Fluidized Bed
Final DisposaL
High Performance
Heat recovery


Thermylis® HTFB Thermal Oxidation is a sustainable technology to dispose of sludge. It is highly efficient, odor free and can generate useful heat for the production of process steam or electricity. The technology is proven, safe and environmental friendly.


As land becomes more scarce and sludge handling regulations grow more stringent, fluid bed incineration is becoming widely accepted for sludge disposal. In a fluid bed incinerator, water is evaporated and organic materials are combusted, eliminating odors and reducing the sludge to a much smaller quantity of inert ash (as low as 7% by weight). Land requirements and air pollution are reduced, protecting the environment.


Thermylis® HTFB consists of three zones: a windbox, a sand bed, and a freeboard. The term “fluid bed” refers to the violent boiling action of the sand bed, which occurs when air is blown through from below. To ensure that the air passes evenly through the sand, it must first pass through the windbox and a refractory arch distributor, where special alloy tuyeres ensure even distribution of the air. To fully take advantage of the turbulent mixing, dewatered sludge and auxiliary fuel (if required) are introduced directly into the bed, where they are instantly combusted at 680°C.

In the next stage, combustion gas and evaporated water flow upward into the teardrop-shaped freeboard, where the bed material is disengaged. Operating at 850°C, the freeboard provides sufficient residence time to polish the gas and to complete the combustion. The “three T’s” - turbulence, time and temperature - make fluid bed incineration the most economical and environmentally sound method to dispose of sludge.


Thermylis® Process Video

Thermylis® HTFB Thermal Oxidation
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Product sheet

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Main features

  • Maximum Heat Recovery
    Stress-free and self-supporting refractory arch and refractory lined windbox allow maximum heat recovery and autogenous combustion if the sludge is undigested and dewatered up to 26-28% DS.
  • Minimal Sand Loss and Optimal Combustion
    Teardrop-shaped reactor decelerates the combustion gas, disengaging the sand and optimizing the combustion.
  • High Efficiency
    Sludge fed in the turbulent bed enhances combustion and reduces the emission of pollutants.
  • Shorter Startup and Less Fuel Usage
    Preheat burner is installed in the windbox to allow cost efficient cold starts.


  • Municipal wastewater solids
  • Pharmaceutical waste
  • Chemical and paper mill waste
  • Petrochemical waste