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This paper studies the removal efficiency of six heavy metals (Zn, Ni, Cr, Pb, Cu, and Cd) from anaerobically digested biosolids by chemical extraction, as a necessary step for reducing the adverse effects of land application of biosolids. To assess the heavy metal extraction, two organic acids (citric and oxalic), two inorganic acids (nitric and hydrochloric) and one strong chelator (EDTA) were tested...
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