城市污水处理场的底泥含有大量的微生物，其中包括一些病原菌，如果不加处理会给环境造成再次污染。

The sludge from city sewage plant contains enormous microorganism, some of them are pathogenic bacteria, which will cause secondary pollution if notsuitably treated.

youdao

城市污水处理场的底泥含有大量的微生物，其中包括一些病原菌，如果不加处理会给环境造成再次污染。

The sludge from city sewage plant contains enormous microorganism, some of them are pathogenic bacteria, which will cause secondary pollution if notsuitably treated.

youdao