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Combined steam drying and pyrolysis unit

Handling wastewater sludge for heating and biocharging

March 2021
Gallery Combined steam drying and pyrolysis unit 1
Gallery Combined steam drying and pyrolysis unit 1
01.

Identification

There is a growing concern about what to do with sewage sludge due to concerns of environmentally unfriendly pharmaceuticals, microplastic and chemical compounds (PAHs, furans, dioxins, NPE, LAS etc). In many countries, sludge is now incinerated instead of spread on land due to public health concerns. This creates a problem of locking Phosphorus in the ash making it very difficult and expensive to recycle it into the soil. Sludge can only be spread on land 3 months a year and the prolonged storage gives considerable GHG emission. AquaGreen dries and pyrolyses (heat to 650 °C) the sludge turning it into useful resources - energy and biochar w. phosphorus - solving environmental and climate problems of sewage sludge. It the farmer to better yields and the climate by storing CO2 in the ground when biochar is used as a fertilizer. It also supports future generations ability to grow plants by recovering phosphorus - an element which is listed as a critical scarce raw material by EU.

Label Date March 2021
From Denmark
Maturity stage Prototype testing in the real world
Looking For New clients

Sectors - Value chain - Application

Sectors
Applications
Design, Power & Produce
Package & Distribute
Use & Efficiency
Valorize & Restore
Value Chain Steps
  • /
02.

The environmental benefits

  • One 350 kW unit capture and store 550.000 kg CO2-eq per year in the biochar treating the sludge from a city with 40.000 people
  • Recycle 80 % of the phosphorus in the sewage sludge
  • Biochar is recognised by UN IPCC in 2019 as one of three ways to capture and store carbon to avoid climate change
  • Sewage sludge volume reduced with 90 % and pyrolised sludge (biochar) is sterilised and decontaminated and odor free
  • Carbon storage via the biochar - 50 % of the carbon in the sewage sludge is captured in the biochar saving 1.1 kg CO2 eq per kg of biochar.
  • The phosphorous of the biochar is plant available to a very large degree whereas today's standard sludge incineration process is very problematic for phosphorus' plant availability
03.

The Financial benefits

  • ROI for the waste water plant after 2-6 years - due to sludge handling/incineration cost savings
  • Avoiding cost of extracting phosphorus from the sludge after incineration - currently estimated in Germany to 300 €/ton (per ton sludge on dry matter basis)
04.

Activity Region

  • /
  • Headquarters
  • Activity
05.

Company Profile

AquaGreen

AquaGreen is a CleanTech company with unique patented technology upcycling dry and wet biomass to resources.

View company profile Solution website
Headquarters 4000 Roskilde, Danmark
06.

Networking Partner

Cleantech Scandinavia

Network of industrial companies, investors, real estate companies and cities; connecting to 1 400+ clean technology companies from the Nordics and Baltics.

View partner profile
Solutions Associated 16
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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances.