| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2021: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2020: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Outline of Final Research Achievements |
We aim to develop a novel clean-up system for arsenic contamination of groundwater derived from natural occurrences in the Mekong Delta area, including Vietnam and Cambodia. This system should be energy-saving and low-cost. We adopted coke as a carrier for microbes that oxidize arsenite to arsenate. In the lab-scale experiment, we showed that arsenite binds to coke, is oxidized to arsenate, and the resultant arsenate is released from coke. The indigenous ferrous ions will bind to the arsenate and co-precipitated. We constructed an arsenic removal pilot plant in Cambodia and continuously operated it. We successfully reduced the arsenic concentration to 50 ppb, the water quality standard for arsenic in Cambodia.
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