Abstract
Municipal solid waste incinerator (MSWI) bottom ash is often used as the protection layer for the geomembrane and intermediate layer in the landfill. In this study, three sets of simulated landfills with different mass proportion of MSWI bottom ash layer to municipal solid waste (MSW) layer were operated. Cu and Zn concentrations in the leachates and MSW were monitored to investigate the effect of MSWI bottom ash layer on the Cu and Zn discharge from the landfill. The results showed that the Zn discharge was dependent on the mass proportion of MSWI bottom ash layer. The pH of landfill was not notably increased when the mass proportion of MSWI bottom ash layer to MSW layer was 1 : 9, resulting in the enhancement of the Zn discharge. However, Zn discharge was mitigated when the mass proportion was 2 : 8, as the pH of landfill was notably promoted. The discharge of Cu was not dependent on the mass proportion, due to the great affinity of Cu to organic matter. Moreover, Cu and Zn contents of the sub-MSW layer increased due to the MSWI bottom ash layer. Therefore, the MSWI bottom ash layer can increase the potential environmental threat of the landfill.
Highlights
Due to the primary advantages of hygienic control, volume reduction, mass reduction, and energy recovery, incineration has become an attractive way for the municipal solid waste (MSW) treatment in China [1]
The result of this study can provide scientific reference for the heavy metal pollution control when the municipal solid waste incinerators (MSWI) bottom ash was used as the protection layer, intermediate layer, and leachate drainage layer in landfill
Each reactor was equipped with five ports: the outlet port at the top lid was used for exporting gas, and the three ports on the side were used for the sampling of the MSWI bottom ash and MSW, while the remaining bottom one was used for leachate drainage and sampling
Summary
Due to the primary advantages of hygienic control, volume reduction, mass reduction, and energy recovery, incineration has become an attractive way for the municipal solid waste (MSW) treatment in China [1]. Cu and Zn are of particular concern as their contents in the MSWI bottom ash and MSW are relatively high [8, 9, 13]. They are reported to have a high toxicity to the surrounding ecosystem [14]. The result of this study can provide scientific reference for the heavy metal pollution control when the MSWI bottom ash was used as the protection layer, intermediate layer, and leachate drainage layer in landfill
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