• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Wettability studies of filter media using capillary rise test
【24h】

Wettability studies of filter media using capillary rise test

机译：使用毛细上升试验研究滤料的润湿性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Filtration process is a typical tertiary treatment method for oily wastewater, suitable for the lower oil concentration and oil-in-water emulsion system. Therein the wettability of oil-in-water emulsions to filter media probably has some significant influences on the oil removal efficiency, namely a lipophilic filter medium have a better performance in oil droplets coalescence and attachment than a hydrophilic one. In this paper, a Lipophilic to Hydrophilic Ratio (LHR) concept was defined on the basis of Washburn's equation and a test equipment was correspondingly designed, which were used to compare quantificationally the wettable selectivities of three filter media to oil and water. The selected filters were anthracite, manganese ore and quartz sand particles with a size fraction of +0.9 to 1.2 mm and the wetting liquids were apolar cyclohexane and polar deionized water. At the same time, the effect of filter particle size on the LHR value was also explored. Linear least-square fits for all wetting rates gave regression coefficients of more than 0.9991, confirming the suitability of the experimental method for filter particles and further validating Washburn's theory. The determined LHR values of anthracite, manganese ore and quartz sand are 1.93, 0.75 and 0.69, respectively, which means anthracite is lipophilic while manganese ore and quartz sand are hydrophilic. Moreover, for three selected particle size fractions the LHR values of anthracite particles are always the greatest and that of manganese ore are a little bit greater than quartz sand particles. Therefore, it can be deduced that the wettable differences probably be attributed to the differences of surface chemistries of filter samples. Namely, anthracite surface contains principally organic functional groups composed of carbon and oxygen elements and therefore presents apolar and lipophilic characterization, while manganese ore and quartz sand surfaces have SiO2 species and make them polar and hydrophilic. This conclusion is approximatively confirmed by the analysis results of X-ray photoelectron spectroscopy (XPS).
机译：过滤工艺是含油废水的典型三次处理方法，适用于较低的油浓度和水包油乳液体系。其中水包油乳液对过滤介质的润湿性可能对除油效率有一些重要影响，即亲脂性过滤介质在油滴聚结和附着方面的性能要比亲水性更好。本文基于Washburn方程定义了亲油亲水性（LHR）概念，并相应设计了一种测试设备，用于定量比较三种过滤介质对油和水的可润湿选择性。选择的过滤器为无烟煤，锰矿石和石英砂颗粒，其粒径分数为+0.9至1.2 mm，润湿液为非极性环己烷和极性去离子水。同时，还研究了过滤器粒径对LHR值的影响。所有润湿率的线性最小二乘拟合得出的回归系数均大于0.9991，这证实了该实验方法适用于过滤颗粒的适用性，并进一步验证了Washburn的理论。确定的无烟煤，锰矿和石英砂的LHR值分别为1.93、0.75和0.69，这意味着无烟煤具有亲脂性，而锰矿和石英砂则具有亲水性。此外，对于三个选定的粒度分数，无烟煤颗粒的LHR值始终最大，而锰矿石的LHR值则比石英砂颗粒大。因此，可以推断出可润湿性差异可能归因于过滤器样品表面化学性质的差异。即，无烟煤表面主要包含由碳和氧元素组成的有机官能团，因此表现出非极性和亲脂性，而锰矿石和石英砂表面具有SiO 2种类并且使其具有极性和亲水性。 X射线光电子能谱（XPS）的分析结果大致证实了这一结论。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号