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Published in last 50 years
Solubilization of Solid Waste Discharged from Freshwater Recirculating Fish Culture System by Chemical Digestion for Production of Liquid Fertilizer
Reaction of urea with citric acid in aqueous solutions at molar ratios of 1 : 1, 1 : 2, and 2 : 1 and the solubility of urea citrate were studied. The data obtained can serve to optimize use of citric acid as a physiologically active substance or nitrification inhibitor and in production of liquid fertilizers containing urea.
Solubility in the system Ca(NO3)2-Mg(NO3)2-NH4NO3-H2O was studied by the visual-polythermic method. The crystallization curves and the chemical composition of the solid phase were determined. The chemical composition of solutions with crystallization temperature of 0°C was calculated. A technological scheme for production of liquid fertilizers containing nitrogen, calcium, and magnesium was proposed.