waste-water from coal mine

例句：

1. 1.The factory discharged a lot of wastewater into the river.
   工厂向河流排放了大量废水。
2. 2.The city has been working on reducing its wastewater emissions.
   该市一直在努力减少其废水排放量。
3. 3. The treatment plant is designed to remove wastewater before it reaches the ocean.
   处理厂的设计是为了在废水到达海洋之前去除它。