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Sign upNovember 30, 2024
Lemvig Vand
Harboøre
The municipality of Lemvig, covering 516.63 kilometres2 in Denmark, partnered with AquaGreen to install an integrated steam-drying and pyrolysis plant at the Harboore wastewater treatment facility. This plant processes 3,700 tonnes of dewatered sludge annually from Lemvig WWTP and Harbo.re WWTP, reducing carbon emissions, recirculating valuable nutrients, and protecting water bodies from PFAS and other environmental pollutants.
The investment will reduce CO2 emissions by 2,100 tonnes annually, generate 2,000 MWh of sustainable heat, and convert 3,700 tonnes of sludge into 350 tonnes of biochar. Lemvig Vand expects annual savings of €400,000 in sludge disposal costs.
We have a desire to protect the environment and be CO2-neutral by the year 2030, and the new pyrolysis plant gives us an opportunity to do that.
Lars Nørgård Holmegaard, Director at Lemvig Vand
There is a growing concern about what to do with sewage sludge due to concerns of environmentally unfriendly PFAS, 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 pyrolyse (heat to 650 °C) the sludge turning it into useful resources - energy and biochar w. phosphorus - solving environmental and climate problems of sewage sludge. We help the farmer to better yields and the climate by storing CO2 in the ground when biochar is used as a fertilizer. We support future generations' ability to grow plants by recovering phosphorus - an element listed as a critical scarce raw material by the EU.
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