Water treatment residuals and scrap tire rubber as green sorbents for removal of stormwater metals

Yang Deng, Ciapha Morris, Sudipta Rakshit, Edward Landa, Pravin Punamiya, Dibyendu Sarkar

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Bench scale tests were performed to evaluate two recycled wastes, water treatment residuals (WTR) and scrap tire rubber (STR), for adsorption of selected metals from urban stormwater, and assess their release from used sorbents. Aluminum-WTR alone could rapidly and effectively remove Cu, Pb, and Zn, while STR alone continuously released Zn accompanied with Cu and Pb adsorption. Zn leaching from STR was significantly reduced in the presence of WTR. Very little metals released from used combined adsorbents in NaNO3 solution, and only part of them were extracted with EDTA (a strong chelating agent), suggesting that metal release is not a concern in a typical stormwater condition. A combination of WTR and STR is a new, effective method for mitigation of urban stormwater metals-WTR can inhibit the STR leaching, and STR improves the hydraulic permeability of WTR powders, a limiting factor for stormwater flow when WTR is used alone.

Original languageEnglish
Pages (from-to)500-509
Number of pages10
JournalWater Environment Research
Issue number6
Publication statusPublished - Jun 2016



  • Adsorption
  • Copper
  • Heavy metals
  • Lead
  • Scrap tire rubbers
  • Urban stormwater runoff
  • Water treatment residuals
  • Zinc

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