| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
We proposed a new potassium recovery method from wastewater using halophilic archaea. The method consists of concentrating potassium in wastewater with zeolite and recovering high potassium solution with NaCl solution, bioaccumulation of potassium from a potassium solution of high concentration using a cheap organic source such as waste activated sludge, and recovery of potassium chloride crystals from incinerated ash of the cells.
For potassium concentration from wastewater with zeolite, a pilot plant experiment using real treated domestic wastewater was conducted and confirmed. We succeeded in bioaccumulation of 20% potassium per bacterial cell by culturing the halophilic archaea H. mediterranei with highly concentrated NaCl using activated sludge as a substrate. After bioaccumulation of potassium in H. mediterranei cells, it was possible to selectively recover KCl crystal by melt crystallization method from incinerated ash of the cells.
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