Leaching of Residues From Msw Incineration

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Abstract
Laboratory batch and column leaching tests of fly ash from MSW incineration have shown that heavy metals in fly ashes collected in dry or spray dry acid removal systems using lime are much more soluble than the same metals in fly ash collected without added lime. Much of the increase in solubility can be ascribed to the presence of chlorides. In particular nearly all of the lead, cadmium, copper and zinc is released at pH 5 in acetic acid from acid gas cleaning residues while only about a third is released from fly ash alone. Substantial fractions of lead are released even at high pHs from acid gas cleaning residues.

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