BMP Results?" Water 12, no. 6: 1839. https://doi.org/10.3390/w12061839

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop