Enhancement of Sewage Sludge Digestion by Co-digestion with Food Waste and Swine Waste

Yongtae Ahn, Wontae Lee, Seoktae Kang, Sang Hyoun Kim

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The anaerobic co-digestion of sewage sludge and other organic waste is an attractive method for both waste treatment and biogas production. In this study, we examined the optimal substrate mixing ratio in co-digestion of sewage sludge, swine waste, and food waste using the response surface methodology. The single digestion of sewage sludge produced 138 mL CH4/g total solids (TS) with 35% chemical oxygen demand removal. The co-digestion with food waste and swine waste increased the methane yield to 294 mL/g TS under the optimal mixing ratio of 1:0.39:1 (sewage sludge:food waste:swine waste). The statistical analysis of the experimental data indicated a synergistic effect in the mixing of food waste and swine waste. This study showed that co-digestion of the organic wastes would be a feasible and economic approach to retrofit conventional anaerobic digesters.

Original languageEnglish
Pages (from-to)2421-2430
Number of pages10
JournalWaste and Biomass Valorization
Issue number6
Publication statusPublished - 2020 Jun 1

Bibliographical note

Funding Information:
Acknowledgements The authors would like to acknowledge the financial support of National Research Foundation under “Next Generation Carbon Upcycling Project” (Project No. 2017M1A2A2043150) of the Ministry of Science and ICT, Republic of Korea.

Publisher Copyright:
© 2019, Springer Nature B.V.

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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