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Unidirectional Freezing of Waste-Activated Sludges: Effects of Freezing Speed

机译:废物活化污泥的单向冷冻:冷冻速度的影响

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摘要

In this work, we employ unidirectional freezing of waste-activated sludge to investigate the effects of freezing speed on the sludge performance including filterability, zone settling, and floc density versus size relationships. With a high freezing speed, no global particle migration occurs, but the sludge filterability is markedly improved. However, the floc density and the floc morphology are only slightly changed; therefore, the zone settling characteristics are those of the original sludge. With a low freezing speed, however, global particle migration occurs. Consequently, both the sludge filterability and settleability are enhanced. The floc density and the morphology are changed significantly. With an intermediate freezing speed, a gradual transition of sludge characteristics occurs between the two extremes, resulting from an average behavior of the constituting floes. No precise definition for the critical freezing speed can thereby be defined. If improvement of sludge filterability is the only concern, a high freezing speed is acceptable. Furthermore, a low freezing speed is necessary if both sludge settleability and bound-water content must be changed.
机译:在这项工作中,我们采用废物活化污泥的单向冻结来研究冻结速度对污泥性能的影响,包括过滤性,区域沉降以及絮凝物密度与尺寸的关系。冷冻速度高,不会发生整体颗粒迁移,但是污泥的可过滤性显着提高。但是,絮凝物密度和絮凝物形态仅稍有变化;因此,区域沉降特性是原始污泥的特性。但是,冻结速度低时,会发生整体颗粒迁移。因此,污泥的过滤性和沉降性均得到提高。絮状物密度和形态发生了显着变化。在中等的冷冻速度下,由于组成絮凝物的平均行为,在两个极端之间出现了污泥特性的逐渐转变。因此,不能为临界冷冻速度定义精确的定义。如果仅关注提高污泥过滤性,则可以接受高冷冻速度。此外,如果必须同时改变污泥的沉降性和结合水含量,则需要较低的冷冻速度。

著录项

  • 来源
    《Environmental Science & Technology》 |1996年第7期|p.2391-2396|共6页
  • 作者单位

    Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, 10617 Republic of China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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