单词：active sludge
active sludge的用法和样例：
例句
- Acetate was degraded by denitrifying activated sludge.本文报道脱氮活性污泥降解乙酸根的过程。
- Thirdly, some kinds of microfauna should be added into sludge.向活性污泥曝气池中投放微型动物。
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