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Since August 2009, an innovative system has been helping to treat wastewater from the water treatment plant at Saint-Just (5000 population equivalent) in the Hérault department (France). Called the ‘Zone Libellule’ (‘libellule’ is the French word for dragonfly, and an acronym for ‘LIberté Biologique Et de LUtte contre les poLluants Emergents’—Biological freedom and fight against emerging pollutants), it is made up of a series of wetlands containing over 7000 plants from 48 different species.

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