secondary treatment

• 二次处理,二级处理

secondary treatment的用法和样例：

例句

1. Sludge liquor is recirculated in the secondary system.
   污泥水回流到二级处理系统。
2. The ozonation characteristics and kinetics of secondary effluent from WWTP were studied.
   研究了城市污水厂二级处理出水的臭氧氧化特性及其动力学规律。