Recovery and separation of phosphorus as dicalcium phosphate dihydrate
A previous study utilized this approach for incinerated wastewater treatment sludge which is similar to a low grade phosphate ore however their process relied on the high aluminum content of the ash 18 wt% Al 2 O 3 which resulted in phosphorus recovery as aluminum phosphate AlPO 4 which is not a suitable for crop fertilizer or livestock feed additive