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Comparison of high-solids to liquid anaerobic co-digestion of food waste and green waste

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Author

Summary, in English

Co-digestion of food waste and green waste was conducted with six feedstock mixing ratios to evaluate biogas production. Increasing the food waste percentage in the feedstock resulted in an increased methane yield, while shorter retention time was achieved by increasing the green waste percentage. Food waste/green waste ratio of 40:60 was determined as preferred ratio for optimal biogas production. About 90% of methane yield was obtained after 24.5 days of digestion, with total methane yield of 272.1 mL/g VS. Based the preferred ratio, effect of total solids (TS) content on co-digestion of food waste and green waste was evaluated over a TS range of 5–25%. Results showed that methane yields from high-solids anaerobic digestion (15–20% TS) were higher than the output of liquid anaerobic digestion (5–10% TS), while methanogenesis was inhibited by further increasing the TS content to 25%. The inhibition may be caused by organic overloading and excess ammonia.

Publishing year

2014

Language

English

Pages

215-221

Publication/Series

Bioresource Technology

Volume

154

Document type

Journal article

Publisher

Elsevier

Topic

  • Production Engineering, Human Work Science and Ergonomics

Keywords

  • High-solids anaerobic digestion
  • Co-digestion
  • Food waste
  • Green waste
  • Biogas

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-2976