The sewage treatment plant at Basse-Zorn, including all the latest technology, particularly in terms of ecology, includes a sludge methanization channel. This system reduces the quantity of residual sludge and allows the production of biogas that is reused to generate heat and electricity.

Examples of technical solutions implemented

Methanization: a sustainable, long-term and economic solution.
Methanization is the natural process of bacterial fermentation when oxygen is absent.

It stabilizes organic matter whilst producing:

  • A renewable energy, biogas (2/3 methane, 1/3 CO2)
  • A high-quality biofertilizer that can be used in agriculture.

Summary of know-how on the site

The operation of the station: arrival of waste water to sludge treatment via key stages such as pre-treatment, biological treatment, the pre-treatment of sludge, or CHP generation.

Key figures

Commissioning date: September 2014
Treatment capacity for: 30,000 population-equivalents (PE)

Daily volume of waste water treated:

  • In dry weather: 30,000 PE (residents: 20,500 PE, manufacturers: 9,500 PE)
  • In rainy weather: 45,000 PE

Main stakeholder

Syndicat des Eaux et de l'Assainissement Alsace-Moselle (SDEA)

Espace Européen de l'Entreprise - Schiltigheim - 1 rue de Rome CS10020


Players involved and their roles

Syndicat des Eaux et de l'Assainissement Alsace-Moselle (SDEA)

Communauté de Communes de la Basse-Zorn