| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2017: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Outline of Final Research Achievements |
In the survey of several municipal wastewater treatment plants in Japan, the authors found that the abundance of filamentous bacteria Kouleothrix spp. in activated sludge biomass often caused the problem of bulking, where the solid and liquid phases of mixed liquor fail to separate rapidly and effectively in secondary settling tanks. The survey also indicated that the introduction of nitrogen removal process inhibited the growth of Kouleothrix spp. Moreover, the statistical analysis of possible relationships between Kouleothrix high abundance and operational parameters of a wastewater treatment plant revealed possible clues as to how its growth might be controlled in treatment plants.
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