为了准备更严格的消毒副产品监管，该区开始了一项全面的中试规模臭氧氧化研究。这项研究的目的是评估臭氧氧化对溴酸盐形成的影响，以及减少引起味道和气味的化合物。还测试了可变臭氧剂量、溴化物浓度、臭氧接触器配置和臭氧原料气浓度对溴酸盐生成以及geosmin和MIB还原的影响。臭氧以满足C x T消毒标准所需的最低剂量使用，并以控制味道和气味所需的更高剂量使用。臭氧以两种不同的接触器配置添加到水中，即40/20/20/20和60/20/20/20%的分流。在原水中加入geosmin和MIB，以及不同浓度的溴化物。 测定了臭氧残留量、未经处理和处理的TOC、UV254、碱度、硬度、浊度、颜色、pH值、土工蛋白、MIB、溴化物和溴酸盐。研究结果表明，即使在pH值相当的情况下，沉淀水臭氧氧化产生的溴酸盐水平也低于原水臭氧氧化。沉淀水臭氧氧化的溴酸盐水平始终低于10 ug/L水平，臭氧剂量为1.0 log时，贾第鞭毛虫失活所需的溴酸盐水平。在这两个应用点，添加氨水和降低pH值的方法都可以减少溴酸盐的生成。原水臭氧氧化比沉淀水臭氧氧化更有效地还原土工蛋白和MIB。臭氧原料气浓度越高，成品水溴酸盐含量越高。臭氧剂量分裂的初步结果没有定论。将收集更多数据，以获得更多关于臭氧接触器配置对溴酸盐形成影响的信息。

In preparation for a more stringent disinfection byproduct regulation, the District embarked on a comprehensive pilot scale ozonation study. The goal of the study was to evaluate the impact of ozonation on formation of bromate and reduction of taste and odor causing compounds. The effect of variable ozone dose, bromide concentration, ozone contactor configuration, and ozone feed gas concentration on the formation of bromate and reduction of geosmin and MIB were also tested. Ozone was applied at the minimum dose required to meet the C x T criteria for disinfection, and at higher doses required for taste and odor control. Ozone was added to the water at two different contactor configurations, at 40/20/20/20 and at 60/20/20/20 percent splits. The raw water was spiked with geosmin and MIB, and varying concentrations of bromide. Ozone residual, raw settled and finished TOC, UV254, alkalinity, hardness, turbidity, color, pH, geosmin, MIB, bromide and bromate were measured. The results of the study show that settled water ozonation produces lower bromate levels than raw water ozonation, even at comparable pH. Bromate levels for the settled water ozonation were consistently below the 10 ug/L level, at ozone doses required for 1.0 log inactivation of Giardia. Ammonia addition and pH reduction methods reduced bromate formation for both application points. Raw water ozonation was more effective in the reduction of geosmin and MIB than settled water ozonation. Higher ozone feed gas concentration resulted in higher finished water bromate levels. The preliminary results for ozone dose splitting were inconclusive. Additional data will be gathered to obtain more information on the impact of ozone contactor configuration on bromate formation.