Dryer Applications

Sewage Sludge Dryer:

  • Filter Cake Range 15-35% DS (Dry Solids)
  • Fuel Options: Natural Gas (NG), Renewable Natural Gas (RNG),   Combined Heat and Power (CHP), Propane or Combination
  • Class A Sludge Produced
  • Disposal Cost Reduction

The sewage sludge is fed from digesters or sedimentation/storage tanks using a sludge loading container into a screw conveyor. There the sludge is mixed to a higher DS content before it enters the dryer.

During the procedure, the hot exhaust gases are transported from the gas and biomass combustion directly into the material dispersal of the dryer. This allows for almost ideal physical conditions for the evaporation of water.

Biomass Dryer:

  • Fuel Options: Natural Gas (NG), Renewable Natural Gas (RNG),   Combined Heat and Power (CHP), Propane or Combination
  • Uses: Fertilizer, Bedding, Animal Feed
  • Class A Sludge produced


A large number of biomass residues are produced in agriculture, livestock farming, landscape maintenance as well as industrial food production.


  • Food Waste
  • Marc (Fruit juice, Wine, etc.)
  • Manure (Cow, Chicken, Pig)


These products are normally wet and must be disposed of properly, which can be complex and expensive. It is increasingly less acceptable to dispose of these materials in the field since they can be high in dangerous bacteria. Uncontrolled disposal is associated with an over fertilization of the grounds and leakage into our ground water.

Our STR biomass drying procedure is not only an interesting economic solution but turns a disposal problem into a recycled product which can be re-integrated in different ways into an environmentally-friendly and responsible cycle.

Our cyclone combustion chamber and biomass burner can use all types of biomass fuels for added heat in the dryer. This not only ensures a highly efficient drying procedure but guarantees it at the lowest operational costs.


Digestate Dryer:

  • Digestate Slurry Range 3-10% DS
  • Fuel Options: Combined Heat and Power (CHP), Renewable Natural Gas (RNG), Natural Gas (NG), Propane
  • Uses: Fertilizer, Bedding, Animal Feed
  • Class A Pellets produced

Biogas operators face increasing challenges in respect to the liquid manure ordinance, storage issues, the nutritional balance of fertilizer, and the application of liquid digestate. Pelletizing digestate is an excellent way to combat these challenges, producing a Class A product in accordance with the EPA guidelines.

Benefits of Digestate:

  • Turn heavy liquid digestate into a dry product to lower transport costs
  • Energy from a CHP can be used instead of expelled
  • Keep all beneficial nutrients intact while eradicating harmful bacteria
  • Store more digestate by reducing its volume
  • Either use the resulting pellet for fertilizer and/or market it for a profit


An exhaust gas drying procedure is not only a very interesting economical solution to waste management problems, but considerably improves the overall situation of the plant and serves as active environmental protection.

Liquid digestate is mixed to a moisture content of 30% DS by a dry material return line and screw conveyor and then transported into the dryer. In less than 6 minutes 90% DS pellets are produced. Your digestate product is completely sterilized, meeting the EPA’s Class A biosolids requirements.

The entire process is fully automated and is adjusted to varying outputs by means of an intelligent control system. No matter what your power source(s) are, the drying process is regulated automatically. An ARC (active remote control) monitors the procedure in real time and saves all drive, temperature and control-relevant data in an interval of 5 seconds.

If you have a CHP, much of the thermal energy from its exhaust gas flow can be directed into the dryer instead of being discharged into the atmosphere. The liquid is completely evaporated, but all nutrients remain in the dried digestate in a concentrated form. You then have a valuable fertilizer for your own purposes and/or for marketing purposes.


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