Bossuwé, Mathieu

Ghekiere, Greet

Vervaeren, Han

Willems, Bernard

English

Ghent University Academic Bibliography

Vervaeren Han a , Greet Ghekiere b, Mathieu Bossuwé a, Bernard Willems aa EnBiChem Research Group, University College West Flanders, Kortrijk, Belgiumb POVLT, Ieperseweg 87, 8800 Rumbeke, BelgiumAnaerobic digestion : process flow and innovationMaterial and MethodsResultsConclusions(Bio)-enzymatic additives to boost anaerobic digestionMore information: Han.vervaeren@howest.be www.howest.beProcess flowWill the additive facilitate the hydrolysis and thus increase the biogas production?Ensiled biomassHydrolysisSimple moleculesPrecursors BiogasFermentationMethanogenesisSlowFastSensitiveHarvested biomassEnsilage Simple Low cost Readily upscalable More energy production ?BenefitsInnovation(Bio)-enzymaticadditiveMore biogas ???FastEnsiled biomassHydrolysisHarvested biomassEnsilageBatch testsFig. Harvested, chopped maize Fig. Ensiled maizeFig. Batch testsFig. Semi-continuous testEnergy content of biogas(Nm3 CH4 / ton ODM)• 1 x input • day-1• 50 L reactor• 37 °C• Continuous monitoring• 1 x input• 2,2 L reactor• 37 °C• Batch monitoringTreatments : • Control (no addition)• Mix 1 : homo- and heterofermentative bacteria• Mix 2 : homo- and heterofermentative bacteria + enzymes• Mix 3 : complex (bacteria + yeasts)Four treatments tested. Biogas production followed up in batch and semi-continuous tests.EnBiChem0501001502002503003504000 5 10 15 20Methaneproduction(Nm³CH4/ton ODM)DaysControl Mix 3 Mix 2 Mix 1Semi-continous testsUp to 14,5 % surplus methane (duplicate experiments) Up to 22,5 % surplus methaneAll treatments statistically significant higher than control !  Both in batch tests and semi-continuous test : more methane production. Up to > 20 % surplus compared to control Comparable surplus between treatments Good ensilage (low DM losses, pH ~ 4, high lactic acid and acetic acid concentrations, low NH3 losses) (results not shown) Simple and straight forward upscaling possible0,00100,00200,00300,00400,00500,00600,0024 25 26 27 34 60 61 62 66 67 68 69 70Methane  production (Nm3CH4/ton ODM)Days after startupControl Mix 1 Mix 2 Mix 3

(Bio)-enzymatic additives to boost anaerobic digestion

https://biblio.ugent.be/publication/3222633/file/3222641

(Bio)-enzymatic additives to boost anaerobic digestion

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Ghent University Academic Bibliography