Waste | Sewage Sludge

The disposal of sewage sludge has become a major challenge due to new legislation. UNIWASTEC produces green electricity and green hydrogen from it.

Resource-saving sewage sludge treatment

The current way of treating sewage sludge – mono-incineration – pollutes the environment and wastes resources.

Furthermore, it doesn’t make sense from an energy balance: apart from the negative environmental effect, the gained energy from incineration is used to dry the sewage sludge in the first place, in order to make it combustible.

UNIWASTEC processes sewage sludge by hydrothermal carbonization, thermolytic cracking process and evaporation electrolysis. Thereby we generate green power and produce green hydrogen.

Our holistic solution is resource-saving, climate friendly and economically highly efficient. We ensure the statutory recovery of the  valuable phosphate and exploit the maximum amount of energy. We create a possibility for carbon capture and make sure that CO2 is permanently removed from the material cycle. 

Core Advantages

Phosphorus recovery

We isolate the phosphate using special catalysts. As a result, our phosphate in the form of a granulate is directly available for plants. In contrast, mono-incineration stores the ash on special disposal sites, hoping to find appropriate technical and industrial solutions in the future to extract the phosphate.

Energy recovery

Our gasification technology enables us to harness 99% of the energy contained in sewage sludge. Mono-incineration wastes considerable energy quantities through the combustion of wet sewage sludge. UNIWASTEC is capable of recovering 1.5 MWh of green electricity from one ton of HTC coal gained from sewage sludge.

Carbon capture

Our synthesis gas production is completely emission-free. Using the carbon in the construction industry and avoiding nitrous oxide emissions, we can save at least 1650 kilograms of CO2 equivalents per ton of sewage sludge disposed of compared to mono-incineration.

Attractive disposal price

Due to our holistic approach and the production of green electricity and green hydrogen from sewage sludge, we are able to offer a much better disposal price than the ones of other current market players. UNIWASTEC provides its services based on a sewage sludge agreement and thereby ensures long disposal safety.


We are able to produce the products synthetic natural gas, green electricity, synthetic fuel and green hydrogen from the educts waste, used tires, sewage sludge, liquid manure, biomass, and wastewater.

Did you know?


Our solution is suitable for all those with an annual sewage sludge volume of at least 7,680 or more tons or, respectively, a population equivalent of 100,000.

  • Large sewage treatment plants
  • Public sector: federal states, special purpose associations, cities and cantons responsible for sewage sludge recycling
  • Industrial companies
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