这项工作的目的是量化pH值和竞争离子在溶液中的影响 铁混凝除砷过程中其他竞争离子的存在与否 氯化物。另一个目的是比较原位生成的氢氧化铁和粒状氧化铁 氧化物介质作为砷吸附剂，以µg as吸附/g Fe（III）为基础。最后，尝试失败了 使用MINEQL+化学平衡建模程序预测砷的吸附 pH和竞争离子的函数。As（V）的去除高度依赖于pH，而As（III）的去除高度依赖于pH 基本上与NSFI中的pH值无关- 53挑战水。As（V）的吸附 在pH值为6.5-8.5的范围内充电的砷显著高于不充电的砷（III）。原位 与颗粒介质相比，形成的氢氧化物具有显著更高的吸附容量 由于FeOOH混凝剂的有效表面积高。三种相互竞争的离子——硅酸盐， 磷酸盐和钒酸盐——干扰砷的吸附，干扰程度取决于 竞争离子浓度和其他竞争离子的存在与否。这个 未经修改的Mineql+化学平衡建模程序无法模拟As（III）或As（V） FeCl₃混凝过程中Fe（OH）_{3的吸附。包括数字。}

The objectives of this work were to quantify the effects of pH and competing ions in the presence and absence of other competing ions on arsenic removal during coagulation with ferric chloride. An additional objective was to compare in-situ formed ferric hydroxides vs. granular ferric oxide media as arsenic adsorbents on the basis of µg As sorbed/g Fe(III). Finally, attempts were made to use the MINEQL+ chemical equilibrium modeling program to predict arsenic adsorption as a function of pH and competing ions. The removal of As(V) was highly pH dependent while As(III) was largely independent of pH in the NSFI-53 challenge water. The adsorption of As(V) which is charged in the pH range of 6.5-8.5 was significantly higher than uncharged As(III). The in-situ formed hydroxides had significantly higher adsorption capacities compared to the granular media due to high effective surface area of FeOOH coagulant. All three competing ions--silicate, phosphate, and vanadate--interfered with arsenic adsorption, and the level of interference depended on the competing ion concentration and the presence or absence of other competing ions. The unmodified Mineql+ chemical equilibrium modeling program could not simulate As(III) or As(V) adsorption onto Fe(OH)₃ during FeCl₃ coagulation. Includes figures.