Removal of heavy metals from industrial waste solutions by a rotating fixed bed of ion exchange resin

2017 ◽  
Vol 100 ◽  
pp. 178-184 ◽  
Author(s):  
M.A. Hagag ◽  
D.A. El-Gayar ◽  
S.A. Nosier ◽  
A.A. Mubark
Keyword(s):  
Heavy Metals ◽  
Ion Exchange ◽  
Industrial Waste ◽  
Exchange Resin ◽  
Fixed Bed ◽  
Ion Exchange Resin ◽  
Removal Of Heavy Metals

scholarly journals Rapid Preparation of Biosorbents with High Ion Exchange Capacity from Rice Straw and Bagasse for Removal of Heavy Metals

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Supitcha Rungrodnimitchai
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Ion Exchange ◽  
Rice Straw ◽  
Heavy Metal Ions ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Removal Of Heavy Metals

This work describes the preparation of the cellulose phosphate with high ion exchange capacity from rice straw and bagasse for removal of heavy metals. In this study, rice straw and bagasse were modified by the reaction with phosphoric acid in the presence of urea. The introduced phosphoric group is an ion exchangeable site for heavy metal ions. The reaction by microwave heating yielded modified rice straw and modified bagasse with greater ion exchange capacities (∼3.62 meq/g) and shorter reaction time (1.5–5.0 min) than the phosphorylation by oil bath heating. Adsorption experiments towards Pb2+, Cd2+, and Cr3+ions of the modified rice straw and the modified bagasse were performed at room temperature (heavy metal concentration 40 ppm, adsorbent 2.0 g/L). The kinetics of adsorption agreed with the pseudo-second-order model. It was shown that the modified rice straw and the modified bagasse could adsorb heavy metal ions faster than the commercial ion exchange resin (Dowax). As a result of Pb2+sorption test, the modified rice straw (RH-NaOH 450W) removed Pb2+much faster in the initial step and reached 92% removal after 20 min, while Dowax (commercial ion exchange resin) took 90 min for the same removal efficiency.

scholarly journals Development of a Combined Leaching and Ion-Exchange System for Valorisation of Spent Potlining Waste

2020 ◽  
Vol 11 (10) ◽  
pp. 5467-5481 ◽  
Author(s):  
Thomas J. Robshaw ◽  
Keith Bonser ◽  
Glyn Coxhill ◽  
Robert Dawson ◽  
Mark D. Ogden
Keyword(s):  
Ion Exchange ◽  
Solid Waste ◽  
Exchange Resin ◽  
Waste Product ◽  
Fixed Bed ◽  
Ion Exchange Resin ◽  
Exchange System ◽  
Fixed Bed Column ◽  
Chemical Leaching ◽  
Global Challenge

Abstract This work aims to contribute to addressing the global challenge of recycling and valorising spent potlining; a hazardous solid waste product of the aluminium smelting industry. This has been achieved using a simple two-step chemical leaching treatment of the waste, using dilute lixiviants, namely NaOH, H2O2 and H2SO4, and at ambient temperature. The potlining and resulting leachate were characterised by spectroscopy and microscopy to determine the success of the treatment, as well as the morphology and mineralogy of the solid waste. This confirmed that the potlining samples were a mixture of contaminated graphite and refractory materials, with high variability of composition. A large quantity of fluoride was solublised by the leaching process, as well as numerous metals, some of them toxic. The acidic and caustic leachates were combined and the aluminium and fluoride components were selectively extracted, using a modified ion-exchange resin, in fixed-bed column experiments. The resin performed above expectations, based on previous studies, which used a simulant feed, extracting fluoride efficiently from leachates of significantly different compositions. Finally, the fluoride and aluminium were coeluted from the column, using NaOH as the eluent, creating an enriched aqueous stream, relatively free from contaminants, from which recovery of synthetic cryolite can be attempted. Overall, the study accomplished several steps in the development of a fully-realised spent potlining treatment system. Graphic Abstract

Chelating Resin versus Ion-Exchange Resin for Heavy Metal Removal in Toxicity Fractionation

1992 ◽  
Vol 26 (1-2) ◽  
pp. 189-196 ◽  
Author(s):  
C. N. Mazidji ◽  
B. Koopman ◽  
G. Bitton
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Complete Removal ◽  
Ion Exchange Resin ◽  
Chelating Resin ◽  
Heavy Metal Cations ◽  
Removal Of Heavy Metals

A chelating resin (Chelex 50-100) and ion-exchange resin (Dowex 50W-X8) were evaluated for removal of heavy metals in toxicity fractionation. Microtox and β-galactosidase activity were employed as toxicity endpoints. The resins were packed into 4 raL glass Pasteur pipettes for use. Chelating resin provided complete removal of toxicity due to polyvalent heavy metal cations (Cd, Cu, Hg, Pb, Zn). Ion-exchange resin was ineffective in removing mercury toxicity. Neither resin provided complete removal of Ag+ toxicity. Toxicity of organic compounds was, at most, partially removed. Performance of the ion-exchange and chelating resins was insensitive to hardness and pH. Based on these results, chelating resin is recommended for heavy metal removal as part of a toxicity fractionation procedure.

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