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| activated sludge | |||
| active mud | |||
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| activated sludge Sludge that has been aerated and subjected to bacterial action; used to speed breakdown of organism matter in raw sewage during secondary waste treatment | |||
| biological sludge | |||
| activated sludge | |||
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| activated sludge | |||
| boue active: 17 phrases in 4 subjects |
| Agriculture | 1 |
| Environment | 11 |
| Life sciences | 4 |
| Technology | 1 |
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