Waste-water purification plant at a pulp mill in Plymouth, North Carolina, USA. Floating ventilation turbines suck in polluted sludge from the bottom of a vast basin and spray it out, mixing it with oxygen, thereby stimulating the propagation and appetite of the protozoa and bacteria that decompose the organic residue in the water water. (KEYSTONE/Georg Gerster)
Instructions
COPYRIGHTPFLICHTIG, SPECIAL FEES, SWITZERLAND AND AUSTRIA AND GERMANY ONLY, MANDATORY CREDIT
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