Pig manure (solid) — BMP: 5 studies, weighted mean 293 m³ CH₄/t VS
293 m³ CH₄/t VS weighted mean from 5 studies
good — editorial rating for biogas plants≈54 %
BMP testing — substrate methane potential — page 5
BMP (biochemical methane potential) is the amount of methane that can be obtained from a unit of organic mass of a substrate in a batch test. We compile the results of many publications for each substrate, calculate a weighted mean and show all the curves at once.
RSS
VDI 4630 and ISO 11734: what they regulate and how they differ from BMP protocols
Two documents often cited in fermentation test reports: the German guideline VDI 4630 and the standard ISO 11734. We explain their scope and why they are not interchangeable.
Rapeseed straw — BMP: 2 studies, weighted mean 241 m³ CH₄/t VS
241 m³ CH₄/t VS weighted mean from 2 studies
good — editorial rating for biogas plants≈53 %
Clover-grass silage — BMP: 2 studies, weighted mean 296 m³ CH₄/t VS
296 m³ CH₄/t VS weighted mean from 2 studies
≈52 %
Pearl millet — BMP: 2 studies, weighted mean 280 m³ CH₄/t VS
280 m³ CH₄/t VS weighted mean from 2 studies
≈52 %
Theoretical methane potential: the Buswell and Boyle formula with calculation examples
How to calculate the maximum yield of CH₄ and CO₂ from a molecular formula or elemental composition. Three numerical examples, the limitations of the method and comparison with the BMP result.
Palm oil mill effluent (POME) — BMP: 2 studies, weighted mean 431 m³ CH₄/t VS
431 m³ CH₄/t VS weighted mean from 2 studies
≈63 %
Scatter of BMP results between laboratories: where it comes from and how to read it
Why does the same silage give different BMP in different laboratories? A review of the sources of scatter, measures (SD, RSD, z-score), an example and rules for comparing results.
Cereal grain and flour — BMP: 4 studies, weighted mean 350 m³ CH₄/t VS
350 m³ CH₄/t VS weighted mean from 4 studies
very good — editorial rating for biogas plants≈52 %
The modified Gompertz model in BMP tests: lag, rate and potential
When a BMP curve has a lag phase and a sigmoidal shape, the modified Gompertz model is used. We explain the parameters P, Rm and λ, and show a calculation and the pitfalls.
Peaches — BMP: 2 studies, weighted mean 344 m³ CH₄/t VS
344 m³ CH₄/t VS weighted mean from 2 studies
≈52 %
Cattle slurry — BMP: 14 studies, weighted mean 236 m³ CH₄/t VS
236 m³ CH₄/t VS weighted mean from 14 studies
very good — editorial rating for biogas plants≈54 %
Cereal residues (screenings, dust, silo losses) — BMP: 10 studies, weighted mean 324 m³ CH₄/t VS
324 m³ CH₄/t VS weighted mean from 10 studies
good — editorial rating for biogas plants≈53 %
Sweet corn processing residues — BMP: 8 studies, weighted mean 323 m³ CH₄/t VS
323 m³ CH₄/t VS weighted mean from 8 studies
good — editorial rating for biogas plants≈52 %
Rambutan peel — BMP: 3 studies, weighted mean 99 m³ CH₄/t VS
99 m³ CH₄/t VS weighted mean from 3 studies
neutral — editorial rating for biogas plants≈52 %
First-order kinetics in the BMP test: the rate constant k, B₀ and the t90 time
How can a BMP curve be described with a single equation? The first-order model gives B₀, the rate constant k and the t90 time. We show the fitting, an example and the limitations of the model.
Mixed/unspecified manure — BMP: 5 studies, weighted mean 289 m³ CH₄/t VS
289 m³ CH₄/t VS weighted mean from 5 studies
good — editorial rating for biogas plants≈53 %
Tomato leaves and stems — BMP: 6 studies, weighted mean 200 m³ CH₄/t VS
200 m³ CH₄/t VS weighted mean from 6 studies
58 %
Cattail (Typha spp.) — BMP: 11 studies, weighted mean 154 m³ CH₄/t VS
154 m³ CH₄/t VS weighted mean from 11 studies
≈52 %
Rye and vetch mixture — BMP: 2 studies, weighted mean 270 m³ CH₄/t VS
270 m³ CH₄/t VS weighted mean from 2 studies
good — editorial rating for biogas plants≈52 %
Grass (fresh and silage) — BMP: 145 studies, weighted mean 345 m³ CH₄/t VS
345 m³ CH₄/t VS weighted mean from 145 studies
good — editorial rating for biogas plants≈53 %
Whole legume vegetables (green soybean, mung bean, adzuki bean, lablab) — BMP: 4 studies, mean 261 m³ CH₄/t VS
261 m³ CH₄/t VS weighted mean from 4 studies
≈55 %
Compostable bags — BMP: 8 studies, weighted mean 119 m³ CH₄/t VS
119 m³ CH₄/t VS weighted mean from 8 studies
neutral — editorial rating for biogas plants≈52 %
BMP and biogas plant yield: why laboratory and full-scale results differ
Why does laboratory BMP usually exceed the actual yield of a plant? We break the difference down into factors: time, kinetics, losses, data errors and measurements. With a worked example.