叙述了水体中含氮类污染物的来源、种类、相互转化方式和条件、表征意义等，以便对水中氮类污染物有一个全面、 系统的认识。
The sources, kinds and the exchanging conditions of the nitrogen pollutants in water are related. This make the recognization of the nitrogen pollutant systematic and comprehensive.
通过介绍特征污染物含碳有机物（BOD_5）、悬浮物、总氮、磷、重金属以及细菌的去除，阐述了污染物去除的基本特征和作用机理。
The characteristics and function mechanism were illustrated through the elimination of pollutants such as BOD5 , SS, NH3-N, P, heavy metals and microbes.
应用推荐