因为原位形成的砷容量较高 氢氧化物和锆的日益普及 以及用于除砷的氢氧化钛介质， 铁与钛、锆的对比研究 使用混凝剂。亚砷酸盐[As（III）]和 使用锆和钛去除砷酸盐[As（V）] 将混凝剂与铁去除进行了比较 氯化物（三氯化铁）和明矾的标准挑战 水As（III）的吸附量明显低于对照组 As（V）在所有混凝剂的所有pH水平下的吸附。 质量和摩尔上的最高As（V）载荷 用FeCl观察碱基；sub>；3<;/分>；。As（V）移除 随着所有混凝剂pH值的降低而增加。这个 通常观察到少量砷（III）去除 明矾不去除任何砷（III）。 钛（III）的As（III）负载量最高，钛（III）似乎被氧化为As（V） 钛（III）水解产生的过氧化物。这个 所有混凝剂产生的污泥类型均通过 浸出过程及废弃物的毒性特征 提取试验。当比较化学成本时， FeCl；sub>；3<;/sub>；是As（III）最具成本效益的混凝剂 三种pH值下的As（V）和As（III）化学 凝血成本是其他药物的5到20倍 As（V）的那些。明矾是成本的四到八倍 FeCl的含量；sub>；3<;/sub>；用于As（V）移除。包括49个参考文献、表格、图表。

Because of the higher arsenic capacity of in situ-formed hydroxides and the growing popularity of zirconium and titanium oxyhydroxide media for arsenic removal, a comparative study of iron versus titanium and zirconium coagulants was conducted. Arsenite [As(III)] and arsenate [As(V)] removal using zirconium and titanium coagulants was compared with removal using ferric chloride (FeCl<;sub>;3<;/sub>;) and alum in a standard challenge water. As(III) adsorption was significantly lower than As(V) adsorption at all pH levels with all coagulants. The highest As(V) loadings both on mass and molar bases were observed with FeCl<;sub>;3<;/sub>;. As(V) removal increased with decreasing pH with all coagulants. The small amount of As(III) removal observed was generally independent of pH. Alum did not remove any As(III). The highest As(III) loadings were observed with titanium(III), which appeared to be oxidized to As(V) by peroxide resulting from titanium(III) hydrolysis. The types of sludge produced by all coagulants passed the toxicity characteristic leaching procedure and the waste extraction test. When chemical costs were compared, FeCl<;sub>;3<;/sub>; was the most cost-effective coagulant for As(III) and As(V) at all three pH values, and As(III) chemical coagulation costs were five to 20 times higher than those for As(V). Alum was four to eight times the cost of FeCl<;sub>;3<;/sub>; for As(V) removal. Includes 49 references, tables, figures.