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WP 4: Environmental impacts of recycling fermentates from biogas production

WP 4: Environmental impacts of recycling fermentates from biogas production. Sander Bruun Søren O. Petersen Lars Stouman Jensen. Composition of fermentates . Application mode of fermentates . C Mineralization O 2 consumption O 2 Distribution N 2 O production. CO 2 evolution.

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WP 4: Environmental impacts of recycling fermentates from biogas production

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  1. WP 4:Environmental impacts of recycling fermentates from biogas production Sander Bruun Søren O. Petersen Lars Stouman Jensen

  2. Department of Plant and Environmental Sciences

  3. Composition of fermentates Application mode of fermentates C Mineralization O2 consumption O2 Distribution N2O production CO2 evolution N mineralization O2 Diffusion N2O emission

  4. Storage experiment with different fermentates • - Experiment at pilot-storage facility for 8-9 months determination of GHG (B. Amon) • 2. GHG and O2 in laboratory soil-fermentate mesocosms • - Fermentates of varying quality applied with different distribution, soil moisture and soil texture etc. • Measurement of CO2 and N2O evolution • Measurement of N2O isotopic distribution • Measurement of O2 distribution with optodes • 15N and 13C labelled substrates /fermentates will be used for tracing distribution around fermentate hot spots (R. Bol) • 2. C sequestration from different fermentates in soil Colums • 3. Modelling of GHG emissions and C sequestration • Validation of a submodel for N2O emissions (Sommer et al. 2004) • Farm model of GHG emissions (M. Chantigny) • Models of C sequestration predicting long-term effects Activities

  5. Treatments 1. laboratory soil-fermentate mesocosms control Layered Mixed manure pF: expression of soil water retention, higher value with lower water content.

  6. 1. Experimental Set Up Excitation filter Incubator at 15-25 °C LEDs Septum for gas sampling Headspace Computer DSLR camera Soil Emission filter Optode foil

  7. Optode images reflecting the temporal-spatial dynamics of O2 distribution in soil Example of results (courtesy of PhD stud. Kun Zhu) Soil surface A B C Manure Application 0 hour 1 hour 2 hours 3 hours 5 hours A: None [O2] (% air saturation) B: Layered Manure layer C: Mixed Fig. 2 Images of O2 contents in soil profiles.

  8. KU: Sander Bruun and Lars Stoumann Jensen PhD: Currently reviewing applications from 26 candidates, extected starting time 1. September. Collaboration with Kun Zhu and Roland Bol AU: Søren O. Petersen PhD: Khagendra Baral starts 1. September Collaboration with Martin Chantiny and Barbera Amon Collaboration with SDU who will supply fermentates and relevant fermentate properties Possibly collaboration with DTU who will supply feedstock and feedstock characteristics Collaboration with Bruna de Souza Morales visiting SDU Department of Plant and Environmental Sciences People and Collaboration

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