ObjectiveObjective
The recovery of phosphorus (phosphate) from waste materials - especially from municipal waste water and sewage sludge as well as from further applicable secondary raw materials - takes centre stage of the shared funding programme. Because a lot of the considered feed materials contain in addition to phosphorus further plant nutrients as e.g. nitrogen, potassium, magnesium as well as micro nutrients projects are recommended which aim also the recovery of these plant nutrients.
As an example for feed materials, which contain
significant amounts of phosphate and further plant nutrients, shall be
mentioned:
- municipal waste water, sewage sludge and ashes of sewage sludge incineration
- meat and bone meal, meat pulp as well as waste of slaughterhouses
- surplus liquid manure, chicken faeces and dung
- food wastes as well as waste of the food industry
The produced materials for the fertiliser industry have to fulfil the following conditions:
- The contained plant nutrients - especially phosphate - have to be sufficiently soluble to be taken up by the plant roots.
- The amount of pollutants, as e.g. heavy metals and (persistent) organic pollutants, shall definitely fall below the legal requirements for fertilisers and shall, if applied appropriately, not lead to an accumulation of pollutants in the ground.
The produced materials shall be used as fertiliser either alone without any further treatment or as a mixture. On the other hand they shall be suitable for the fertiliser industry as an intermediate product.