Expertise
Areas of application for our technologies
SynGas CHP Module
The CHP module is characterised by its particularly high electrical energy recovery from the dried sewage sludge. The synthesis gas produced in the fluidised bed reactor is converted into electricity and heat in a highly efficient combined heat and power plant (CHP) after a purification stage. The electrical energy is used to cover the company’s own requirements or to feed into the grid, while the heat is used for sludge drying.
As a large proportion of the energy contained in the synthesis gas is converted into electricity in the CHP module, less thermal energy is available for drying the sewage sludge.
This energy deficit can be covered by utilising the available energy from digester gas. The waste heat from the drying process is in turn available for heating the digestion towers.
This means that the overall system remains thermally self-sufficient and the use of other energy sources is avoided.
If heat has to be extracted for heating the digesters, the digesters can now be heated using the recoverable low-temperature waste heat from the sewage sludge drying process. This means that the overall system remains thermally self-sufficient without the need for an additional energy source.
Advantages of the SynGas CHP module:
- Utilisation of the high efficiency of CHP units
- Patented technology
- Compact flue gas cleaning due to low air mass flow during gas generation
- Technological contribution to an energy self-sufficient sewage treatment plant

Sewage sludge with a dry matter content of 85% – 95%
Limestone for mixing as the first desulphurisation stage
Sub-stochiometric combustion of carbon at 870 °C to produce synthesis gas. Destruction of all organic toxins.
Discharge and cooling of the phosphorus-rich and virtually carbon-free ash granulate
Coarse dedusting of the synthesis gas in a cyclone separator
Heat recovery from synthesis gas for supply in the fluidised bed reactor
Fine dedusting of the synthesis gas
Further cooling of the synthesis gas and separation of dust residues, tar and harmful gases
Activated carbon filter to remove heavy metals and other pollutants
Utilisation of the purified synthesis gas in a combined heat and power plant to generate electricity and process heat
Heat recovery from the exhaust gas of the CHP unit
Process description: CHP module
Thermal treatment
1) Sewage sludge with a dry matter content of 85 – 95 %
2) Limestone for mixing as the first desulphurisation stage
3) Sub-stochiometric combustion of the carbon at 870 °C to produce synthesis gas. Destruction of all organic toxins
4) Discharge and cooling of the phosphorus-rich and almost carbon-free ash granulate
Synthesis gas purification and cooling
5) Coarse dedusting of the synthesis gas in a cyclone separator
6) Heat recovery from synthesis gas for provision in the fluidised bed reactor
7) Fine dedusting of the synthesis gas
8) Synthesis gas scrubbing: further cooling of the synthesis gas and separation of dust residues, tar and harmful gases
9) Activated carbon filter to remove heavy metals and other pollutants
Energy generation
10) Utilisation of the purified synthesis gas in a combined heat and power plant to generate electricity and process heat
11) Heat recovery from the exhaust gas of the CHP unit