Removal of toxic metals using a novel PHA resin-fixed bed column performance study
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Removal of toxic metals using a novel PHA resin-fixed bed column performance study Mousumi Singha1 · Sangita Pal2 Received: 18 June 2020 / Accepted: 19 September 2020 / Published online: 10 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The performance and efficiency of a fixed bed column loaded with a three-dimensionally crosslinked polyhydroxamic acid resin is studied with glass column. Experiments were carried out with synthetic metal solutions containing Cu(II), Sr(II), Gd(III) individually and with mixed solution containing Cu(II), Sr(II), Gd(III) and U(VI) to establish the efficiency of the fixed bed resin for a mixed solution. The “S” shaped break through curve was generated and percentage saturation of the bed was estimated. The percentage saturation at 10% breakthrough volume was found to be 68.3% for Cu(II) and Sr(II) 71.3% and 65.6% for Gd(III). Keywords Fixed bed column · Breakthrough plots · Sorption · Resin · Column efficiency
Introduction Nuclear energy has emerged as a clean source [1] and the growth of nuclear science and technology has been significant. The growth of nuclear industry generated waste streams originating from mining, milling, fuel fabrication, operation of reactors to reprocessing of spent fuels [2, 3]. These operations generate the major source of aqueous waste which contains toxic heavy metals. These contaminations are harmful if disposed untreated. Additionally, some of the metals have economic value and their recovery may be essential. From mining to milling and then reactor operation followed by reprocessing generates aqueous waste which contains a spectrum of metals. In the present study, representative metals were chosen from the periodic table to study the possibility of using the inhouse resin in removing metal ions from aqueous waste solution. Representing Cu(II) as transition metal, Gd(III) as rare earth metal, Sr(II) as alkaline earth metal and U (VI) as an actinide were chosen for the study. These metals are frequently found in aqueous nuclear wastes [4–11]. * Mousumi Singha [email protected]; [email protected] 1
Uranium Extraction Division, BARC, Homi Bhabha National Institute, Mumbai, India
Desalination Division, Bhabha Atomic Research Centre, HBNI, Mumbai 400094, India
2
Various treatment methods can be deployed for the treatment of toxic metals which includes precipitation, adsorption, ion exchange, reverse osmosis to name a few. They have disadvantages of consumption of other chemicals, further operational procedures, high cost etc. [12, 13]. Solid phase sorption using functionalised polymers preferably embedded in macromolecular chain is selective and less energy intensive. As the process is reversible regeneration of resin and recovery of metals is an added advantage. [14, 15]. Sorption isotherms and kinetic study using batch method for metal ions Cu(II), Sr(II), Gd(III), U(VI) onto inhouse resin polyhydroxamic acid (PHA) resin has been studied and sorption isotherm and kinetics were modelled based on available models [16]. P
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