マイクロバブル浮上分離による酸化鉄微粒子の除去 Removal of Iron Oxide Fine Particles from Waste Water Using Microbubble Flotation

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A novel microbubble flotation using a spiral-liquid-flow type microbubble generator was developed to recover the iron oxide fine particles from the suspension containing dilute surfactants. Although the suspended iron oxide particles were hardly removed from suspension using other aerators such as a single orifice and a glass ball filter, the microbubble generator achieved 90% recovery of the particles in 60 minutes. In bulk liquid, both surfaces of microbubbles and iron oxide particles became electrically charged. When pH was controlled between 4.4 and 7.8, the surface of microbubbles was charged negatively and the surface of iron oxide particles was charged positively. Therefore, the microbubbles and the particles were attracted each other. At pH = ca. 5 the microbubbles adsorbed well the iron oxide particles. In the foam layer at the top of flotation column, the particles were trapped and removed from the bulk liquid. The recoverability depended on the degree of ionization and the concentration of added surfactant. In the present system, the concentration of surfactant was suitable to be only 1 to 2 % of the critical micelle concentration to achieve the highest recoverability of suspended particles from the suspension. Moreover, to understand the mechanism of the iron oxide particle separation using microbubble flotation, the novel kinetic model which considers the adsorption and the release coefficients was proposed. The microbubble flotation model could estimate well the removal of iron oxide particles from the suspension.

収録刊行物

  • 混相流研究の進展 : 年会講演会論文精選集 = Progress in multiphase flow research  

    混相流研究の進展 : 年会講演会論文精選集 = Progress in multiphase flow research (2008), 43-50, 2008-06-15 

    THE JAPANESE SOCIETY FOR MULTIPHASE FLOW

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各種コード

  • NII論文ID(NAID)
    10021154330
  • NII書誌ID(NCID)
    AA12204080
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    18815804
  • NDL 記事登録ID
    9553799
  • NDL 雑誌分類
    ZM17(科学技術--科学技術一般--力学・応用力学)
  • NDL 請求記号
    Z74-E929
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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