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Waste water treatment plants with a capacity exceeding 150,000 population equivalent as defined in Article 2(6) of Council Directive 91/271/EEC of the European Parliament and of the Council concerning urban waste-water treatment .
Waste water treatment plants with a capacity exceeding 150,000 population equivalent as defined in Article 2(6) of Council Directive 91/271/EEC of the European Parliament and of the Council concerning urban waste-water treatment .
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