cyclic activated sludge system

例句：

1. 1. The cyclic activated sludge system is an effective way to treatwastewater.
   循环活性污泥系统是一种有效的废水处理方法。
2. 2. The cyclic activated sludgesystem has been widely used in water treatmentplants.
   循环活性污泥系统在水处理厂得到了广泛应用。
3. 3. The cyclic activated sludgesystem can effectively remove pollutants fromwastewater.
   循环活性污泥系统能够有效地从废水中去除污染物。