We found one dictionary that defines the word active sludge:

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1. active sludge: Encyclopedia

▸ Words similar to active sludge ▸ Usage examples for active sludge ▸ Idioms related to active sludge ▸ Wikipedia articles (New!) ▸ Words that often appear near active sludge ▸ Rhymes of active sludge ▸ Invented words related to active sludge