Gōngyè / fèishuǐ / zhōng / de / zhòngjīnshǔ / kěnéng / zài / chénjīwù / lǐ / nóngjí / yīncǐ / xūyào / dìngqī / jiǎncè工业废水中的重金属可能在沉积物里浓集,因此需要定期检测。Heavy metals in industrial wastewater may concentrate in sediment, so regular testing is necessary.