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Analysis of the breakthrough phenomena during heavy metal elution from a column packed with municipal waste incineration ash

Zhang W., Yang Y., Suganuma H., Kato S., Suzuki S., Kojima T.

Environment Protection Engineering

2018

Vol. 44, nr 3

63--78

At some point during acid leaching column tests of heavy metals from municipal waste incineration ash, sudden and rapid elution of harmful elements was observed which was called the breakthrough (BT) phenomena. The mechanism was elucidated from the results of measurement of elemental and particle size distribution in the column and batch leaching tests as follows. At the first stage of experimental runs, CaCO3 was dissolved in acidic solution and pH profile along the bed is formed. Some of the minor elements of Zn and Al dissolved by acid at the upper part of the column are precipitated at bottom of the column, leading to the reduction of flow rate of the leachate solution. After leachate pH becomes low by the termination of dissolution of Ca, these deposits are dissolved and thus, the flow rate increases. Most of the trace elements behave as such, which causes the increase of harmful element concentrations in the eluate. Some drastic concentration increase of harmful elements in leachate may occur even after the long period of pseudo stable dissolution behavior in the land-fill site.

The Decopperization and Coagulation by Use the Carbon-N-Ox Method

Bydałek A., Migas P., Wołczyński W., Karwan-Baczewska J.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 4

2375--2380

This paper discusses the impact of complex chemical reagents during the process of decopperisation of slag. The beneficial effect of carbide response factors with the participation of nitrogen was indicated as well as the role of stimulators surfactants. Based on the results of the research the basic structure of the slag during decopperisation was systematized. The effects of coagulation of droplets of copper in the slag were shown in this paper.