为避免城市污水污泥产生二次污染，必须对其进行妥善处理与处置。

The treatment and disposal of sludge is essential in the process of wastewater treatment.

youdao

为避免城市污水污泥产生二次污染，必须对其进行妥善处理与处置。

The treatment and disposal of sludge is essential in the process of wastewater treatment.

youdao