Turning wet sludge
into solid value
We transform wet biowaste into dry, climate-smart HTC biocoal.
“With this technology, we can save both the environment and costs.”
— Mikael Sillfors, Development Manager, Heinola Fluting Mill, Stora Enso, Finland
Highlights
Mobile pilot in Rotterdam, The Netherlands
HTC-laboratory in Stockholm, Sweden
HTC Biocoal
HTC biocoal is a solid material produced by dewatering the slurry from the HTC process. It is sterile, odorless, easy to store and friendly to handle – with significantly reduced volume and weight compared to wet sludge.
Visit our Heinola plant
As regulatory requirements are tightened and the cost of sludge handling increases, a C-Green HTC plant provides an environmentally sound, safe, and practical solution.
Watch the film to hear Stora Enso’s perspective on the collaboration with C-Green – and how our HTC technology could play a role in their strategy to become climate-positive.
Why is sludge hard to handle?
Sludge is dripping wet | With up to 90% water content, sludge is heavy, bulky, and expensive to transport or burn – a major challenge for waste management.
Expensive to dewater | Traditional sludge drying methods consume a lot of energy, making dewatering both expensive and unsustainable.
High pathogen content | Sludge often contains high levels of pathogens, posing a danger to both human health and the surrounding environment.
Foul smell | The ever-present, noxious smell of sludge can be very unpleasant for workers and the surrounding community.
Failure to manage sludge responsibly can result in serious threats to:
Health and the environment | Untreated or poorly managed sludge can release hazardous compounds, contaminating soil and water, and endangering public health and biodiversity.
The climate | Methane and nitrous oxide released from sludge storage and composting have a global warming potential dozens to hundreds of times greater than carbon dioxide.
Turn sludge into climate-smart, sterile and dry HTC biocoal
HTC biocoal is useful
HTC biocoal is a solid, carbon-rich product with many applications: carbon sink, biofuel, fertilizer, or as soil improvement.
Climate-smart
Greenhouse gas emissions from sludge are effectively and immediately eliminated. Sludge is converted into solid biofuel, which can replace fossil fuels.
Increases nutrient recovery
Nitrogen can be recovered in the process and, when HTC biocoal is incinerated, phosphorus can be recovered from the ash.
Saves money
Compared to conventional sludge handling, HTC reduces costs. The process is almost completely self-sufficient making it the most energy-efficient sludge handling method available.
Kills pathogens
Completely destroys all viruses, bacteria, and parasites, producing a sterile and odorless biocoal.
Renewable energy
The conversion of sludge into solid biofuel and biogas offers new sources of sustainable fuel.
