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

Discover the historical shift from sanitation challenges to environmental objectives in 19th and early 20th century Paris agglomeration. Explore the innovative approaches, financial aspects, and future challenges of sewage network expansion and water treatment development. Learn about the significant gains in public health, environmental impact, and water quality improvement along the River Seine.

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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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