Work package 2: Optimisation of thermal energy recovery technologies

Recovering thermal energy is a key to unlock the sustainable urban water cycle, as it is the energy source with the highest recovery potential. This second work package will demonstrate the advantages of recovering thermal energy from the urban water cycle and its use in several applications. To achieve the overall INNERS goal of optimising energy use in the urban water cycle, the partners will develop new ways of recovering/producing energy so that energy consumption in the whole urban water cycle is reduced. With the outcomes of work package 1, locations will be selected where thermal energy can be reused. The results of the demonstration projects will be used to show that thermal energy can be recovered and usefully applied, and act as a brick stone in work package 4.

The objectives of this work package are:

  • Developing techniques for thermal energy recovery from waste water.
  • Improving the energy balance of the urban water cycle.
  • Demonstrating the use of innovative heat recovery systems from sewer and wastewater treatment plant (WWTP).
  • Reducing the consumption of fossil fuels and emission of greenhouse gases within the urban water cycle.


  • Action 1: collecting relevant data at various locations in the urban water cycle, based on measurement programmes.
  • Action 2: feasibility studies on the thermal energy recovery potential.
  • Action 3: demonstration projects.