DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Waste water treatment. Waste water in the clarification stage of treatment at a sewage works. During this stage, aerated effluent traverses slowly across the perimeter of large tank. The bacterial sludge contained in the effluent settles to the bottom of the tank and is returned to the aeration stage of treatment.
Model release not required. Property release not required.