| Budget Amount *help |
¥24,180,000 (Direct Cost: ¥18,600,000、Indirect Cost: ¥5,580,000)
Fiscal Year 2019: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Fiscal Year 2018: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2017: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Outline of Final Research Achievements |
Activated sludge, which is a complex microbial community composed of thousands kinds of microbes, has been used for wastewater treatment for over 100 years. Yet, because of its complexity, wastewater treatment mechanisms in activated sludge has remained unclear. This study aimed to decipher “who does what” in activated sludge. One of the findings of this study is that small minority nitrifiers can govern the overall performance of the activated sludge bioreactors, via interspecific interactions. Disagreement between population abundance and functional importance in the ecosystem was demonstrated; this uncertainty may contribute to the unpredictable deterioration of activated sludge bioreactors. Another finding is important role of predatory bacteria in controlling biomass of activated sludge. Predatory bacteria can contribute to reduce excessively grown microbes in activated sludge; resulting in reduction of microbial wastes.
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