Phosphate recovery from sewage sludge supernatants using magnetic nanoparticles

Abstract

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.

White Cement as a Nontoxic and Eco-Friendly Adsorbent for Phosphate Adsorption/Desorption: Characterization, Optimization, and Modeling Studies

“…In addition, the attraction of opposite electrical charges between phosphate anions and the adsorbent enhanced the adsorption capacity. After this process, the increase in the final pH value of the solutions (11.69) could be related to the ligand exchange reaction, indicating the chemisorption mechanism, as reported by Gulýas et al (2021) …”

“…Parameters Obtained by Yoon−Nelson and Thomas Models . After this process, the increase in the final pH value of the solutions (11.69) could be related to the ligand exchange reaction, indicating the chemisorption mechanism, as reported byGulyás et al (2021) 108. At pHs ranging from 5.00 to 10.00, the predominant KH 2 PO 4 species are H 2 PO 4 − at pH 5.0 to 7.0 and HPO 4 − at pH 7.0 to 10.0 3.…”

Green chemistry: advancing planetary phosphorus sustainability through the synergy of graphene oxide modified with magnetic nanoparticles (M@GO) for extracting tertiary effluent phosphorus in sewage treatment plants

“…16,17 Recently, the development and application of nanoscale adsorbents have emerged as a promising methodology for remediating a diverse range of contaminants from wastewater. [18][19][20][21] Among available sorbents graphene oxide (GO) stands out. This sorbent has a large surface area with a high density of polar oxygen, presenting different functional groups such as epoxy, carboxylic acid, carbonyl and hydroxyl groups.…”

Recovery of phosphorus as soluble phosphates from aqueous solutions using chitosan hydrogel sorbents

“…The growing industry’s demand for phosphorus compounds accelerates the exploitation of its depleting deposits. With the current phosphorus deposits exploitation rate, they are estimated that economically feasible phosphate rock will be exhausted within 100–400 years 2 , 3 . The deficit of this raw material will firstly affect European Union Member States whose natural phosphorus resources are scarce or of no economic importance 4 .…”