砷“剖面”是从全面的常规处理（混凝、铁锰氧化或软化）工厂获得的，有助于测试有关砷去除的理论。可溶性砷（V）的去除效率主要由混凝过程中的pH值、铁锰氧化过程中的Fe+2氧化和Fe（OH）3沉淀以及软化过程中的Mg（OH）2生成控制。软化厂的方解石沉淀或铁锰氧化厂的Mn+2氧化沉淀过程中，可溶砷（V）的去除不显著。在凝固和软化处理期间，可溶性As（V）的去除程度低于预期。有些令人惊讶的是，在混凝过程中，As（V）的去除效率受到颗粒铝形成和去除的限制，因为添加的大部分混凝剂没有被0.45微米孔径的过滤器去除。在一个实用程序中，将凝固pH值从7降低。 4至6.8（在恒定明矾剂量下）改善了颗粒铝的去除，从而提高了处理期间可溶As（V）的去除。包括9个参考文献、表格、图表。

Arsenic "profiles" were obtained from full-scale conventional treatment (coagulation, Fe-Mn oxidation, or softening) plants, facilitating testing of theories regarding arsenic removal. Soluble As(V) removal efficiency was controlled primarily by pH during coagulation, by Fe+2 oxidation and Fe(OH)3 precipitation during Fe-Mn oxidation, and by Mg(OH)2 formation during softening. Insignificant soluble As(V) removal occurred during calcite precipitation at softening plants or during Mn+2 oxidation-precipitation at Fe-Mn oxidation plants. The extent of soluble As(V) removal during coagulation and softening treatments was lower than expected. Somewhat surprisingly, during coagulation As(V) removal efficiencies were limited by particulate aluminum formation and removal, because much of the added coagulant was not removed by 0.45-um-pore-size filters. At one utility, reducing the coagulation pH from 7.4 to 6.8 (at constant alum dose) improved removal of particulate aluminum, thereby enhancing soluble As(V) removal during treatment. Includes 9 references, tables, figures.