欧文牧场水区（IRWD）在加利福尼亚州圣安娜进行了一项试点研究，以开发当地地下水资源。砷去除与天然有机物去除同时进行评估。这项初步研究评估了传统的处理工艺和膜技术（微滤、纳滤和反渗透）。文中给出了试点设施的流程图。本研究的目的是:评估去除砷所需的混凝剂剂量，以满足未来不同水平的MCL；评价强化混凝与微滤相结合去除砷的效果；并评估不同类型膜去除砷的效果。

The Irvine Ranch Water District (IRWD) conducted a pilot study in Santa Ana, California, to develop local groundwater resources. Arsenic removal was evaluated simultaneously with natural organic material removal. The pilot study evaluated conventional treatment processes and membrane technology (microfiltration, nanofiltration, and reverse osmosis). A flow diagram of the pilot facilities is shown in the paper. The objectives of this research were: Evaluate coagulant dosages required to remove arsenic to meet different levels of future MCLs; Evaluate the effectiveness of combining enhanced coagulation with microfiltration to remove arsenic; and Evaluate the effectiveness of different types of membranes in removing arsenic.