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Liquefaction residues (LR) are the main by-products of sewage sludge (SS) liquefaction. This study quantitatively evaluates the potential ecological risk and pollution degrees of heavy metals (Pb, Zn, Cu, Cd, Cr and Ni) in LR versus SS. The leaching rates (R 1 ) of heavy metals in LR were much lower than those in SS, revealing that the mobility/leachability of heavy metals was well suppressed...
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