ANDRITZ offers a broad range of innovative recycling technologies for material separation and recovery, treatment of various types of waste and rejects from the paper industry, and the production of renewable energy. In addition, ANDRITZ is a leading supplier of plants based on Bubbling Fluidized Bed (BFB) and Circulating Fluidized Bed (CFB) technologies for boilers, which are ideal for a wide range of combustion applications.

Processing of organic waste for utilization in biogas plants

ANDRITZ has developed innovative technology for optimum preparation of packaged food, organic waste, and energy crops for the fermentation process in biogas plants. The ADuro Bio-QZ shredder breaks down the cell structure of the input materials, such as organic waste, corn and whole crop silage, grass clippings, farmyard manure, restaurant and kitchen waste, and packaged food – always providing an optimum contact surface for the bacteria. The gas formation starts measurably faster and more intensively, which can reduce the duration of the overall process substantially and increase the cost-effectiveness of the biogas plants by up to 30%. The strength of the ADuro Bio-QZ is in separating organics from food packaging by crushing and stirring the material in one process. The output is unwrapped organic waste, suitable for pumping.

Process advantages with the ADuro Bio-QZ shredder

  • High throughputs
  • Wide range of different materials
  • Higher gas yield due to faster gas formation
  • Packaging removed from organic material
  • Stable processes
  • Homogeneous substrate suitable for pumping
  • Scum layers dissolve quickly
  • Easy to install in existing plants


ADuro Bio-QZ shredder


ANDRITZ Recycling

Fluidized bed technology: Decades of experience go into every ANDRITZ fluidized bed boiler

ANDRITZ is a leading supplier of plants based on Bubbling Fluidized Bed (BFB) and Circulating Fluidized Bed (CFB) technologies for boilers. These different technologies are distinguished by capacity, fuel, and application. Excellent mixing and heat transfer make fluidized bed technology ideal for a wide range of applications. A variety of coals and lignites can be combusted, as well as clean biomass (bark, agricultural, forestry, and sawmill residuals) and many other fuels (demolition wood, refuse-derived fuels, peat, various sediments, etc.).


EcoFluid – BFB technology
In a BFB unit, fuels are thoroughly mixed in a dense suspension of fluidized bed material in the lower furnace. BFB systems operate at a moderately low fluidization velocity and under controlled temperature conditions. Thanks to the large heat capacity of the fluidized bed material, which is mostly sand, the combustion conditions are ideal for biomass and recycled fuels with varying moisture contents. In many installations, mixed fuels are fired simultaneously.

PowerFluid – CFB technology
With CFB technology, the flue gas velocity in the furnace is higher and the bed is expanded and entrained with the flow. The bed material flows with the flue gas through the furnace, after which the material is separated by cyclones and returned to the lower furnace. CFB technology also allows an extremely wide range of fuels to be fired in the same unit. The efficient mixing and relatively low combustion temperatures contribute to low emissions of carbon monoxide, hydrocarbons and nitric oxides.

Advantages of ANDRITZ fluidized bed technologies

  • Fuel flexibility
  • High burn-out and conversion rates
  • Inherently low emissions
  • Excellent availability, with long continuous operating periods
  • Operational flexibility, with good load following capability
  • Minimal maintenance
  • Proven design


Thomas Strasser 
ANDRITZ Power Boilers
Waagner-Biro-Platz 1
8074 Raaba-Grambach
Ph.: +43 (316) 501 328

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