6 sentences

1. 工厂向河流中排出废水。

   gōng​chǎng xiàng hé​liú zhōng pái​chū fèi​shuǐ.

   The factory discharges wastewater into the river.

   Source: Dong Chinese Dictionary

2. 工业废水中含有大量的污染物。

   gōng​yè fèi​shuǐ zhōng hán​yǒu dà​liàng de wū​rǎn​wù.

   Industrial wastewater contains a large amount of pollutants.

   Source: Dong Chinese Dictionary

3. 工业废水排入水体会造成严重污染。

   gōng​yè fèi​shuǐ pái​rù shuǐ​tǐ huì zào​chéng yán​zhòng wū​rǎn.

   Discharging industrial wastewater into water bodies causes serious pollution.

   Source: Dong Chinese Dictionary

4. 工厂必须在排放废水前进行净化处理。

   gōng​chǎng bì​xū zài pái​fàng fèi​shuǐ qián jìn​xíng jìng​huà chǔ​lǐ.

   Factories must treat wastewater before it is discharged.

   Source: Dong Chinese Dictionary

5. 工业废水是造成水污染的主要原因之一。

   gōng​yè fèi​shuǐ shì zào​chéng shuǐ​wū​rǎn de zhǔ​yào yuán​yīn zhī​yī.

   Industrial wastewater is one of the main causes of water pollution.

   Source: Dong Chinese Dictionary

6. 这种工厂排出的废水中含有大量重金属。

   zhè zhǒng gōng​chǎng pái​chū de fèi​shuǐ zhōng hán​yǒu dà​liàng zhòng​jīn​shǔ.

   The wastewater discharged from this factory contains a large amount of heavy metals.

   Source: Dong Chinese Dictionary