• Title/Summary/Keyword: 철입자

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Adhesion and Transport of Bacteria in Iron-coated Media (철코팅 여재에서 박테리아의 부착 및 이동)

  • Lee, Chang-Gu;Park, Seong-Jik;Choi, Nag-Choul;Kim, Song-Bae
    • Journal of Korean Society of Environmental Engineers
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    • v.29 no.7
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    • pp.833-838
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    • 2007

  • In this study, adhesion and transport of bacteria in positively-charged media was investigated with batch and column experiments. Bacterial species used in this study was Escherichia coli ATCC 11105(length: 2.2 ${\mu}m$, diameter: 0.6 ${\mu}m$) and media used were quartz sand(particle size distribution: 0.5-2.0 mm, mean diameter: 1.0 mm) and iron-coated sand. Batch results indicate that bacterial adhesion increased as the content of iron-coated media increased. At iron-coated media 0%(quartz sand 100%), around 46% of bacteria was adhered to media while at iron-coated media 100%(quartz sand 0%) about 97% was attached. Column results also show that bacterial adhesion was enhanced with an increase of iron-coated media content. As the iron-coated media content increased from 0 to 100%, bacterial adhesion increased from 8 to 94%. The experimental results demonstrate that positively-charged media could influence transport of bacteria in porous media.

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Suspension Polymerization Conditions of Vinyl Pivalate on Size Distribution of Poly(vinyl pivalate) Microspheres (폴리피발산비닐 구형입자의 크기 분포에 영향을 미치는 피발산비닐의 현탁중합 조건)

  • 류원석;박찬식;염정현;지병철
    • Proceedings of the Korean Fiber Society Conference
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    • 2001.10a
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    • pp.211-214
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    • 2001

  • 최근 입자를 이용한 색전술의 재료로서 광범위하게 사용되는 폴리비닐알코올(poly (vinyl alcohol) (PVA)) 입자는 전형적인 혼성배열(atactic)이다[1]. 제조된 PVA 입자가 고내구성 및 혈액내에서 안정성을 나타내기 위해서는 중합된 PVA 입자의 분자량 뿐만 아니라 교대배열성(syndiotacticity)도 커야 한다. 교대배열기(sydiotactic group)를 풍부하게 함유하고 있는 고분자량의 PVA를 제조하기 위해서는 고분자량의 교대배열성 전구체가 얻어지도록 입체장애를 일으키는 에스테르기를 보유하고 있는 단량체를 사용하거나 중합방법을 개선하는 것이 필요하다. (중략)

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