In the near future Europe`s underground construction industry is expected to excavate around 800 million tons of mineral resources from tunnels, metros and other underground constructions like underground powerhouses, sewage tunnels etc. Currently, this excavation material is usually disposed of in landfills. Efficient use and recycling on site or in other industrial sectors is therefore of great economic and environmental interest. This approach would substitute a large amount of primary mineral resources and substantially reduce environmental problems and CO2 emissions involved in landfilling and transport.

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Natural phosphate sources low in heavy metals are getting scarce. Containing about 15 mass-% of P2O5, sewage sludge ash can be considered as secondary phosphorus (P-) source. The P-content in the European sewage sludge could replace roughly 15% of the phosphate imports into the EU. The RecoPhos project will use an innovative reactor in order to recover phosphorus from sewage, sludge and ashes. The reactor was originally designed for the reductive recovery of steel work dusts. By the use of ashes the material flow will be minimal; if only sludge is available, it can be also used as input, adding flexibility to the concept. If additives are needed, suitable industrial wastes can be used.

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