| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
We investigated whether algae spontaneously generated in aquarium or algae growing at a water treatment plant in Itoman City in Okinawa Prefecture can reduce hardness and can reduce nitrate nitrogen concentration in groundwater with high nitrate nitrogen concentration. Both algae could reduce the hardness. Hardness decreased at the time of light irradiation and did not decrease at dark place. The pH of water increased at the time of light irradiation and did not change at dark place. From this, it was found that the hardness decreased as the algae absorbed the CO2 of calcium bicarbonate dissolved in water when receiving photosynthesis. Nitrate nitrogen concentration also decreased as hardness. Each algae was Aphanochaete magnum, Cladophora albida.
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