PHOSPHATE RECOVERY FROM SEWAGE SLUDGE SUPERNATANTUSING MAGNETIC NANOPARTICLESPhosphorus is one of the most essential nutrients; it is used in the manufacture of fertilizers, detergents, and polishers. Environmental pollution due excessive nutrient discharges is the most important issue in wastewater treatment. Nutrients have many adverse effects on surface water resources, groundwater and soil. Despite the extensive uses of phosphorus in different sectors, phosphorus is a non-renewable and noninterchangeable limited resource. Consequently, the recovery of phosphate should be considered as well as the removal.This study was carried out to investigate the efficiency of employing magnetic nanoparticles (MNPs) in phosphorus removal from sewage sludge supernatant. In the scope of the study, batch experiments were performed to investigate the effect of different parameters on phosphate adsorption using iron oxide magnetic nanoparticles.The iron oxide MNP was prepared with co-precipitation method. MNP characterization was done with X-ray diffraction, Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy measurements. These experiments proved the effective phosphate adsorption by iron oxide MNP. The presence adsorbed of the phosphorus on the surface of magnetic nanoparticles was confirmed using energy-dispersive x-ray spectroscopy. Zeta potential measurements were conducted to determine the surface charge of the particles at different pH values. Equilibrium studies showed that the synthetic P solution and supernatant solution was consistent with the Redlich-Peterson isotherm model. The theoretical maximum adsorption capacity of iron oxide MNP calculated using Sips model is 20.8 mg/g. The kinetics studies of the synthetic phosphate solution and supernatant solution was consistent with the Elovich model. The highest adsorption capacity was measured with 1000 mg/L P solution and 0.3 g magnetic nanoparticles. Desorption of phosphorus from the iron oxide MNP surface was effectively done by treating the MNPs with 1 M NaOH solution vi for 1 hour.The aim of this study to evaluate the MNP for the adsorption of phosphate. We would like to find a more accurate usage for nanoparticles, moreover to examine a cheaper, more available method for phosphate recovery.