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Why do humic substances inhibit the efficiency of water treatment process?

Research Project

Project/Area Number 15K12236
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Modeling and technologies for environmental conservation and remediation
Research InstitutionUniversity of Tsukuba

Principal Investigator

YAMASHITA Yuji  筑波大学, 生命環境系, 助教 (30543227)

Co-Investigator(Renkei-kenkyūsha) ADACHI Yasuhisa  筑波大学, 生命環境系, 教授 (70192466)
Project Period (FY) 2015-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords水処理 / 凝集効率 / カチオン性高分子凝集剤 / 腐植物質 / 凝集 / 水環境 / ブラウン運動 / 電気泳動移動度
Outline of Final Research Achievements

In order to clarify the effect of humic substances on the aggregation process of colloidal particles induced by cationic polymer flocculants, thickness of polymer adsorption layer, surface charge characteristics and aggregation rate in the optimal condition were investigated on the presence or absence of an anionic polymer, which were used as model humic substances. It was shown that the adsorption layer of the polymer flocculant formed on the particle surface remarkably shrank when the anionic polymer was added. It was also found that the electrophoretic mobility, which was almost zero under the optimum aggregation condition, increased with an increase of the added amount of the anionic polymer, and the aggregation rate decreased accordingly. It is inferred that the shrinkage of the polymer adsorption layer and the change of the surface charge characteristics might be factors of the aggregation inhibition mechanism by the anionic polymer.

Report

(3 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • Research Products

    (5 results)

All 2017 2016 Other

All Presentation (4 results) (of which Int'l Joint Research: 2 results) Remarks (1 results)

  • [Presentation] カチオン性有機凝集剤によるコロイド粒子の凝集効率に対するアニオン性高分子の影響2017

    • Author(s)
      田中脩磨,山下祐司,足立泰久
    • Organizer
      日本水環境学会
    • Place of Presentation
      熊本大学(熊本県熊本市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] イモゴライト-フミン酸複合体の表面自由エネルギーの解析および疎水性発現のメカニズム2017

    • Author(s)
      梅本陽平,山下祐司,足立泰久
    • Organizer
      日本腐植物質学会
    • Place of Presentation
      名城大学(愛知県名古屋市)
    • Related Report
      2016 Annual Research Report
  • [Presentation] Transport behavior of humic acids in porous media―effects of pH, electrolyte concentration and cation valency2016

    • Author(s)
      Yuji Yamashita, Yasuhisa Adachi
    • Organizer
      International Humic Substances Society
    • Place of Presentation
      Kanazawa University, Kanazawa, Ishikawa, Japan
    • Year and Date
      2016-09-12
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Surface charge property of synthetic imogolite-humic acids complex and wettability of the thin layer2016

    • Author(s)
      Yohei Umemoto, Yasuhisa Adachi, Yuji Yamashita
    • Organizer
      International Humic Substances Society
    • Place of Presentation
      Kanazawa University, Kanazawa, Ishikawa, Japan
    • Year and Date
      2016-09-12
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 筑波大学・山下研究室

    • URL

      http://yujiyamashita.wixsite.com/laboratory/page3

    • Related Report
      2016 Annual Research Report

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Published: 2015-04-16   Modified: 2018-03-22  

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