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A comparison of the extractabilities of Zn, Cu, Ni and Cr from sewage sludges prepared by treating raw sewage with the metal salts before or after anaerobic digestion

1982; Elsevier BV; Volume: 3; Issue: 3 Linguagem: Inglês

10.1016/0143-148x(82)90060-x

1878-0695

C. Bloomfield, S. P. McGrath,

Heavy metals in environment

Relatively uncontaminated raw sewage was digested anaerobically in the presence and absence of salts of Zn, Cu, Ni or Cr. The availabilities of the metals, as determined by extraction with NH4OAc, acetic acid or EDTA, were considerably less in sludge formed by digestion in the presence of the metals than in sludge obtained by treatment with the salts subsequent to the digestion process.