臭氧用于给水处理的几个理论和技术问题

根据作者在国外的实践经验和掌握的资料，综合论述了在给水的深度处理中应用臭氧技术的几个主要问题．以常规处理即混凝—沉淀—过滤流程为骨架导入臭氧和生物活性炭处理是国外用的比较多的深度处理流程，臭氧处理的目的主要在于去除水中三卤甲烷前驱物质，去除水的异臭味或水的消毒．臭氧能否有效地去除三卤甲烷前驱物质取决于这些物质的化学性态和臭氧处理条件；对水中异臭味物质分解起作用的主要是臭氧自我分解产物的氢氧自由基；臭氧对水中微生物的灭活效果可用其浓度和接触时间和乘积作为判断的指标．文中对这些处理过程的基本理论和技术要点进行了说明．

Theoretical and technical aspects of ozonation in drinking water treatment

Based on the author's own experience and collected information from abroad, this paper discussed some theoretical and technical problems related to the application of ozonation in advanced water treatment process. The typical process to achieve advanced treatment is to add ozonation and biological activated carbon adsorption to a conventional treatment train which is often a sequence of several treatment units such as coagulation, sedimentation and filtration. The main objectives of ozonation are trihalomethane(THM) precursor control, offensive odor and taste removal and/or disinfection. It was pointed out that the direct effect of ozonation in THM precursor removal depends on both the chemical properties of the precursor and ozone concentration. OH radicals resulted from the decomposition of aqueous ozone play important role in removing offensive odor and tastes. The effect of inactivation of microorganisms is governed by the product of ozone concentration and contact time.