Abstract
ABSTRACT
Landfill codisposal of industrial waste (IW) and municipal solid waste (MSW) was conducted in test columns. The IW studied in this work was a steel flue dust from an Ontario steel manufacturer and was classified as a hazardous material. There were 7 columns used in this study. Three of them were packed with 100%MSW while other four were packed with MSW + 8%IW. One 100%MSW and two MSW + 8%IW columns were closed and received controlled water additions, while other four columns were open and received water input from precipitation.
The column study was carried out over a relatively long term in order to investigate the consequences corresponding to codisposal of IW in a municipal solid waste landfill. The results obtained over an operational period of 2300 days are reported. The presence of the steel flue dust layered between MSW accelerated the stabilization of the waste which was shown by a more rapid decrease in COD and neutralization of leachate from the columns containing MSW + IW compared to the columns containing MSW only. At the same time no significant increase in release of ions such as Ca, Mg and heavy metals into leachate was observed when compared to disposal of MSW alone. Elements having very soluble salts showed an increase in the release of ions corresponding with an elevated level of the elements in the industrial waste.
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