Extractabilities of heavy metals in chemically-fixed sewage sludges

摘要

Chemically-fixed sewage sludges, including lime-treated sludge (LS), lime-sodium silicate- treated sludge (LSS), cement-treated sludge (CS), and cement-sodium silicate-treated sludge (CSS), were produced from sewage sludge by bench processes suing lime, cement, and sodium silicate as additives. The extractabilities of heavy metals (Cu, Pb, cr, and Zn) in these chemically-fixed sludges were studied using sequential extraction and single extraction.