北卡罗来纳州的达尔县位于美国大西洋中海岸。这是一个主要由水组成的县，其陆地区域主要由障壁岛组成。哈特拉斯岛是陆地最南端的地区。哈特拉斯岛是联邦政府拥有的大片土地的家园，因此增长仅限于罗丹斯波萨尔沃、埃文和岛南端的三个村庄。大约从1968年开始，哈特拉斯岛南端的阿沃纳特居民就可以使用饮用水系统。该系统最初由用户所有的合作公用事业公司Cape Hatteras WaterAssociation（CHWA）拥有和运营。水源是位于巴克斯顿森林地区的一个浅（40'-8O'）井场。目前的水处理系统从2000年2月开始运行，取代了之前的1。 从1986年开始的每天600万加仑的系统。CHWA在20世纪90年代初试图扩大井场以满足未来的需求，并进行了几项研究和试点试验，以使水质符合当时的饮用水标准。然而，由于井场位于敏感的海洋森林中，且国家确定井场为“受影响的地下水”，因此井场扩建受到了环境方面的挑战这两个因素严重限制了CHWA处理厂达到或超过饮用水质量主要标准的能力，以及为服务区的持续增长提供所需水量的能力。1992年的一项研究概述了现有的治疗方案，这些方案将使CHWA有合理的机会遵守当时的现行标准，以及未来即将到来的已知和推测性标准。 该报告涵盖了当前处理流程的不足之处，以及未来合规的流程选择。它没有解决原水资源问题。此外，除了治疗缺陷，输电和配电系统完全不足以为现有客户服务。本文描述了哈特拉斯岛反渗透微咸水淡化厂的设计和运行。包括表格、数字。

Dare County, North Carolina, is located on the Mid-Atlantic seaboard of theUnited States. It is a county that consists primarily of water, and its land areais largely composed of barrier islands. Hatteras Island is the most southerly ofthe land area. Hatteras Island is home to large tracts of federally owned land,so the growth has been limited to the three villages of Rodanthe-Waves-Salvo,Avon, and the southern end of the island. Since about 1968, the residents of Avonat the southern end of Hatteras Island have had access to a potable water system.This system was originally owned and operated by the Cape Hatteras WaterAssociation (CHWA), a user-owned cooperative utility. The source of water hasbeen a shallow (40'-8O') well field located in an area known as Buxton Woods. Thecurrent water treatment system has been in operation since February of 2000,replacing the former 1.6 million gallons per day system which dated from 1986.The CHWA tried in the early 1990s to expand the well field to meet future demand,and conducted several studies and pilot tests in order to bring the water qualityinto compliance with the then current drinking water standards. However, the wellfield expansion was challenged on environmental grounds, since the well field islocated in a sensitive maritime forest, and also the State determined that thewell field was "groundwater under the influence." These two factors severelylimited the ability of the CHWA treatment plant to meet or exceed the primarystandards for drinking water quality, and to supply the quantity of water neededfor the continued growth in the service area. A 1992 study provided an overviewof the treatment options available that would permit CHWA a reasonableopportunity of compliance with then current standards, and those upcoming in thefuture, both known and speculative. The report covered both inadequacies of thecurrent treatment process, and process options for future compliance. It did nothowever address the question of raw water resources. And, in addition totreatment shortcomings, the transmission and distribution system was barelyadequate to serve existing customers. This paper describes the design andoperation of a reverse osmosis brackish groundwater desalination plant forHatteras Island. Includes tables, figures.