By G. Thomas
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The technical solutions are numerous. For example we can mention (3, 4, 5, 6): – process using membranes: reverse osmosis, electrodyalisis, – ion exchange processes: permutation of nitrate ions by chloride and/or bicarbonate ions, – biological processes: heterotrophic with addition of inorganic carbon or by using hydrogen as a reducing reagent. Research started in 1978 led to the construction in 1983 of the first heterotrophic biological facility in the world applied on an industrial scale at Eragny-sur-Oise (France).
It therefore seems quite impossible to determine a pesticide index. Analysing the pesticides one by one, appears physically very difficult. In France, for instance, over three hundred active substances are used in agriculture in formulations numbered in thousands. The EEC Directive 80/778 tells us that “by pesticide and related product is meant: – insecticides, – herbicides, EUROPEAN DRINKING WATER STANDARDS 21 – fungicides, – PCB and PCT. It must be remembered that drafting of the directive 80/778 began in 1974/75 at a time when the only compounds investigated were organo-chlorinated and organo-phosporous pesticides, and often for the latter only these that respond to electron capture, which meant that it was possible to quantify all the compounds present with a single analysis.
In relation to water supplies, the NRA has the following duties: to control water pollution to maintain and improve the quality of waters used for water supply to operate the water resource abstraction licensing system to ensure the proper management of water resources and to assess the adequacy of water resources against future needs to assess the quality of surface waters intended for abstraction of drinking water, under the terms of the EC Directive (75/440/EEC). There are other duties relating to the promotion of nature conservation and recreational use of waters.