本研究的目的是开发、优化和应用一种新的方法 使用反渗透（RO）浓缩并分离有机碳，然后 电渗析（ED）。电渗析是一种利用离子交换的膜分离过程- 交换膜，允许分离带电和中性成分。由于 电势和浓度梯度作为分离的驱动力， 有机分子可以从无机盐中分离出来，而不改变其特性 溶解有机碳（DOC）。与ED分离相关的问题与 带电低分子量有机物通过膜或 由于吸附到膜表面而造成的损失。一个单级实验室规模的反渗透装置，一个ED 使用膜测试装置和一个ED堆栈（Electrocynthesis，Inc.）进行测试 用分子量不同的单一有机化合物溶液进行实验， 地表水样本和处理过的废水样本。五种不同的离子- 选择性的 在膜测试装置中对膜对进行研究，以确定最适合的 用于实验室规模操作的ED膜。调查大量有机物的命运，以及 特定目标化合物、阳离子、阴离子、溶解有机碳（DOC）和紫外线 测量吸光度。在试验过程中，在线测量电导率、pH值和电流 每一次实验都是重复的。 从这项研究中得到的经验教训是，反渗透分离可以浓缩有机物 从NOM和EfOM样本可以实现大于90%的文档回收率。 对于NOM样品，进入RO渗透液的DOC损失在7%到8%之间变化 而对于EfOM样品，则分别为1%和2%。在胚胎发育过程中 选择过程，单价选择膜组合（朝日玻璃公司） 在所研究的所有膜中，DOC的截留率最高。拒绝 在ED处理期间，NOM和EfOM浓缩物的变化范围在96%到97%之间。信息技术 发现带电的低分子量化合物（分子量小于 200道尔顿）只能在ED期间被部分拒绝，因此应提交给DOC 丧失腐殖酸物质对ED膜的污染是可逆的 随后用0.1 N HCl溶液进行冲洗。总体文档拒绝率 在超过90%的情况下，RO/ED方法可以作为一种有价值的替代方法 从水中浓缩和分离有机物的传统XAD-8/-4树脂方法 样品。与XAD相比，这种方法可以回收更多不同的组分- 树脂 方法和避免样品污染和文件更改。这种方法更快 并且能够处理初始文档中较低的较高数量的样本（例如 地下水样本）。 包括19个参考文献、表格和图表。

The objective of this study was to develop, optimize, and apply a novel approach to concentrate and isolate organic carbon using reverse osmosis (RO) followed by electrodialysis (ED). Electrodialysis is a membrane separation process employing ion- exchange membranes which allows separating charged from neutral constituents. Due to an electric potential and a concentration gradient as the driving forces of separation, organic molecules can be isolated from inorganic salts without altering characteristics of dissolved organic carbon (DOC). Issues associated with ED separation are related to potential migration of charged low-molecular weight organics through the membrane or losses due to adsorption onto the membrane surface. A 1-stage lab-scale RO-unit, an ED membrane test unit, and an ED-stack (Electrosynthesis, Inc.) were employed to perform experiments with single organic compound solutions varying in molecular weight, surface water samples, and treated wastewater samples. Five different ion-selective membrane pairs were investigated in the membrane test unit to determine the best-suited ED membrane for laboratory-scale operation. To investigate the fate of bulk organics and specific target compounds, cations, anions, dissolved organic carbon (DOC) and UV absorbance were measured. Conductivity, pH, and current were measured online during each ED-experiment. Lessons learned from this study are that RO separation to concentrate organics from NOM and EfOM samples can achieve DOC recoveries larger than 90 percent. Losses of DOC into the RO permeate varied for NOM samples between 7 and 8 percent and for EfOM samples between 1 and 2 percent, respectively. During the ED-membrane selection process, a monovalent-selective membrane combination (Asahi Glass, Inc.) showed the best DOC rejection of all membranes investigated. The DOC rejection of NOM and EfOM concentrates during ED-treatment varied between 96 and 97 percent. It was found that charged low-molecular weight compounds (molecular weight less than 200 Dalton) can only be partly rejected during ED and therefore contributed to the DOC loss. Fouling of humic substances onto the ED membrane was reversible during a subsequent rinsing procedure with 0.1 N HCl-solution. With overall DOC rejection rates of more than 90 percent the RO/ED-approach can be a valuable alternative to the conventional XAD-8/-4 resin approach to concentrate and isolate organics from water samples. This approach recovers more and different fractions as compared to XAD-resin methods and avoids sample contamination and DOC alteration. The approach is faster and capable of processing higher volumes of samples low in initial DOC (such as groundwater samples). Includes 19 references, tables, figures.