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- Phosphorous (1) (entfernen)
Complete survey of German sewage sludge ashes - phosphorous and technology metal recovery potential
(2014)
Sewage sludge ashes (SSA) are a possible source for recovery of phosphorous (P) and technology metals. Phosphorous is essential for all animate beings. So far, its sole external source is rock phosphate, which is a finite resource. The EU import dependency on P from regions with high domestic demands or political instabilities is almost complete. Furthermore, rock phosphate often contains high amounts of heavy metals like Cd and U that might lead to health and environmetal hazards. P recovered from SSA might diminish these problems. We analyzed SSA from German mono incineration facilities in terms of their elemental composition and respective recovery potential. More than 97% of the emerging SSA is monitored, enabling the determination of complete mass flows of the ashes and their components. Results indicate a P recovery potential of 19,000 t/a (more than 12% of the annual P demands for fertilizer production). The concentrations of Cd and U in SSA are significantly lower than in rock phosphate and thus might help to reduce possible envrionmental and health hazards.