GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY
Effluent treatment. Worker holds samples of treated and untreated effluent from a paper production plant. The effluent was treated using biological methods. These techniques typically use bacteria to break down pollutants. The bacteria may then be filtered out before the water is discharged into a river or used again in the paper mill.
Model release available. Property release not required.