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Feasibility of grass co-digestion in an agricultural digester, influence on process parameters and residue composition

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Graskracht, GR3
Abstract
The European Union states that by 2020, 20% of the European energy consumption should come from renewable energy. This study investigated the potential of co-digestion of grass clippings (waste) in a typical Flemish agro-digester characterized by an input of 30% manure, 30% maize silage and 40% side streams. No significant adverse effects in the microbiological functioning of the reactors were detected when 10 to 20% out of the 30% maize input was replaced by grass. However at the highest dosage of grass input, dry matter content and the viscosity of the reactor content increases substantially. These elevated parameters could subsequently be reduced again by enzyme addition in the form of MethaPlus L100, although they remained higher than those of the reference reactor receiving maize. It can be concluded that co-digestion of 20% grass in a typical agricultural digester would not pose any problem if dry matter content and viscosity are improved by the use of an enzyme mixture. This is good news for a region like Flanders, where arable land for (energy) crop production is scarce and where grass wastes remain in many cases unused.
Keywords
grass clippings, Anaerobic digestion, semi-continuous system, agro-digester, mesophilic co-digestion

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Chicago
De Moor, Sofie, Filip Velghe, Isabella Wierinck, Evi Michels, Bart Ryckaert, Alain De Vocht, Willy Verbeke, and Erik Meers. 2013. “Feasibility of Grass Co-digestion in an Agricultural Digester, Influence on Process Parameters and Residue Composition.” In AOG RENEW Meeting, Abstracts.
APA
De Moor, Sofie, Velghe, F., Wierinck, I., Michels, E., Ryckaert, B., De Vocht, A., Verbeke, W., et al. (2013). Feasibility of grass co-digestion in an agricultural digester, influence on process parameters and residue composition. AOG RENEW meeting, Abstracts. Presented at the AOG RENEW meeting.
Vancouver
1.
De Moor S, Velghe F, Wierinck I, Michels E, Ryckaert B, De Vocht A, et al. Feasibility of grass co-digestion in an agricultural digester, influence on process parameters and residue composition. AOG RENEW meeting, Abstracts. 2013.
MLA
De Moor, Sofie, Filip Velghe, Isabella Wierinck, et al. “Feasibility of Grass Co-digestion in an Agricultural Digester, Influence on Process Parameters and Residue Composition.” AOG RENEW Meeting, Abstracts. 2013. Print.
@inproceedings{4082963,
  abstract     = {The European Union states that by 2020, 20\% of the European energy consumption should come from renewable energy. This study investigated the potential of co-digestion of grass clippings (waste) in a typical Flemish agro-digester characterized by an input of 30\% manure, 30\% maize silage and 40\% side streams. No significant adverse effects in the microbiological functioning of the reactors were detected when 10 to 20\% out of the 30\% maize input was replaced by grass. However at the highest dosage of grass input, dry matter content and the viscosity of the reactor content increases substantially. These elevated parameters could subsequently be reduced again by enzyme addition in the form of MethaPlus L100, although they remained higher than those of the reference reactor receiving maize. It can be concluded that co-digestion of 20\% grass in a typical agricultural digester would not pose any problem if dry matter content and viscosity are improved by the use of an enzyme mixture. This is good news for a region like Flanders, where arable land for (energy) crop production is scarce and where grass wastes remain in many cases unused.},
  author       = {De Moor, Sofie and Velghe, Filip and Wierinck, Isabella and Michels, Evi and Ryckaert, Bart and De Vocht, Alain and Verbeke, Willy and Meers, Erik},
  booktitle    = {AOG RENEW meeting, Abstracts},
  keyword      = {grass clippings,Anaerobic digestion,semi-continuous system,agro-digester,mesophilic co-digestion},
  language     = {eng},
  location     = {Kortrijk, Belgium},
  title        = {Feasibility of grass co-digestion in an agricultural digester, influence on process parameters and residue composition},
  year         = {2013},
}