加拿大安大略省基奇纳市曼海姆水处理厂使用了一个配有6 X 1 kW中压紫外线（UV）灯的中试规模（111 L）流动反应器，以研究中压紫外线照射对饮用水处理过程中消毒副产物压力的去除或形成的影响。紫外线中试反应器是在臭氧氧化和生物过滤之后，但在用氯进行最终消毒之前安装的。在各种水质和操作条件下采集样本，并进行均匀地层条件（UFC）测试，以估算最终总三卤甲烷（TTHM）和卤乙酸（HAA9）浓度。实验表明，仅中压紫外线对THM和HAA9前体没有可测量的影响，并且在氯化24小时后不会改变氯需求量。 然而，在添加过氧化氢和紫外线照射的条件下，TTHM和HAA9浓度随紫外线剂量近似线性增加，最高可达2000 mJ/cm2。当剂量为100 mJ/cm2时，预计将是饮用水处理期间应用的最大紫外线剂量，H2O2剂量范围为3.6 mg/L至51 mg/L，与无紫外线应用相比，TTHM浓度增加2%至7%，HAA9浓度增加2%至6%。

A pilot scale (111 L) flow-through reactor equipped with 6 X 1 kW medium-pressure ultraviolet (UV) lamps was utilized at the Mannheim Water Treatment Plant in Kitchener, Ontario, Canada to investigate the impact of medium-pressure UV irradiation on the removal or formation of disinfection byproduct presursors during drinking water treatment. The UV pilot reactor was installed after ozonation and biological filtration but before final disinfection with chlorine. Samples were taken under various water quality and operational conditions and subjected to Uniform Formation Condition (UFC) testing to estimate final total trihalomethane (TTHM) and haloacetic acid (HAA9) concentrations. The experiments demonstrated that medium-pressure UV alone did not have a measurable effect on the THM and HAA9 precursors and did not change the chlorine demand after 24 h chlorination. However, under the condition of added hydrogen peroxide plus ultraviolet irradiation, the TTHM and HAA9 concentrations increased approximately linearly with UV dose up to a maximum of 2000 mJ/cm2. At a dose of 100 mJ/cm2, expected to be the maximum UV dose applied during drinking water treatment and with H2O2 doses ranging from 3.6 mg/L to 51 mg/L, increases ranged from 2% to 7% for the TTHM concentrations and from 2% to 6% for the HAA9 concentrations compared to no UV application.