本文介绍的研究是美国环保局合作协议的一部分，该协议旨在评估三种类型的进入点（POE）设备的性能:颗粒活性炭（GAC）、扩散气泡曝气和处理含氡地下水供应的气泡板曝气系统。在本研究中，可以对各个POE系统进行直接比较，因为它们在平行流配置中运行，并且每个系统都从废弃的小型社区地下水供应中接收相同的进水原水。每日负荷模式旨在模拟家庭POE系统的需求。 根据三个主要因素对每个POE系统进行了评估:氡去除效率、潜在的运行和维护问题（即废物处理、辐射暴露、设备故障、中间污染）和经济性。这项研究的目的不是为这些系统制定设计标准，而是评估它们在一年的持续运行中的性能。

The research presented in this paper was part of an USEPA Cooperative Agreement to evaluate the performance of three types of Point-Of-Entry (POE) devices: granular activated carbon (GAC), diffused bubble aeration, and bubble plate aeration systems treating a groundwater supply containing radon. In this study, a direct comparison could be made among the individual POE systems since they were operated in a parallel flow configuration and each received the same influent raw water from an abandoned small community groundwater supply. The daily loading pattern was designed to simulate demand for a household POE system. Each of the POE systems was evaluated with respect to three primary factors: radon removal efficiency, potential operation and maintenance problems (i.e., waste disposal, radiation exposure, equipment malfunctions, intermedia pollution) and economics. The study was not intended to develop design criteria for these systems, but rather to evaluate their performance over one year of constant operation.