The responsible way to recycle
sludge and wet biomass

Superefficient sludge recycling

Presenting a revolutionary new way to
convert wet biomass into biofuel

Wastewater sludge, industrial sludge, wet biomass – it's a problem that has to be dealt with. We have developed a robust industrial-strength process to recycle sludge into a valuable asset called biocoal.

We use a proven method – hydrothermal carbonization (HTC) – but with several innovations to make it into what is probably the most efficient sludge disposal method for the 21st century.


First full-scale HTC plant! 

C-Green's first full-scale HTC plant is off to Finland to be installed at Stora Enso's Heinola fluting mill.



Our goal is to turn hydrothermal carbonization (HTC) into a modern and cost-effective solution for almost any wet biomass sludge problem. Through innovation and modern industrial design, we believe our HTC solution will become the new environmental benchmark for nearly all sludge disposal problems. 


Impressive Dewatering

Go from 70-90 % water content down to 30 %, without using any external heat. It's simply the most efficient way to dry large quantities of wet biomass!


A patented invention that changes conventional, energy-intensive HTC into a process with no need for external heat energy.


High pressure and temperature levels eliminates bacteria, fungi, and viruses. The result is an odor-less and sterilized biocoal.


High capacity

Processes up to 10 tonnes of sludge per hour on a space equivalent to 5 parking spaces.

Making fuel

We recycle wet sludge into a dry economic biofuel with excellent energy properties. It's ideal for use in a biofuel heat and power plant.


The HTC process is continuous, and uses our own patented FracFlow reactor design. Easy to use and better performance than traditional HTC.



This is what biocoal (also called hydrochar) looks like. Our HTC process efficiently turns wet biomass into a dry biocoal product using a minimum of external energy. The process eliminates bacteria, fungi, and viruses, and immediately stops greenhouse gas emissions caused by organic decomposition.

Biocoal is perfectly suited as a biofuel in a modern heat and power plant.



Dry | moisture level around 30 %.

Valuable | high-energy content equal to standard wood-based biofuels.

Sterile | hygienic, safe and easy to transport.


If you're interested in our unique HTC solution for sludge handling, or have a pressing sludge problem please don't hesitate to contact us!

For more information

Please contact us at:


This activity has received funding from the European Institute of Innovation and Technology (EIT). This body of the European Union receives support from the European Union's Horizon 2020 research and innovation programme.