Abstract
The conducted studies confirm the possibility and expediency of using the reagent method to remove ammonium nitrogen from wastewater in the form of slightly soluble magnesium-ammonium orthophosphate MgNH4PO4 · 5H2O, which is a high-quality fertilizer. The most optimal conditions for the process of reagent precipitation of ammonium nitrogen at an initial concentration of NH4+ - N – 470 mg / l are pH 8.5 and the stoichiometric ratio Mg2+: NH4+: PO43- = 1,5: 1: 1,5. It was determined that according to the chemical composition, properties and behavior during heating of the obtained magnesium-ammonium phosphate crystallohydrate corresponds to the biogenic mineral struvite and can be used as a mineral fertilizer of prolonged action. It was found that the method of preserving struvite does not significantly affect the germination of the disease and the value of the humidity of germination.
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