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MASS TRANSFER MECHNISM AND SEPARATION CHARACTERISTICS OF NANOFILTRATION MEMBRANES UNDER VERY LOW PRESSURE OPERATION AND WITH MIXTURE OF DISSOLVED SUBSTANCES INTERACTION

Research Project

Project/Area Number 09450196
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Civil and environmental engineering
Research InstitutionThe University of Tokyo

Principal Investigator

YAMAMOTO Kazuo  Environmental Science Center, The University of Tokyo, Professor, 環境安全研究センター, 教授 (60143393)

Co-Investigator(Kenkyū-buntansha) TAKIZAWA Satoshi  Dept. of Urban Eng., The University of Tokyo, Assoc. Professor, 工学系研究科, 助教授 (10206914)
URASE Taro  Dept. of Civil Eng., Tokyo Institute of Technology, Assoc. Professor, 工学系研究科, 助教授 (60272366)
大瀧 雅寛  東京大学, 大学院・工学系研究科, 講師 (70272367)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥11,300,000 (Direct Cost: ¥11,300,000)
Fiscal Year 1999: ¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1998: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1997: ¥3,800,000 (Direct Cost: ¥3,800,000)
Keywordsnanofiltration / low-pressure operation / multi le dissolved substances / separation characteristics / river water / groundwater / arsenic / THMFP / ナノろ過 / 逆浸透法 / 水処理 / 下水再利用 / 分離機構
Research Abstract

This study aims to elucidate mass transfer and separation characteristics through NF membranes especially at operations under very low pressure and with mixture of dissolved substances interaction.
As the last year of the research periods, a pilot experiment has been carried out at Tamagawa Water Purification Plant, Tokyo. Nanofiltration characteristics of river water was investigated in details. A NF membrane with a high salt retention gave both a high retention of THM precursors and a high retention of dissolved ions for more than a half year operation. The combined effects of size-exclusion, electric charge, and affinity could explain the mechanism of membrane separation. In addition, it is shown that a modified Extended Nernst Plank Equation could well explain the separation of most of dissolved ions by a positively charged membrane. However, a discrepancy between theoretical and experimental was observed for sulfate ions, a further improvement of the model is required for the ion mixture of river water.
A manually driven nanofiltration system has been applied to arsenic removal from groundwater in Bangladesh. The field tests in the rural area has proven the system is technically feasible even at a very low pressure of 3 atm. However, the groundwater heavily contaminated with arsenic typically contains trivalent arsenic compounds and NF gives a lower retention of trivalent arsebnic than that of pentavalent one, suggesting a need of pre-oxidation process prior to NF. These couter measures are easily rationalized by mechanism-oriented understandings as a result of this study.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] M. Thanuttamavong, T. Urase, K. Yamamoto: "A study on nanofiltration pilot plant of surface water for drinking water for drinking water production"Proc. Of IAWQ International Specialized Conference on Membrane Techology in Environ mental Margement Tokyo. 448-451 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. L. Oh, T. Urase, H. Kitawaki M. H. Rhahrnan. M. M. Rahman: "Modeling of arsenic rejection considering affinity and steric hidrance effect in manufiltration membranes"IAWQ Asian regional conference Taiwan. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Jeong-lk Oh, Taro Urase and Kazuo Yamamoto: "A study on arsenic rejection in groundwater with ultra-low pressure nanofiltration membrane process"Proc. Annual Meeting of Korea Society on Environ. Engineering, Pusan, Oct.. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Thanuttamavong, T. Urase and K. Yamamoto: "A study on nanofiltration pilot plant of surface water for drinking water production"Proc. IAWQ Int. Specialized Conf. on Membrane Tech. In Environmental Management, Tokyo, Nov. 1999. 448-451 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Thanuttamavong, T. Urase, and K. Yamamolto: "Difference in rejection behaviour between trihalomethane precusors and inorganic salts by ultra low pressure nanofiltration"Proc. Environ. Eng. Forum, JSCE. 36. 61-63 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. I. Oh, T. Urase, K. Kitawaki, M. H. Rhaman, M. M. Rhaman, and K. Yamamoto: "Modeling of aresenic rejection considering affinity and steric hinderence effect in nanofiltration membranes"Proc. IAWQ Asian Water Qual '99, Oct. 1999. Vol. 1. 680-685 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Jeong-ik Oh, Taro Urase, Kazuo Yamamoto: "A study on arsenic rejection in ground water with ultra low-pressure nanofiltration membrane process"大韓環境工学会年会講演集. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M. Thanuttamavong, T. Urase,K. Yamamoto: "A study on nanofiltration pilot plant of surface water for drinking water production"Proc. of IAWQ International Specialized Conference Membrane Technology in Environmental Management,Tokyo. 448-451 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M. Thanuttamavong, T. Urase,K. Yamamoto: "Difference in rejection behavior between trihalomethane precursors and inorganic salts by ultra low pressure nanofiltration"土木学会環境フォーラム講演集. 36. 61-63 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] J. I. Oh, T. Urase, H. Kitawaki, M. H. Rhahman, M. M. Rahman, K. Yamamoto: "Modeling of arsenic rejection considering affinity and steric hindrance effect in nanofiltration membranes"IAWQ Asian regional conference, Taiwan. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 呉政益ら: "ナノろ過プロセスでの種類および化学形態の異なる金属の阻止特性" 環境工学研究論文集. 35. 255-263 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Urase ら: "Effect of pH on rejection of different speaes of arsenic by nanofiltration" Desalination. 117. 11-18 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] C.Ratanatamskul et al.: "Prediction behavior in rejection of pollutants in ultra low pressure nanofiltration" Water Science and Technology. (Accepted). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 呉 政益ら: "ナノろ過法による廃棄物処分場浸出水の処理における重金属の挙動" 廃棄物学会研究発表講演集. 8. 775-777 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 江川 健ら: "芳香族のナノろ過膜阻止特性への置換基の影響" 水環境学会年会講演集. 31. 155 (1997)

    • Related Report
      1997 Annual Research Report

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

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