Escobar, Esperanza Jurado

Kragelund, C.

Njoku, Stephen Ikechukwu

Uellendahl, Hinrich Wilhelm

The re-injection loop concept proposes the recirculation of lignocellulosic organic matter after a first cycle of anaerobic digestion in order to increase the conversion into biogas. This re-circulation can potentially increase the methane yield up to 20%. In this study thermal and enzymatic treatment of the digested manure fibers (DMF) in combination with the re-injection loop concept were tested. Thermal treatment of DMF at 105oC showed an increase of the specific methane yield of DMF by 65% while no siginificant effect was observed for enzymatic treatment of DMF for 1 h prior to recirculation into the digester

    Aalborg UniversitetThermal and enzymatic treatment of digested manure fibers in the re-injection loopconcept to increase biogas yieldsEscobar, Esperanza Jurado; Uellendahl, Hinrich Wilhelm; Njoku, Stephen Ikechukwu;Kragelund, C.Published in:Poster abstract in the Proceedings of the 14th World Congress on Anaerobic DigestionPublication date:2015Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Escobar, E. J., Uellendahl, H. W., Njoku, S. I., & Kragelund, C. (2015). Thermal and enzymatic treatment ofdigested manure fibers in the re-injection loop concept to increase biogas yields. In Poster abstract in theProceedings of the 14th World Congress on Anaerobic Digestion: Reuse of effluent and digestate IWAPublishing Company.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: April 30, 2017Thermal and enzymatic treatment of digested manure fibers in the re-injection loop concept to increase biogas yields   Esperanza Jurado*a; Njoku, S. I. a;  C. Kragelundb and Uellendahl, H. a aSection for Sustainable Biotechnology, Aalborg University Copenhagen (AAU-Cph) www.sustainablebiotechnology.aau.dk bDanish Technological Institute, Kongsvang Allé 29, DK-8000 Aarhus C, Denmark.  *corresponding author: eje@bio.aau.dk   • Thermal treatment at 105oC for 1 hour showed to increase the methane yield by up to 65% compared to untreated DMF. •  The addition of enzyme blends showed to have no significant effect on increasing the methane yield of DMF, probably due to the high pH of the digested manure fraction, which is unfavorable for the activity of these enzymes.  • Economic evaluation show that the benefit of the treatment is more than 5 € per kg enzymes if an increase in methane yield by more than 12.34 m3-CH4/t-VS can be achieved with a low dosage of 0.1% and a VS/TS ratio of 75%. It also shows that the benefit declines significantly if a higher enzyme dosage is needed and also the VS/TS ratio has quite an impact on the revenue.                   The reinjection loop is developed as an alternative to the conventional manure biogas treatment to increase the methane yield of the recalcitrant solid manure fraction and wheat straw (WS). This concept enhance biogas yield per tone of manure by: 1. Digestion of easy degradable compounds by anaerobic digestion. 2. Separation of solid and liquid fraction. 3. Treatment of solid  fraction. 4. Reinjection of the  treated solid fraction.      Initial screening of enzymes Thermal treatment            *** The revenue is calculated as € per kg enzyme blend added, based on a revenue for selling electricity from biogas in Denmark of 1.15 kr./kWhel = 0.15 €/kWhel, equivalent to a price of 0.54 €/m3-CH4 for the produced methane.  VS % Enzyme dosage Increase of methane yield Revenue %VS of TS g/g-TS m3-CH4/t-VS m3-CH4/kg-enzyme €/kg-enzyme 75.0% 0.10% 10.00 7.50 4.05  € 75.0% 0.10% 15.00 11.25 6.08  € 75.0% 0.10% 20.00 15.00 8.10  € 75.0% 0.10% 25.00 18.75 10.13  € 75.0% 0.10% 30.00 22.50 12.16  € 75.0% 0.10% 35.00 26.25 14.18  € 50.0% 0.10% 35.00 17.50 9.45  € 75.0% 0.50% 35.00 5.25 2.84  € 50.0% 0.50% 35.00 3.50 1.89  €  Economic analysis Anaerobic Digestion Separation MANURE FIBER FRACTION LIQUID FERTILIZER BIOGAS 2G Biomass Enzymatic Treatment Pretreatment Conclusion  Acknowledgements The EU BIOMAN project is funded by the European union´s Seventh Framework Program managed by REA- under the grant agreement no. FP7-SME-2012, 315664  Enzymatic hydrolysis  Re-injection loop concept Testing of potential candidates on WS and digested manure fibers  Effect of pH and enzyme dosage 

Thermal and enzymatic treatment of digested manure fibers in the re-injection loop concept to increase biogas yields

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Thermal and enzymatic treatment of digested manure fibers in the re-injection loop concept to increase biogas yields

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