Biogas Digestate Drying Systems

Designed in Norway. Delivered Worldwide.

Convert digestate into a valuable resource by Drying

Biogas digestate and Municipal wastewater treatment plant (MWWTP) sludge are known to be extremely tricky to dry because of their tendency to transform to a glue phase. Biogas digestate is generally an extremely tough application with severe wear and tear on the drying equipment.

Fjell Turbo Disc Dryer has proven track record for these tough applications. The first unit was installed and in operation in 2001. Deliveries are worldwide, including process plants in Norway, Italy, Saudi-Arabia, Holland and Japan.

Biogas plant digestate ready for drying in Fjell Turbo disc dryer.

Drying solutions

Part drying or scalping for incineration and production of energy

We increase relative portion of dry matter (DM) on wastewater from approximately 20% to 40% for the sludge to be fed directly to incineration.

Full drying for fertiliser production

We deliver special design mixing system that increase dry matter DM up to 93%. Important nutrients such as nitrogen and phosphorus will remain in the sludge. Such sludge is useful as a basis in fertilizer production.

Low Energy consumption

With our patented process solution, the steam consumption can be reduced by up to 40% compared to a standard dryer.

Explore our TD dryer
Fjell engineer studying P&ID of a digestate dyer plant.

The source of biogas digestate.

Sewage, livestock- & farmed fish feces, and food residues can be used as a source for green energy in a biogas plant. Our dryers are heated indirectly by steam, and biogas produced may very well be used as source for heating.

After gasification you will have approximate 50% of your input raw material as a biogas digestate. This digestate is still rich in nutrients such as nitrogen and phosphorus. After dewatering the digestate must rapidly be used or dried, if not it starts to decay. Heat during drying process will sanitize the sludge and removal of water content to less than 10% will make the digestate storage stable. The dried digestate can be used in new value chains like fertilizer production.

Dried sludge from biogas can also be used in incineration plants. The heat generated can be recovered from the flue gas stream and reused directly and/or converted to electrical power.

Biogas plant. Fjell Turbo disc dryer can dry the digestate. Photo: Shutterstock