Ash2®Phos: Closing the Phosphorus cycle - Clean Calciumphosphate from incinerated sewage sludge

Ash2®Phos: Closing the Phosphorus cycle - Clean Calciumphosphate from incinerated sewage sludge

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Description

The EU’s fertilizer and feed industries are highly reliant on imports of phosphate rock. Meanwhile, municipal wastewater contains large quantities of P, that can increase Europe´s self-sufficiency. EasyMining has developed a process for the recovery of clean phosphate from sewage sludge ash (SSA) which is patented and registered under the brand Ash2Phos. This process is based on chemical treatment of sewage sludge ash from mono-incineration or similar wastes. P is recovered in the form of clean precipitated calcium phosphate (RevoCaP). The RevoCaP is of high purity thanks to the detoxification step in the process (low amounts of unwanted substance, Cd <0.1 mg/kg RevoCaP, F 0.014 mg/kg RevoCaP and no organic contaminants or pathogens). The product contains about 17% P and has a low solubility in water. It is fully soluble in citric acid and about 80% soluble in neutral ammonium citrate, fulfilling the requirements of the EU Fertilizing Product Regulation (FPR, Regulation (EU 2019/1009). Results from ryegrass tests show that the RevoCaP works efficiently as a slow-release fertilizer in acid soils. The applications of RevoCaP range from apatite replacement for high quality fertilizers to direct application as slow release fertilizer and even usage as feed phosphate due to its high purity. In a Joint Venture with Gelsenwasser, EasyMining will start production of 15 000 t/a of RevoCaP from 2026 end expand its production to 150 000 t/a by 2032. Additionally, EasyMining is also active in the recovery of clean Ammonium Sulfate and Potassium from wastewater and household waste.

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