HUBERT RAGUET / LOOK AT SCIENCES / SCIENCE PHOTO LIBRARY HUBERT RAGUET / LOOK AT SCIENCES / SCIENCE PHOTO LIBRARY
Chemical toxicity testing. Scientist testing the biodegradability of chemicals in activated sludge. Activated sludge is a stage in the process of treating sewage where the organic content has been reduced. Photographed at the International Centre for Toxicology (CIT), Evreux, France.
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