...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Membrane Science >Removal of organic contaminants by RO and NF membranes
【24h】

Removal of organic contaminants by RO and NF membranes

机译：通过RO和NF膜去除有机污染物

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

Rejection characteristics of organic and inorganic compounds were examined for six reverse osmosis (RO) membranes and two nanofiltration (NF) membranes that are commercially available. A batch stirred-cell was employed to determine the membrane flux and the solute rejection for solutions at various concentrations and different pH conditions. The results show that for ionic solutes the degree of separation is in fluenced mainly by electrostatic exclusion, while for organic solutes the removal depends mainly upon the solute radius and molecular structure. In order to provide a better understanding of rejection mechanisms for the RO and NF membranes, the ratio of solute radius (r_(i,s)) to effective membrane pore radius (r_p) was employed to compare rejections. An empirical relation for the dependence of the rejection of organic compounds on the ratio r_(i,s)/r_p is presented. The rejection for organic compounds is over 75% when r_(i,s)/r_p is greater than 0.8. In addition, the rejection of organic compounds is examined using the extended Nernst-Planck equation coupled with a steric hindrance model. The transport of organic solutes is controlled mainly by diffusion for the compounds that have a high r_(i,s)/r_p ratio, while convection is dominant for compounds that have a small r_(i,s)/r_p ratio.
机译：检查了六种反渗透（RO）膜和两种市售的纳滤（NF）膜的有机和无机化合物的排斥特性。使用批量搅拌池来确定膜在不同浓度和不同pH条件下的通量和溶质截留率。结果表明，对于离子型溶质，分离程度主要受静电排斥的影响，而对于有机溶质，去除程度主要取决于溶质半径和分子结构。为了更好地理解RO和NF膜的排斥机理，采用溶质半径（r_（i，s））与有效膜孔半径（r_p）的比率来比较排斥率。给出了有机化合物的排斥率与r_（i，s）/ r_p之比的依赖关系的经验关系。当r_（i，s）/ r_p大于0.8时，有机化合物的截留率超过75％。此外，使用扩展的Nernst-Planck方程与空间位阻模型耦合，检查了有机化合物的排斥。 r_（i，s）/ r_p高的化合物的扩散主要控制有机溶质的输送，而r_（i，s）/ r_p低的化合物的对流则占主导地位。

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