Recovery of by-products from the urban metabolic rate

What if we looked at the city differently?

Let’s consider it as a living organism equipped with its own metabolic rate which, once nourished, inevitably generates a volume of waste. By taking out their bins and flushing away their waste water, the domestic user (which includes all of us) gets rid of the two by-products of this urban metabolism.

What are the new ways to better sort this waste at its source and develop material and energy recovery for these two kinds of waste?

Through a balance of their respective input and output material flows, SIAAP (the Île-de-France Urban Sanitation Service) and Syctom (the metropolitan household waste agency) will answer these questions.

Pierre Hirtzberger


General Manager of Technical Services at Syctom






Wednesday, décembre 9th

11h00 - 12h30

Climate Generations Areas - Room 7

Related to the COP21 Conference program

Free entry

Simultaneous english

Those involved


  • Denis Penouel, Assistant General Manager of SIAAP in charge of forecasting
  • Lionel Benard, Head of the environment department, Environmental Health Directorate at SIAAP
  • Fabien Esculier, Research worker, Ponts Paris Tech
  • Pierre Hirtzberger, General Manager of Technical Services at Syctom

  • Michel Bonhomme, Scientific Director at Arkolia Energies
  • Alexandra Delongvert, Driver biogas operation, Direction of major projects at SIAAP

This side event will deal with the prospects for an interaction between these two stakeholders of managing the waste product flow from the Greater Paris area, from the point of view of the challenges of recycling and recovering them..


On the programme:

  • A presentation of the balance of these deposits (material, carbon, nitrogen and phosphorus flows) and the effect of the waste processing business on the greenhouse gas effect.
  • A reflection on the new methods of the circular economy, with the example of an innovative process of methanisation applied to the codigestion of sludge from wastewater and the organic fraction of household waste.