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Biological anaerobic treatment of sewage.

Biological anaerobic treatment of sewage.

T825/0088

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Credit

MAXIMILIAN STOCK LTD / SCIENCE PHOTO LIBRARY MAXIMILIAN STOCK LTD / SCIENCE PHOTO LIBRARY

Caption

Sewage treatment. Bacterial anaerobic treatment of sewage in aluminium-clad buildings at a sewage treatment plant. The buildings contain closed chambers or digesters in which sewage sludge is digested by bacteria in oxygen-free (anaerobic) conditions. This digestion process lasts for 10- 30 days and reduces the sewage to carbon dioxide and methane and a humus-like material. The methane can be collected and used as fuel. Photographed in Bavaria, Germany.

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