Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA.
Water Res. 2010 Apr;44(8):2419-30. doi: 10.1016/j.watres.2010.01.004. Epub 2010 Jan 14.
Dissolved organic matter (DOM) and hardness cations are two common constituents of natural waters that substantially impact water treatment processes. Anion exchange treatment, and in particular magnetic ion exchange (MIEX), has been shown to effectively remove DOM from natural waters. An important advantage of the MIEX process is that it is used as a slurry in a completely mixed flow reactor at the beginning of the treatment train. Hardness ions can be removed with cation exchange resins, although typically using a fixed bed reactor at the end of a treatment train. In this research, the feasibility of combining anion and cation exchange treatment in a single completely mixed reactor for treatment of raw water was investigated. The sequence of anion and cation exchange treatment, the number of regeneration cycles, and the chemistry of the regeneration solution were systematically explored. Simultaneous removal of DOM (70% as dissolved organic carbon) and hardness (>55% as total hardness) was achieved by combined ion exchange treatment. Combined ion exchange is expected to be useful as a pre-treatment for membrane systems because both DOM and divalent cations are major foulants of membranes.
溶解有机物 (DOM) 和硬度阳离子是天然水中的两种常见成分，它们会极大地影响水处理过程。阴离子交换处理，特别是磁离子交换 (MIEX)，已被证明可以有效地从天然水中去除 DOM。MIEX 工艺的一个重要优点是，它在处理链的开始作为浆液在完全混合流反应器中使用。硬度离子可以用阳离子交换树脂去除，尽管通常在处理链的末端使用固定床反应器。在这项研究中，考察了在单个完全混合反应器中结合阴离子和阳离子交换处理来处理原水的可行性。系统地研究了阴离子和阳离子交换处理的顺序、再生循环的次数以及再生溶液的化学性质。通过组合离子交换处理可以同时去除 DOM（以溶解有机碳计为 70%）和硬度（以总硬度计为 55%以上）。组合离子交换有望作为膜系统的预处理，因为 DOM 和二价阳离子都是膜的主要污染物。
