Crude glycerin in anaerobic co-digestion of dairy cattle manure increases methane production

  • Silvana Simm Federal University of Grande Dourados
  • Ana Carolina Amorim Orrico Federal University of Grande Dourados
  • Marco Antonio Previdelli Orrico Junior Federal University of Grande Dourados
  • Natália da Silva Sunada Federal University of Grande Dourados
  • Alice Watte Schwingel Federal University of Grande Dourados
  • Mônica Sarolli Silva de Mendonça Costa State University of West Paraná; Dept. of Agricultural Engineering
Keywords: glycerol, biogas, anaerobic digestion, solids

Abstract

Anaerobic digestion of crude glycerin (CG) along with animal waste has been an excellent option for increasing the production of biogas and methane to achieve efficiency in the treatment of both residues. This study aimed to evaluate improvements in specific productions of biogas and methane, reductions in solid and fibrous components in substrates prepared with dairy cattle manure and CG (containing 14 % glycerol). With these residues, experimental substrates were prepared and placed in 25 batch digesters. Initial content of the TS in the influent was 4 % and CG was added in increasing doses (0, 5, 10, 15 and 20 % relative to total solids (TS) of the influent). Results were submitted to ANOVA and orthogonal contrasts to assess the effects of linear and quadratic order and thereby estimate the optimal CG doses through the adjusted models. The highest values for specific production of methane (0.19 and 0.26 L g−1 of TS and volatile solids (VS) added, respectively) were reached with the CG inclusions of 6 and 8 %, respectively. Total production of biogas with the inclusion of 6 % CG was 11 % higher when compared to the control treatment. The largest reduction in VS (48 %) was achieved with the addition of 4 % CG. Addition of CG at levels between 3 and 8 % improved the efficiency of the process of anaerobic digestion with dairy cattle manure.

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Published
2017-06-01
How to Cite
Simm, S., Orrico, A., Orrico Junior, M., Sunada, N., Schwingel, A., & Mendonça Costa, M. (2017). Crude glycerin in anaerobic co-digestion of dairy cattle manure increases methane production. Scientia Agricola, 74(3), 175-179. https://doi.org/10.1590/1678-992x-2016-0057
Section
Agricultural Engeneering