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| aftertreatment | |||
| secondary treatment Stage of the process of waste water treatment: following primary treatment by sedimentation, the second step in most wastewater systems in which biological organisms decompose most of the organic matter into a innocuous, stable form; secondary treatment; intermediate level treatment; secondary biological treatment | |||
| tratamiento secundario: 9 phrases in 2 subjects |
| Environment | 6 |
| Water resources | 3 |
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