| Project/Area Number |
10450312
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物・生体工学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
OHTAKE Hisao FACULTY OF ENGINEERING, HIROSHIMA UNIVERSITY, PROFESSOR, 工学部, 教授 (10127483)
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| Co-Investigator(Kenkyū-buntansha) |
TAKIGUCHI Noboru GRADUATE SCHOOL OF ADVANCED SCIENCES OF MATTER, HIROSHIMA UNIVERSITY, ASSISTANT, 大学院・先端物質科学研究科, 助手 (20304462)
IKEDA Tsukasa FACULTY OF ENGINEERING, HIROSHIMA UNIVERSITY, ASSOCIATE PROFESSOR, 工学部, 助教授 (40151295)
KURODA Akio GRADUATE SCHOOL OF ADVANCED SCIENCES OF MATTER, HIROSHIMA UNIVERSITY, ASSOCIATE PROFESSOR, 大学院・先端物質科学研究科, 助教授 (50205241)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥10,700,000 (Direct Cost: ¥10,700,000)
Fiscal Year 2000: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1999: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1998: ¥4,400,000 (Direct Cost: ¥4,400,000)
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| Keywords | polyphosphate / phosphorus recycling / biological phosphate removal / biophosphorite / ポリリン酸顆粒 / 生物脱リン / 富栄養化 / 資源問題 / 好気嫌気法 / バイオリン / 活性汚泥 / 細菌 / 遺伝子 / 環境バイオテクノロジー |
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| Research Abstract |
Phosphorus in wastewaters causes environmental pollution. On the other hand, phosphorus is essential in fertilizers for food production. However, natural phosphorus resources are being dissipated. The purpose of this research is to develop a bioprocess for recovering phosphorus from activated sludge, intending to prevent environmental pollution and to avert a crisis in phosphorus availability. In enhance biological phosphate removal, sludge bacteria accumulate large quantities of polyphosphate (polyP). The polyP could be released from activated sludge simply by heating at 70oC for one or two h. Released polyP could be easily precipitated by the addition of calcium chloride without pH control. The phosphorus content of the precipitates surpassed those of natural phosphorite deposits (NPD). Conversely, they had a relatively low calcium content, when compared with those of NPD.The bench-scale wastewater system, coupled with a process for phosphorus recovery, showed the high, stable performance for at least two months of operation. The present system will make a great contribution to both phosphorus recycling and eutrophication control.
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