| ||In this basin for deoiling waste water, air is forced through the liquid to separate the oil contained in the water. The oil forms a white foam which can then be removed or incinerated. Two successive processes are required for depollution: physical and chemical separation of solid elements, followed by biological purification which breaks down the organic elements responsible for asphyxiating polluted rivers. With 15,000 purification centres throughout the country, France has one of the best purification networks in the world. However, only 49% of the water is depolluted because the centres have only a limited capacity and not all homes are covered. Other procedures, such as lagooning, are being developed to purify water. This ancient method of natural water purification uses the sun, wind and suitable plants such as bamboo, to absorb the pollutants. Waste water produced by the town of Rochefort in France (for example) is all processed using the lagooning method.
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