使用离子交换从饮用水中去除砷酸盐的主要缺点是，其他离子，尤其是硫酸盐，成功地与砷酸盐竞争交换位置。我们研究了一种新的工艺操作方法，在该工艺中，富砷区半永久性地保留在操作柱中，从而仅再生富含硫酸盐的树脂。这样，在处理超过36000床体积的进水时，基本上所有进入系统的砷都被保留下来。此外，还研究了从盐水中沉淀CaSO4或BaSO4以及盐水溶液的后续再利用。总的来说，改良柱操作和盐水回收相结合可以显著降低离子交换砷处理的相关成本。包括数字。

The major drawback to the use of ion exchange for removal of arsenate from potable water is that other ions, especially sulfate, successfully compete with the arsenate for exchange sites. We investigated a novel approach for operating such a process in which an arsenic-rich zone is semi-permanently retained in the operating columns, so that only sulfate-rich resin is regenerated. In this way, essentially all the arsenic fed to the system was retained during treatment of >36,000 bed volumes of influent. The precipitation of CaSO4 or BaSO4 from the brine and the subsequent reuse of the brine solution was also studied. Overall, the combination of modified column operation and brine recovery can dramatically reduce the costs associated with arsenic treatment by ion exchange. Includes figures.