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Water Treatment Residuals and Scrap Tire Rubber as Green Sorbents for Removal of Stormwater Metals
Author(s) -
Deng Yang,
Morris Ciapha,
Rakshit Sudipta,
Landa Edward,
Punamiya Pravin,
Sarkar Dibyendu
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143016x14504669768697
Subject(s) - stormwater , scrap , adsorption , leaching (pedology) , natural rubber , environmental chemistry , waste management , environmental science , environmental engineering , chemistry , surface runoff , ecology , organic chemistry , soil water , soil science , engineering , biology
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 NaNO 3 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.