为了减少有机卤化物的形成，人们正在认真考虑臭氧等替代预氧化剂。臭氧去除三卤甲烷（THM）前体，同时改善浊度去除的能力，引起了人们对预臭氧-明矾混凝处理方案的兴趣。明矾凝固在很大程度上去除了所有测试前体（THM、总有机卤化物（TOX）、三氯乙酸（TCAA）、二氯乙酸（DCAA）、二氯乙腈（DCAN）和1,1,1-三氯丙酮）。 pH值为7、典型水处理剂量和碳酸氢盐水平的臭氧氧化去除了THM、TOX、TCAA和DCAN前体。在0.3和1.2 mg O3/mg C、天然碳酸氢盐水平和pH值为7的条件下，臭氧氧化阻碍了有机前体的明矾凝聚以及TOC和紫外线吸收物质的凝聚。水生黄腐酸溶液和中等颜色的未经处理的饮用水都可以看到预分区导致的整体去除率降低。包括33个参考文献、表格和图表。

Alternative preoxidants such as ozone are being given serious consideration for reducing organic halide formation. The ability of ozone to remove trihalomethane (THM) precursors while improving turbidity removal has generated interest in the preozonation - alum coagulation treatment scheme. Alum coagulation removed all precursors tested (THM, total organic halides (TOX), trichloroacetic acid (TCAA), dichloroacetic acid (DCAA), dichloroacetonitrile (DCAN), and 1,1,1-trichloroacetone) to a significant extent. Ozonation at pH 7 with typical water treatment dosages and bicarbonate levels removed THM, TOX, TCAA, and DCAN precursors. Ozonation at 0.3 and 1.2 mg O3/mg C, at natural bicarbonate levels and pH 7, hindered the alum coagulation of organic precursors and the coagulation of TOC and UV-absorbing substances. Diminished overall removal as a result of preozonation was seen both with an aquatic fulvic acid solution and a moderately colored raw drinking water. Includes 33 references, table, figures.