aqua-regia and ammonium-citrate

The importance of secondary raw materials for phosphorus (P) fertilizer production is expected to increase in the future due to resource depletion, supply risks, and heavy metal contamination of fossil phosphate resources. Municipal wastewater is a promising source for P recovery. In Germany for instance, it contains almost 50% of the total amount of P that is currently applied as mineral fertilizer. Several procedures have been developed to recover and re-use P resulting in a growing number of recycling fertilizers that are currently not regulated in terms of fertilizer efficiency. We tested various materials and matrices for their total P content, solubility of P in neutral ammonium citrate (P

Topics: Citric Acid; Fertilizers; Hydrochloric Acid; Hydrofluoric Acid; Incineration; Industrial Waste; Nitric Acid; Perchlorates; Phosphates; Phosphorus; Quaternary Ammonium Compounds; Recycling; Sewage; Sodium Hydroxide; Temperature