• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Mechanisms of arsenate removal and membrane fouling in ferric based coprecipitation-low pressure membrane filtration systems
【24h】

Mechanisms of arsenate removal and membrane fouling in ferric based coprecipitation-low pressure membrane filtration systems

机译：基于铁的共沉淀 - 低压膜过滤系统中砷酸盐去除和膜污垢的机制

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

Ferric based coprecipitation-low pressure membrane filtration is a promising arsenic (As) removal method, however, membrane fouling mechanisms are not fully understood. In this study we investigated the effect of feed water composition and membrane pore size on arsenate [As(V)] removal and membrane fouling. We observed that As removal efficiency was independent of the membrane pore size because the size of the Fe(III) particles was larger than the pore size of the membranes, attributed to a high calcium concentration in the feed water. Arsenic coprecipitation with Fe(III) (oxyhydr)oxides rapidly reached equilibrium before membrane filtration, within 1 min. Therefore, As removal efficiency was not improved by increasing residence time before membrane filtration. The removal of As(V) was strongly dependent on feed water composition. A higher Fe(III) dose was required to reduce As(V) to sub-mu g/L levels for feed water containing higher concentration of oxyanions such as phosphate and silicate, and lower concentration of cations such as calcium. Cake-layer formation was observed to be the predominant membrane fouling mechanism.
机译：基于铁的共沉淀 - 低压膜过滤是一种有前途的砷（AS）去除方法，然而，膜污垢机制不完全理解。在这项研究中，我们研究了饲料水组合物和膜孔径对砷酸的影响[AS（V）]去除和膜污垢。我们观察到，由于Fe（III）颗粒的尺寸大于膜的孔径，所以去除效率与膜孔径无关，所以归因于进料水中的高钙浓度。在1分钟内，用Fe（III）（氧水）（OxyHydr）（OxyHydr）（Oxyhydr）氧化物在膜过滤之前快速达到平衡。因此，由于在膜过滤前增加停留时间，不会改善去除效率。除去（V）的去除依赖于饲料水组合物。需要更高的Fe（III）剂量以将含有较高浓度氧基浓度的氧化水（例如磷酸盐和硅酸盐）的亚mu g / L水平降低至亚mu g / l水平，以及较低浓度的阳离子如钙。观察到蛋糕层形成是主要的膜污垢机制。

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