Water Treatment Residuals and Scrap Tire Rubber as Green Sorbents...: Ingenta Connect

ABSTRACT:

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.

 

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Taxonomy

• Heavy Metal Removal
• Environment
• Pollution
• Stormwater
• Stormwater Runoff

1 Comment

1. Thanks Naizam for sharing this article,

   Using scrap tire rubber for the above adsorption of selected metals could make sense at first reading.

   However, such scrap tire rubber could also be devulcanized to produce new tires by re-vulcanizing it again and again, thus closing the loop of the recycling of tires.

   N.B The fate of end of life tires today is very pathetic as you know: 40% gets burnt in cement kilns (as free or almost free fuel), 40% gets cut in pieces for insulation and shock absorption purpose, 10% is landfilled, and 10% is retreaded.