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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Raguet, Hubert / Look At Sciences |
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