Contents
Note 1: Reduction in relation to the load of the influent or to the load generated in an agglomeration if the same level of environmental protection can be ensured.Note 2: If a fraction of treated urban wastewater is used for agricultural irrigation, nutrients in that fraction may be included in the calculation of the influent load and be excluded from the discharged load.Note 3: In exceptional situations due to specific local circumstances, natural nitrogen retention may be taken into account in the calculation of the minimum percentage reduction in Member States where natural nitrogen retention was taken into account in the calculation of the minimum percentage reduction of nitrogen referred to under Table 2 of Annex I to Directive 91/271/EEC and where it is demonstrated that part of the nitrogen originated from urban wastewater can be eliminated in the receiving waters until 31 December 2045 for the calculation of the minimum percentage reduction of nitrogen referred to in Table 2 of this Annex if all the following conditions are fulfilled:
(1)the average hydraulic retention time of the discharged effluent is at least 1,5 years before it reaches the area sensitive to nitrogen designated under Article 7(2);
(1)no adverse effect on the environment is ensured;
(2)a continuous monitoring and assessment programme of the total nitrogen parameter is ensured:
(a)in the outlets of all urban wastewater treatment plants and where relevant in the urban runoff from agglomerations of 10000 p.e. and above located in the catchment area of the area sensitive to nitrogen designated under Article 7(2);
(b)in the relevant inlets of the area designated under Article 7(2);
(c)at the representative sampling locations in the receiving waters and relevant water bodies in the catchment area of the area designated under Article 7(2);
(2)excessive costs or excessive energy consumption would be required to reach the values for nitrogen in Table 2.
(3)the minimum percentage reduction for nitrogen of Table 2 is met; that percentage shall be calculated on the basis of the data collected from continuous monitoring and assessment programme referred to in point (2);
(4)it can be demonstrated that nitrogen releases from urban wastewater treatment plants in the catchment area are not harmful for the environment, including for biodiversity, and human health and do not modify the ecosystem;
(5)the concentration of nutrients in the areas referred to in point (c) of condition (2) are compliant with the condition set under Annex V.1.2.1 to Directive 2000/60/EC to define good ecological status of those areas;
(6)the use of natural nitrogen retention is reported to the Commission in accordance with Article 22(1)(a), as well as to potentially affected neighbouring Member States, together with all the elements necessary to verify that conditions (1), (2), (3), (4) and (5) are fulfilled.
Note 4: This requirement shall apply on 1 January 2025 to existing urban wastewater treatment plants obliged to meet the deadlines established under Article 7(1) and to agglomerations under Article 7(3). Until those deadlines are met, the obligations of Article 32(3) shall apply to those urban wastewater treatment plants.Note 5: Where the temperature in the effluent of the biological reactor is below 12 oC, the results of the samples taken may be excluded from the calculation of the annual mean for nitrogen as referred to in point (4)(c) of Part C of this Annex where all the following can be demonstrated:
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