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| épuration des eaux usées; traitement des eaux usées | |||
| épuration des eaux d'égout | |||
| tratamiento de aguas residuales: 47 phrases in 9 subjects |
| Chemistry | 2 |
| Environment | 32 |
| General | 1 |
| Name of organization | 2 |
| Politics | 1 |
| United Nations | 1 |
| Waste management | 3 |
| Water resources | 4 |
| Water supply | 1 |