From sludge to fertilizer, Apeldoorn, The Netherlands

The Regional Water Authority ‘Vallei en Veluwe’ is one of the frontrunners in The Netherlands concerning the implementation for a sustainable and economical feasible solution for sewage sludge. In the Apeldoorn region they will produce a much needed fertilizer, by applying both innovative TurboTec® technology as well as additional treatment steps, out of sewage sludge. According to this Regional Water Authority the waste from the municipal sewers can be seen as the ‘new gold’.

“This investment will, in time, bring significant savings. This way we keep the wastewater treatment affordable for citizens and businesses.”
Tanja Klip, Chairman of the Regional Water Authority

Heating, mixing and separation
The patented TurboTec® THP process treats organic material and biomass at a standard pressure of 4 – 6 bar and a temperature of 140 – 160 °C. This treatment also ensures hygienisation of the final biomass cake and minimizes the use of costly chemicals. The steam consumption for heating is limited to less than 800 kg/tTS due to the efficient heat recovery via heat exchangers and an innovative mixing and separation step.

torbotec                  sustec-logo

Increasing capacity of digesters
Biomass hydrolysis of waste activated sludge results in up to 35% more biogas in the digestion, while in the improved final dewatering more than 30% TS can be achieved. By using TurboTec®THP the capacity of existing digesters can be increased or smaller digester can be installed for new treatment plants. The TurboTec®THP continuous process has reduced capital costs and significant lower operational costs compared to conventional batch processes.

DMT group and Sustec
Since may 2016 Sustec B.V. is part of the DMT group. DMT and Sustec share a wide range of global markets and applications, including municipalities, water companies and a variety of industries. The possibilities of combining the biogas upgrading technology with recourse recovery technologies, enhances the opportunities for municiplities to turn sewage and other waste streams into value.


“Sewage sludge is the new gold” (article in Dutch:)