l’Eau, votre service public l’Eau, votre service public l’Eau, votre service public Implementation of the UWWTD in relation to the WFD SDEA’s input 03/03/2020, Brussels/Bruxelles
Implementation of water directives l’Eau, votre service public l’Eau, votre service public in France Implementation of UWWTD through french water laws (« Loi sur l’eau ») – 1992, 2006 and regulations (1994, 2007, 2015) National effort towards WWTP and networks (all sizes from 20 EP) Rainfall admission limitations 2 nd wave : raintime works (2007, enforced in 2015) WFD : coordination through water policies and agencies, but more difficulties to find stakeholders responsible for quality status Results : progressive wastewater management & river status improvement Some coordination and uncertainties remain for some cases (timing, costing , …)
1 st source of uncertainty: notion of l’Eau, votre service public l’Eau, votre service public « Agglomeration » (French/English) WWTP 1 000 000 PE WWTP Agglomération (french 25 000 PE sense) : large urbanization group WWTP 2000 PE ? 1, 2 or 3 UWWTD agglomerations? If 1 : should the 2000-PE WWTP apply the 1 000 000-PE WWTP regulations? Should all 3 use the same treatment standard (ex. N, P) if the smallest WWTP is the only one in an eutrophication-sensitive area?
l’Eau, votre service public l’Eau, votre service public 2 nd source of uncertainty: notion of « costs » UWWTD Different wordings = different studies for the same project? Art 3 : excessive costs France considers those 2 notions as totally different : could it be a better WFD coordination with similar terms? Art 4 : disproportionate costs Are costs exceding only a part of a resolution excessive?
3 rd source of uncertainty: l’Eau, votre service public l’Eau, votre service public prioritisation of approaches UWWTD MEANS objectives (treat all/most wastewaters, with few reference to receiving waters) WFD RESULTS objectives (good status)
Rainwater effects on unitary l’Eau, votre service public l’Eau, votre service public devices (1/2) Unitary devices = takes both waste waters and urban rainfall waters Deemed appropriate within the 3 first quarters of 20th century – treatment of weak rainfall flows and first / most polluted flow Storm discharges in case of heavy (or, in some cases, moderate) rain (direct discharge of diluted waste water)
Rainwater effects on unitary devices (2/3) – discharge l’Eau, votre service public l’Eau, votre service public limitation UWWTD, annex 1 : Definition far less precise than those in DWD : Which number may be deemed « acceptable »? 20? 30? What is an acceptable dilution rate? 5% ? 10%? Risk of uneven or inequitable application in member states . Precision? Benchmark? Inacceptable discharge according to local or No reference to WFD results MS regulations Insufficient WFD/UWWTD coordination risk : Work to do, but will it be the most efficient one?
Rainwater effects on unitary devices (3/3) – directives l’Eau, votre service public l’Eau, votre service public coordination / exemple Overflow 1 : acceptable discharge in bad-status river Works to lessen overflow 2’s impact may : - Report some of the overflow to overflow 1, thus worsening the status of the Overflow 2 : unacceptable discharge in good-status most polluted river river - Simply consume most credits available for a less- efficient project
l’Eau, votre service public Thanks for listening!
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