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首页> 外文期刊>Environmental Science & Technology >The Role of Polymer in Improving Floe Strength for Filtration
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The Role of Polymer in Improving Floe Strength for Filtration

机译：聚合物在提高浮选过滤强度方面的作用

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摘要

Dosing polymer to improve floe characteristics is a widely practiced method in water treatment to improve floe strength, and there is strong operational evidence snowing the benefit of polymer dosing. However, there is a paucity of information on how polymer operates in terms of quantifying the resulting floe size and strength over different size scales. A dual particle sizing approach was used to monitor large floe that contain most of the sludge volume and small floe that can cause downstream treatability problems for systems with and without polymer dosing. The polymer investigated was a slightly anionic polyacrylamide dosed in water collected post dissolved air flotation at concentrations of 0-0.03 mg L~(-1). With increasing polymer dose, median floe size increased from 228 to 325 μm. Roc responses to increased shear rate showed that polymer dosing increased resistance to floe break-up. While all of the floes showed high potential to regrow, regrowth was greatest in polymer-dosed systems, where floes exceeded the size that they had reached previously. Increasing the dose of polymer showed increased removal of small panicles (<8 μm) showing that polymer was able to effectively remove particles that are liable to cause downstream problems.
机译：给聚合物添加絮凝剂以改善絮凝特性是在水处理中提高絮凝强度的一种广泛实践的方法，并且有很强的运行证据证明了下雪聚合物絮凝剂的好处。然而，关于如何在不同尺寸规模上量化所得的絮凝物尺寸和强度方面，关于聚合物如何操作的信息很少。使用双重颗粒筛分方法来监测包含大部分污泥体积的大絮凝物和小絮凝物，这些絮凝物会在有或没有聚合物给料的系统中引起下游可处理性问题。所研究的聚合物是在溶解气浮后收集到的水中添加的少量阴离子聚丙烯酰胺，浓度为0-0.03 mg L〜（-1）。随着聚合物剂量的增加，中值絮凝物尺寸从228μm增加到325μm。 Roc对剪切速率增加的响应表明，聚合物加料增加了对絮凝物破裂的抵抗力。尽管所有的絮凝物都显示出很高的再生潜力，但在聚合物给料系统中，再生絮凝是最大的，在这些体系中，絮凝物超过了以前达到的大小。聚合物剂量的增加显示出对较小圆锥花序（<8μm）的去除增加，表明聚合物能够有效去除易于引起下游问题的颗粒。

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  • 来源
    《Environmental Science & Technology》 |2010年第16期|p.6443-6449|共7页
  • 作者

    LARA FABRIZI; BRUCE JEFFERSON; SIMON A. PARSONS; ANDREW WETHERILL; PETER JARVIS;

  • 作者单位

    Centre for Water Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, U.K.;

    rnCentre for Water Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, U.K.;

    rnCentre for Water Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, U.K.;

    rnYorkshire Water, Halifax Rd, Bradford, BD6 2LZ, U.K.;

    rnCentre for Water Science, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, U.K.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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