| Project/Area Number |
09650841
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
反応・分離工学
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
SUZUKI Takahiro Tokyo Institute of Technology Research Laboratory of Resources Utilization Associate Professor, 資源化学研究所, 助教授 (30192131)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIDA Masaru Tokyo Institute of Technology Research Laboratory of Resources Utilization Profe, 資源化学研究所, 教授 (10016735)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | micro-algae / Dunaliella / photosynthesis / polyphosphates / bio-concentration / fixation of P |
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| Research Abstract |
A basic study on the development of a recovery and recycling process for phosphorous (P) from aquatic ecosystems by use of the salt-tolerant green algae Dunaliella and chitosan was performed. The effects of various combinations of environmental or operational factors on P content in the Dunaliella cells were examined, using laboratory cultures under controlled conditions. The factors examined were the culture temperature, light intensity, CO_2 concentration in flushing gas, P, NaCl, nitrogen and Ca^<2+> concentration in the culture. The experimental system of the factors and the measured responses of algal growth rate and P content was modeled and analyzed based on the response surface method. The model obtained revealed that the intracellular P content in D.parva was highly dependent on the P concentration in the pre-culture medium in the case of the P concentration in the culture was relatively low. It was also found that procaine hydrochloride was useful to increase the growth of the algal cells. In the next step, the P recovery in terms of physico-chemical treatments from the harvested algal cells was studied. The results showed the Ca(0H)_2 or Al_2(SO_4)_3 treatment for the polyphosphates in the algal cells was effective to precipitate phosphate salt. The biopolymers, natural chitin and chitosan, were not so effective at solid removal. Further study on the use of modified chitosan such as iron chitosan will be required.
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