 |
| |||
| aeration tank (Belebungsbecken); aerator (Belebungsbecken) | |||
| aerotank; activated sludge basin | |||
| aeration basin; aeration tank; bio-aeration basin; floculation tank | |||
| Belüftungsbecken: 5 phrases in 2 subjects |
| Construction | 4 |
| Natural resourses and wildlife conservation | 1 |