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.
Apha, Awwa, Wpcf (1985), Standard Methods for the Examination of Water and Wastewater. 16th Edition. Philadelphia: American Public Health Association.
2.
Berbenni, P. (1986), I test di cessione sui rifiuti speciali, tossici e nocivi. (The migration of toxic and hazardous substances in special wastes.) In Proceedings of September Pollution 86, Padua (Italy), 679-715.
3.
Bourg, A.C.M. (1988), Metals in aquatic and terrestrial systems: sorption, speciation and mobilization. In Chemistry and Biology of Solid Waste (W. Salomon & U. Forstner, eds.), 3-32. Berlin: Springer-Verlag.
4.
Brunner, P.H. & Mönch, H. (1986), The flux of metals through municipal solid waste incinerators, Waste Management & Research, 4, 105-119.
5.
Cernuschi, S., Giugliano, M. & Marforio, R. (1985), Short term environmental behaviour of fly ash and slag from municipal solid waste incineration. In Proceedings of International Recycling Congress and Exhibition, Berlin (Germany), 343-349.
6.
Cnr-Irsa (1985), Metodi Analitici dei Fanghi. (Analytical Methods for Sludges)Rome: IRSA.
7.
Cnr-Irsa (1972-1986), Metodi Analitici per le Acque. (Analytical Methods for Water). Rome: IRSA.
8.
Darcel, F.C. (1983), Column leach testing of solid industrial wastes . In Hazardous and Industrial Solid Waste Testing: 2nd Symposium, ASTM STP ( R. A. Conway & W. P. Culledge, eds.), 805, 127-140.
9.
Francis, C.W. & White, G.H. (1987), Leaching of toxic metals from incinerator ashes . Journal of the Water Pollution Control Federation, 59, 979-986.
10.
Giugliano, M.Cernuschi, S., Bonomo, L. & De Paoli, I. (1988), Leaching evaluation of solid residues from dry and wet dry flue gas treatment in the combustion of coal and municipal solid wastes (MSW). In ISWA '88, Proceedings of the 5th International Solid Waste Conference, Copenhagen (Denmark), 1, 365-370.
11.
Jackson, D.R., Garrett, B.C. & Bishop, T.A. (1984), Comparison of batch and column methods for assessing leachability of hazardous waste. Environmental Science and Technology, 18, 668-673.
12.
Keyser, T.R., Natusch, A.S.F., Liutou, R.W. & Evans, C.A. Jr. (1978), Characterizing the surface of environmental particles. Environmental Science and Technology, 12, 768-773.
13.
Legge 10/5/1976, n. 319, (1976), Norme per la tutela delle acque dall' inquinamento. (Norms for the protection of water from pollution). Gazzetta Ufficiale Vol. 141.
14.
Lowenbach, W. (1977), Evaluation of hazardous solid wastes. In Toxic and Hazardous Waste Disposal ( R. B. Pojasek, ed.), vol. 2, 89-143. Ann Arbor: Ann Arbor Science (U.S.A.), 2, 89-143.
15.
Mezzanotte, V., Sora, S., Vigano, L. & Vismara, R. (1988), Using bioassays to evaluate the toxic and mutagenic properties of landfill leachate. In ISWA '88, Proceedings of the 5th International Solid Wastes Conference, Copenhagen (Denmark), Vol. 1, 131-136.
