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Agglomeration of Paris waste water management From a hygienist issue to an environmental goal

Agglomeration of Paris waste water management From a hygienist issue to an environmental goal. Sanitation in Paris agglomeration in 19th and earlier 20th century. Many issues due to non correct sanitation (pollution of River and soil, cholera epidemics).

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Agglomeration of Paris waste water management From a hygienist issue to an environmental goal

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  1. Agglomeration of Pariswaste water managementFrom a hygienist issue to an environmental goal

  2. Sanitation in Paris agglomeration in 19th and earlier 20th century • Many issues due to non correct sanitation (pollution of River and soil, cholera epidemics)

  3. Sanitation in Paris agglomeration in 19th and earlier 20th century The answer = hygienic and ecologic approach All into the sewage

  4. Expansion of the sewage network to lead the water to land treatment 1810

  5. 1869

  6. Seine aval : 6 000 T Seine aval : 1 900 000 m3 La Morée : 50 000 m3 Seine centre : 240 000 m3 Grésillons : 100 000 m3 Marne Aval : 35 000 m3 Seine aval : 600 000 m3

  7. A public company 3 000 000 m3/day Staff : 1600 S: 2000 km2 Population : 8 500 000 inhabitants

  8. Financials aspects • 1. 102 Billions of Euro for 2005 • Outcomes : • 553 millions for immobilisation • 410 millions for the sewage and treatment plan operation • 139 millions for taxes, credits… • Incomes : • 300 millions of fees from users (inhabitants and industries) • 230 millions of subvention (AESN, Regional Authorities…) • 315 millions of bank loan • 170 millions writing off (amortization) • 87 millions from other • Tax fee : 0,6017 €/m3 in 2006

  9. The Future Several challenges • Improvement of the treatment plants for N and P • Stock and treatment of rain water with a return period of 6 months • Limitation and monitoring rain water runoff from new urbanization zone • Change sludge into a fertilizing product • Estimated Cost : 2 500 M€

  10. The most important gains • No more cholera epidemic • Less impact in North Sea, because of the flows reduction of P and N • No more fish mortality after big storms (500 T in the 90’s) • Better quality of the River Seine NH4+ always < 0,5 mg/l and conform to use it to make drinking water • more recreation activities : 3 species of fish in 1960 in the River Seine, 29 today ; rowing

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