The use of co-digested solid fraction as feedstock for biogas plants

  • Elio Dinuccio | elio.dinuccio@unito.it Department of Agriculture, Forestry and Food Science, University of Torino, Grugliasco (TO), Italy.
  • Fabrizio Gioelli Department of Agriculture, Forestry and Food Science, University of Torino, Grugliasco (TO), Italy.
  • Dalibor Cuk Department of Agriculture, Forestry and Food Science, University of Torino, Grugliasco (TO), Italy.
  • Luca Rollè Department of Agriculture, Forestry and Food Science, University of Torino, Grugliasco (TO), Italy.
  • Paolo Balsari Department of Agriculture, Forestry and Food Science, University of Torino, Grugliasco (TO), Italy.

Abstract

A comparative study was set up in order to assess the technical feasibility of the long-term reuse of the mechanically separated co-digested solid fraction as a feedstock for anaerobic digestion plants (ADP). The biogas yields of two feedstock mixtures (A and B) were assessed in mesophilic conditions (40°C±2°C) using 6 lab-scale continuous stirredtank reactors. Feedstock mixture A (control) consisted of pig slurry (70%), farmyard manure (4%), sorghum silage (12%) and maize silage (14%). Feedstock mixture B was the same as the control plus the solid fraction derived from the mechanical separation of the output raw codigestate collected from the reactors. All reactors were fed simultaneously, three times a week, over a period of nine month. According to the study results, the reuse of the co-digested solid fraction as feedstock for ADP could increase the methane yield by approximately 4%. However, ADP efficiency evaluation (e.g., daily yield of methane per m3 of digester) suggests limiting this practice to a maximum time period of 120 days.

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Published
2014-02-28
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Original Articles
Keywords:
anaerobic digestion, biogas, mechanical separation, solid fraction.
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How to Cite
Dinuccio, E., Gioelli, F., Cuk, D., Rollè, L., & Balsari, P. (2014). The use of co-digested solid fraction as feedstock for biogas plants. Journal of Agricultural Engineering, 44(4), 153-159. https://doi.org/10.4081/jae.2013.208