Minimization of greenhouse gas emission by application of anaerobic digestion process with biogas utilization

Hidenari Yasui, Kazuya Komatsu, Rajeev Goel, R. Matsuhashi, A. Ohashi, H. Harada

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


To assess the impact on greenhouse gas emission, different process schemes for municipal sludge treatment were evaluated based on the data from pilot-scale experiments and review of annual operation reports. A modified anaerobic digestion process with partial ozonation of digested sludge to improve biological degradability and the conventional anaerobic digestion process were compared with respect to the energy demand in each process schemes. Options for beneficial use of biogas included (1) application of biogas for power production and (2) recovery as an alternative to natural gas utilization. The analysis indicated that the partial ozonation process with power production led to minimal greenhouse gas emission because the extra energy production from this scheme was expected to cover all of the energy demand for the plant operation. Moreover, the final amount of dewatered sludge cake was only 40% of that expected from the conventional process, this significantly minimizes the potential for greenhouse gas emission in the subsequent sludge incineration processes.

Original languageEnglish
Pages (from-to)545-552
Number of pages8
JournalWater Science and Technology
Issue number1-2
Publication statusPublished - 2005


  • Anaerobic digestion
  • Greenhouse gas emission
  • Incineration
  • Kyoto protocol
  • LCA
  • Ozonation

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology


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