Ammonia–methane two-stage anaerobic digestion of dehydrated waste-activated sludge

  • Yutaka Nakashimada
  • Yasutaka Ohshima
  • Hisao Minami
  • Hironori Yabu
  • Yuzaburo Namba
  • Naomichi Nishio
Environmental Biotechnology

Abstract

The study investigated methane production from dehydrated waste-activated sludge (DWAS) with approximately 80% water content under thermophilic conditions. The repeated batch-wise treatment of DWAS using methanogenic sludge unacclimated to high concentrations of ammonia, increased the ammonia production up to 7,600 mg N per kilogram total wet sludge of total ammonia concentration, and stopped the methane production. Investigation revealed that the loading ratio of DWAS for methanogenic sludge influences anaerobic digestion. Methane production significantly decreased and ammonia concentration increased with the increase in loading ratio of DWAS. Since the semicontinuous culture revealed that approximately 50% of organic nitrogen in DWAS converted to ammonia at sludge retention time (SRT) after 4 days at 37°C and 1.33 days at 55°C, the previous stripping of the ammonia produced from DWAS was carried out. The stripping of ammonia increased methane production significantly. This ammonia–methane two-stage anaerobic digestion demonstrated a successful methane production at SRT 20 days in the semicontinuous operation using a laboratory-scale reactor system.

Keywords

Dehydrated waste-activated sludge Ammonia stripping Anaerobic digestion 

Notes

Acknowledgements

This investigation was supported by a grant from Hiroshima Prefectural Institute of Science and Technology.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Yutaka Nakashimada
    • 1
    • 2
  • Yasutaka Ohshima
    • 1
  • Hisao Minami
    • 1
  • Hironori Yabu
    • 2
  • Yuzaburo Namba
    • 2
  • Naomichi Nishio
    • 1
    • 2
  1. 1.Department of Molecular Biotechnology, Graduate School of Advanced Sciences of MatterHiroshima UniversityHigashi-HiroshimaJapan
  2. 2.Hiroshima Prefectural Institute of Industrial Science and TechnologyHigashi-HiroshimaJapan

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