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Based in North-East of Germany, HTCycle AG uses biogenic waste as raw material to produce high quality end products, which are like active carbon and can be used for the 4th cleaning step in wastewater treatment plants, as well as ammonium sulphates and struvite for the agricultural sector.

HTCycle AG was established in 2009 and is part of the IPI group (International Power Invest AG), specialised in renewable energy solutions and environmental technologies. The patented HTCycle process is based on hydrothermal carbonisation technology and uses steam as the reaction medium at around 220°C, 24 bars for 3-5 hours. Focusing on sewage sludge with 25-30% water content as raw material, the activated carbon produced from the sewage sludge can be used in the water cleaning process to remove micro plastic, hormones and pharmaceutical residues. Phosphorus can be leached from the HTCycle coal using sulphuric acid, to produce phosphoric acid. Ammonia stripped from offgases can be either reacted with the phosphorus to produce struvite and/or used to produce ammonium sulphate. The process thus complies with the German phosphorus recovery obligation (Sewage Sludge Ordinance of 2017). To date HTCycle AG has more than 10 years of experience operating pilot plants with 8.000 and 16.000 tons of capacity per year and is currently planning to build several full-scale 24/7 operating industrial-plants in Germany together with a European Infrastructure Fund. The first plant will be built in Wolgast, North East Germany, with a capacity of 16.000 tons per year of sewage sludge wet weight. HTCycle AG joins the ESPP because it aims to bring the economic and environmental benefits of hydrothermal carbonization, combined with efficient phosphorus recycling, to the attention of the general and professional public.

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