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Recovery and recycling of phosphorous from aquatic ecosystems by use of the salt-tolerant green algae Dunaliella and chitosan

Research Project

Project/Area Number 09650841
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 反応・分離工学
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

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)

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)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
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)
Keywordsmicro-algae / Dunaliella / photosynthesis / polyphosphates / bio-concentration / fixation of P
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.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Takahiro Suzuki: "Influence of Environmental Factors on Phosphorous Content in the Marine Microalga Dunaliella" Toxicological and Environmental Chemistry. 64. 173-181 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takahiro Suzuki: "Effect of Procaine Concentration on the Growth of Some Species of Microalgae and Cyanobacteria" Journal of Pharmacy and pharmacology. 50(Suppl.). 133-133 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takahiro Suzuki: "Influence of Environmental Factors on Phosphorous Content in the Marine Microalga Dunaliella" Toxicological and Environmental Chemistry. 64. 173-181 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takahiro Suzuki: "Effect of Procaine Concentration on the Growth of Some Species of Microalgae and Cyanobacteria" Journal of Pharmacy and Pharmacology. 50(Suppl.). 133 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takahiro Suzuki: "Influence of Environmental Factors on Fhosphorous Content in the Marine Microalga Dunaliella" Toxicological and Environmental Chemistry. 64. 173-181 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Takahiro Suzuki: "Effect of Procaine Concentration on the Growth of Some Species of Microalgae and Cyanobacteria" Journal of Pharmacy and Pharmacology. 50(Suppl.). 133-133 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Takahiro Suzuki: "Intluence of Environmental Factors on Phosphorous Content in the Marine Microalga Dunaliella" Toxicological and Environmental Chemistry. 64. 173-181 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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