1·The secondary pollutants in the process of degradation of organic chemicals;
有机污染物降解过程中的次生污染物问题；
2·Air pollutants are separated into two categories: primary pollutants and secondary pollutants.
污染物可分为两类别：主要染物及次级污染物。
3·And these secondary pollutants of mineral reagents can enlarge the scale of pollution, and increase the complexity of pollution.
且这些二次污染物有的进一步交叉、作用，使矿山药剂的二次污染链延伸。
4·Sludge is the secondary pollutants that come from wastewater treatment. It has become solid waste pollution problem needed to be solved urgently.
污泥是废水处理之后引入的二次污染，它已经成为目前环境方面急需解决的固废污染问题。
5·The effect of operation conditions of flat-sheet MBR on self-formed secondary membrane and the removal efficiency of pollutants by self-formed secondary membrane were studied.
研究了平板膜m BR中不同工况对自生二次膜的影响和自生二次膜对污染物的去除效果。
6·Through the secondary treatment, most organic pollutants in raw wastewater transfer into excess sludge, and the sludge discharge quantity (as BOD) will be much higher than that in the effluent.
污水处理厂大量外排污泥势必对受纳环境产生不利影响 ，其程度取决于污泥的无害化或资源化处理和处置方式。