MODEL RELEASED. Sewage treatment. Worker holds samples of treated and untreated sewage. Sewage treatment involves using mechanical filtering and bacterial action to remove organic materials from water. The bacteria may then be filtered out before the water is discharged into a river or the sea | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Maximilian Stock |
Bildgröße: | 3642 px × 2723 px |
Modell-Rechte: | vorhanden |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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