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Sludge Thermal Hydrolysis - Exelys

Exelys™ continuous thermal hydrolysis

Exelys™ is an innovative and complete sludge reduction solution that works in continuous mode, combining thermal hydrolysis and anaerobic digestion.

By coupling thermal hydrolysis and anaerobic digestion, Exelys™ offers better performance than conventional digestion and optimizes sludge treatment by producing:

  • 25 to 35% less dry matter
  • 30 to 50% more biogas
  • No odours
  • A pasteurised digestate, for safe agricultural reuse.

Exelys™ treats all kinds of biological sludge and can also handle grease.

Features & Benefits

Exelys works continuously and has simplified operation and maintenance with a small footprint.

This process allows:

  • Reduced digester size
  • Reduced operating costs:

    o Less sludge to remove
    o At existing installations, the digestion capacity can be increased by upto 100%.

  • Income is generated from:

    o Processing external inputs through co-digestion
    o Selling the energy produced by co-generation or producing bio-methane

Exelys™ is a solution that guarantees energy and environmental performance, thanks to:

  • Conversion into "green" electricity via co-generation
  • Bio-methane production (for injection into the network or as fuel)
  • Low steam consumption
  • Reduced carbon footprint
  • Many possibilities for using biogas: with external input (co-digestion), energy self-sufficiency or even a positive energy footprint may be achieved by the plant.

Exelys™ combines with other Veolia sludge treatment processes such as Athos™ (hydrothermal oxidation), Pyrofluid™ (incineration), BioCon™ (thermal drying), Solia™ (solar drying) to offer even more sustainable solutions.

Technical details

Continuous thermal hydrolysis operating 24 hours a day with feed and removal levels that are adjustable in real time, Exelys™ operates under controlled temperature (165°C), pressure (9 bar) and duration time (approximately 30 minutes) conditions.

The system is controlled by a PLC that modulates the steam flow rate in line with the amount of sludge injected.