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 journalArticle

2 Citations (Scopus)

Abstract

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
Pages (from-to)399-407
Number of pages9
JournalApplied Energy
Volume202
DOIs
Publication statusPublished - 15 Sep 2017

Fingerprint

Methanogens
Sewage sludge
bioenergy
Methane
methane
Seawater
ocean
seawater
microbial community
Acidification
bicarbonate
Isotopes
sewage sludge
surface area
experiment
Earth (planet)
Experiments
isotope
fold
salinity

Keywords

  • Carbon dioxide
  • Methane
  • Methanogens
  • Ocean acidification
  • Waste sewage sludge

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Energy(all)

Cite this

Oceans as bioenergy pools for methane production using activated methanogens in waste sewage sludge. / Mohd Yasin, Nazlina Haiza; Ikegami, Azusa; Wood, Thomas K.; Yu, Chang Ping; Haruyama, Tetsuya; Takriff, Mohd Sobri; Maeda, Toshinari.

In: Applied Energy, Vol. 202, 15.09.2017, p. 399-407.

Research output: Contribution to journalArticle

Mohd Yasin, Nazlina Haiza ; Ikegami, Azusa ; Wood, Thomas K. ; Yu, Chang Ping ; Haruyama, Tetsuya ; Takriff, Mohd Sobri ; Maeda, Toshinari. / Oceans as bioenergy pools for methane production using activated methanogens in waste sewage sludge. In: Applied Energy. 2017 ; Vol. 202. pp. 399-407.
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