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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Maximilian Stock |
Taille de l’image : | 4660 px × 3552 px |
Model Release : | Disponible |
Property Release : | Non requis |
Restrictions : |
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