sludge collecting tank

例句：

1. 1. The sludge collecting tank is used to treat the wastewater from the factory.
   污泥收集罐用于处理工厂的废水。
2. 2. The engineer designed a new sludge collecting tank to improve the efficiency of the wastewater treatment process.
   工程师设计了一个新的污泥收集罐，以提高废水处理过程的效率。
3. 3. The sludge collecting tank was filled with thick black sludge, which had accumulated over time.
   污泥收集罐里装满了厚厚的黑色污泥，这是随着时间的推移积累起来的。