考虑砷（As）吸附介质的公用事业公司面临的一个主要问题是中试 测试需要很长的时间，因此成本很高。例如，200毫升的实验室规模 柱（直径5厘米，长10厘米）在5分钟的空床接触下运行10000 BVs 时间（EBCT）需要35天的运行时间，并将使用500升水。加速测试 该协议正在开发中，以快速确定新介质的吸附特性 使用与颗粒活性炭（GAC）吸附类似的程序 这被称为快速小规模柱测试（RSSCT）。吸附涉及 包括传质过程和吸附动力学在内的一系列步骤。 对于广汽来说 颗粒内表面扩散速率通常控制着吸附的总体速率，因此 使用比全尺寸吸附器更小的颗粒进行的实验可以加速反应 测试过程。相似性用于建立实验室之间的比例关系 色谱柱和全尺寸GAC吸附系统。两者之间有着重要的区别 有机物在活性炭上的吸附和砷在金属氧氢氧化物表面的吸附。 其中包括键的性质和膜的内部孔结构的差异 吸附剂。这些为GAC开发的标度关系正在进行As吸附研究 在四种金属氧化物介质上； 活性氧化铝、两种氢氧化铁介质和一种专利 金属氧化物介质。测试包括批量测定吸附平衡 研究，测量颗粒内表面扩散，以及使用 各种尺寸。最重要的区别是键的性质和物理性质 金属氧化物吸附剂的特性。与有机分子之间的疏水键形成对比 溶质和GAC砷在金属氧化物表面的吸附主要是静电作用 吸引力，至少最初是这样。此外，金属氧化物表面的内部孔隙率比金属氧化物表面小得多 GAC可以减少表面积和不同类型的传质。 包括16个参考文献、表格和图表。

A major problem faced by utilities considering arsenic (As) adsorption media is that pilot testing requires very long runs and therefore is very costly. For example, a 200 mL lab scale column (5 cm diameter by 10 cm long) operated for 10,000 BVs at a 5 minute empty bed contact time (EBCT) requires a run length of 35 d and will use 500 L of water. An accelerated testing protocol is being developed to rapidly determine the adsorption characteristics of new media using procedures similar to those developed for granular activated carbon (GAC) adsorption which are referred to as rapid small scale column testing (RSSCT). Adsorption involves a sequence of steps including mass transfer processes and adsorption kinetics. For GAC, the intraparticle surface diffusion rate often controls the overall rate of adsorption, hence experiments conducted with smaller particles than used in a full scale adsorber can accelerate the testing process. Similitude was used to develop scaling relationships between laboratory columns and full scale GAC adsorption systems. There are important differences between adsorption of organics onto GAC and adsorption of As onto metal oxy-hydroxide surfaces. These include differences in the nature of the bonds and the internal pore structure of the adsorbents. These scaling relationships developed for GAC are being examined for As adsorption onto four metal oxide media; activated alumina, two iron oxy-hydroxide media, and a proprietary metal oxide media. The testing involves determination of the adsorption equilibria in batch studies, measurement of the intraparticle surface diffusion, and column studies using media of various sizes. The most important differences are the nature of the bonds and the physical characteristics of metal oxide adsorbents. In contrast to the hydrophobic bonds between organic solutes and GAC arsenic adsorption onto metal oxide surfaces is dominated by electrostatic attraction, at least initially. Also, metal oxide surfaces have much less internal porosity than GAC which results in less surface area and different types of mass transfer. Includes 16 references, tables, figures.