Ion exchange removal of Cu(II), Fe(II), Pb(II) and Zn(II) from acid extracted sewage sludge – Resin screening in weak acid media. (1st July 2019)

• Record Type: Journal Article
• Authors: Bezzina, James P.; Ruder, Laura R.; Dawson, Robert; Ogden, Mark D.
• Is Part Of: Water research. Volume 158(2019)
• Page Start: 257
• Page End: 267
• Publication Date: 2019-07-01
• Subjects: Transition metals -- Weak acid -- Ion exchange resin -- Remediation -- Extraction; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2019.04.042
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: A shortage of phosphate rock resources has led to a focus on the use of sewage sludge as a fertiliser. One factor preventing the unlimited application of sewage sludge in agriculture is the heavy metal content. This work looks at a process where weak acid leaching of sewage sludge would be coupled to ion exchange (IX) for heavy metal ion removal. IX offers an effective method for the recovery of these metals from a leachate. This study presents the pH performance of six selected IX resins in extracting Cu 2+, Fe 2+, Pb 2+ and Zn 2+ from acetic, lactic and citric acid media simulated weak acid leachate. Acetic acid media displayed limited suppression of metal extraction, whilst lactic and citric acid media rendered MTS9100 ineffective. Lactic acid media when combined with C107E resin allows for the targeted extraction of lead. Both MTS9570 and MTS9501 display high ferrous extraction in all media at all pH values, although citric acid hinders extraction by both resins at higher pH values. TP214 is selective for copper over all other metal ions in all weak acid media. MTS9301 is the most effective at extracting all metals from all media solutions, with separation of copper becoming more apparent when transitioning to citric acid. Graphical abstract: Image 1 Highlights: MTS9301 is effective at extracting selected metal ions from all tested media. Citrate media is effective at hindrance of metal adsorption. TP214 can selectively extract copper from high complexing solutions. C107E can selectively extract lead from lactate media.