Medium-Temperature Belt Dryers

Our HUBER Middle Temperature Belt Dryers BT are automatically and continuously operated and optimally suitable for energy-saving and eco-friendly drying of municipal and industrial sludges.

They are heated with medium-temperature heat of 90 – 130 °C, e.g. with cooling water from a combined heat power (CHP) cogeneration system. Sludge detention time in the dryer is about 150 minutes.

Thereby our Belt Dryers ensure a granular, disinfected (class A), easy and safe to handle biosolids product in compliance with European and international standards.

Sistem konsepti

Sistem konsepti

Ek bilgi ve linkler ile detaylı, interaktif görünüm için resme tıkla
Ek bilgi ve linkler ile detaylı, interaktif görünüm için resme tıkla.



Advantages of HUBER Medium-Temperature Belt Dryers

  • Dry, granular and safe to handle product
  • Dryness can be selected from 65 % to over 90 %DS
  • Suitable for simultaneous sludge disinfection
  • Continuous automized operation, independent of the climate
  • Low wear, moderate temperature
  • Safe operation due to little dust generation
  • Exhaust deodorization with scrubber and bio-filter
  • Low heat consumption (ca. 0.9 kWh per kg water evaporation)
  • Supply of medium-temperature heat, e.g. from a cogeneration system
  • Low operation and maintenance costs

Uygulama raporları



Disinfection in HUBER Medium-Temperature Belt Dryers

As long as the sludge is humid, water is rapidly evaporated and the sludge does not become hotter than 50 to 55 °C, because it is kept cool by the evaporation enthalpy. After the sludge has travelled on the belts about half way through the dryer, it reaches solids contents of 70 – 80 %DS, water evaporation slows and its cooling effect is reduced. Now the sludge is heated up further and reaches temperatures over 70 °C, only slightly less than the temperature of the drying air.

If the sludge is maintained at a temperature of minimum 70 ° for at least 30 minutes, it is safely disinfected. We investigated the situation in one of our full-size belt dryer installations and could prove that this requirement was met. Analysis of faecal coliforms and salmonella confirmed sufficient disinfection.