Removal of toxic metals from sewage sludge by EDTA and hydrodynamic cavitation and use of the sludge as fertilizer

Arteaga, Juan Francisco Morales; Vodnik, Dominik; Kastelec, Damijana; Zupanc, Mojca; Dular, Matevž; Ortar, Jernej; Đurić, Marija; Kaurin, Anela; Mihelic, Rok; Lestan, Domen

doi:10.1016/j.scitotenv.2024.171444

Cited by 1 publication

(1 citation statement)

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“…The obtained digestion solution was then analyzed by the ICP-OES. [28,29] The total organic carbon (TOC) concentrations of sampled reaction solutions were analyzed by a TOC analyzer (TOCÀ L, Shimadzu, Japan). Free radicals were qualitatively detected by an electron paramagnetic resonance (EPR) spectrometer (A300, Bruker, USA).…”

Section: Methodsmentioning

confidence: 99%

Peroxydisulfate‐based Non‐radical Oxidation of Rhodamine B by Fe‐Mn Doped Granular Activated Carbon: Kinetics and Mechanism Study

Wu,

Yang,

et al. 2024

Chemistry An Asian Journal

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The present study focused on a green and readily synthesized Fe‐Mn bimetallic oxide doped GAC (Fe‐Mn@GAC), to uncover its catalytic kinetics and mechanism when used in the peroxydisulfate (PDS)‐based oxidation process for degrading Rhodamine B (RhB), a representative xenobiotic dye. The synthesized Fe‐Mn@GAC was characterized by SEM‐EDS, XRD, ICP‐OES and XPS analyses to confirm its physicochemical properties. The catalytic kinetics of Fe‐Mn@GAC + PDS system were evaluated under varying conditions, including PDS and catalyst dosages, solution pH, and the presence of anions. It was found Fe‐Mn@GAC exhibited robust catalytic performance, being insensitive to a wide pH range from 3 to 11, and the presence of anions such as Cl‐, SO42‐, NO3‐ and CO32‐. The catalytic mechanism was investigated by EPR and quenching experiments. The results indicated the catalytic system processed a non‐radical oxidation pathway, dominated by direct electron transfer between RhB and Fe‐Mn@GAC, with singlet oxygen (1O2) playing a secondary role. The catalytic system also managed to maintain a RhB removal above 81% in successive 10 cycles, and recover to 89.5% after simple DI water rinse, showing great reusability. The catalytic system was further challenged by real dye‐containing wastewater, achieving a decolorization rate of 84.5%.

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Section: Methodsmentioning

confidence: 99%