| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Assuming the use of existing bottomless septic tanks widely distributed in Pacific atolls, biological treatment of domestic wastewater using seawater was examined. Anaerobic sequencing batch reactor fed municipal wastewater with the addition of seawater showed organic matter removal efficiencies between 82.4-91.1%. The 16S rRNA gene-based microbial community analysis revealed that sulfate-reducing bacteria belonging to the delta-Proteobacteria and others belonging to the alpha-Proteobacteria play an important role in removing organic matter in the presence of seawater. In addition, over 68% removal ratio of Pb, Zn, and Cu was achieved, largely owing to the formation of metal-sulfide. Moreover, it was found that the addition of seawater dramatically improves power generation in microbial fuel cell system treating municipal wastewater, because of the improvement of electric conductivity in the anode tank.
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