Oceans as bioenergy pools for methane production using activated methanogens in waste sewage sludge

Nazlina Haiza Mohd Yasin, Azusa Ikegami, Thomas K. Wood, Chang Ping Yu, Tetsuya Haruyama, Mohd Sobri Takriff, Toshinari Maeda

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The dissolved CO2 that causes ocean acidification has great potential for bioenergy production. In this study, we demonstrate that activated methanogens in waste sewage sludge (WSS) are useful for converting bicarbonate in seawater into methane. These activated methanogens were adapted in different seawater sources for methane production through repeated batch experiments that resulted in an increase of 300–400 fold in the methane yield. During these repeated batch experiments, the microbial communities in WSS adapted to the high salinity of seawater to generate more methane. Microbial community analysis showed the dominance of Achromobacter xylosoxidans, Serrati sp. and methanogens including Methanobacterium sp., Methanosarcina sp., and Methanosaeta concillii. Using a 13C-labeled isotope, we demonstrate that 81% of the methane is derived from microbial conversion of NaH13CO2 in artificial seawater. Therefore, this study shows that oceans, with the largest surface area on Earth, have a potential as a substrate for methane energy production via an acclimated consortium approach.

Original languageEnglish (US)
Pages (from-to)399-407
Number of pages9
JournalApplied Energy
StatePublished - 2017

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering
  • Energy(all)
  • Management, Monitoring, Policy and Law


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