Sewage sludge feed
The sewage sludge is fed into the system via two moving floor containers. The sewage sludge is transported into the system using screw conveyors.

Sewage sludge hydrolysis
By mixing the sewage sludge with an alkaline digestion agent, hydrolysis takes place in which organic substances are broken down and form water-soluble salts.

Sewage sludge dewatering
A multi-stage vacuum evaporation process releases water and ammonia in the form of vapour. By washing with sulphuric acid, the ammonia is separated in the form of ammonium sulphate, which is one of the products obtained.

Autothermal reforming
In an autothermal reformer designed as a rotary tube, residual water in the form of water vapour and then organic salts are converted into combustible gas at temperatures of 700 - 800 °C.
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Gas purification and utilisation
The resulting process gas is cleaned using basic scrubbing, iron hydroxide solution and activated carbon filtration and then converted into electricity and heat in a CHP plant.
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Recovery of the digestion chemicals
The powder discharged from the rotary tube is eluted with water, resulting in a solution of around 50 per cent. The inorganic, undissolved components are separated using a centrifuge. Phosphorus is removed from the remaining solution and the remaining solution is fed back into the process.