Abstract
To investigate the heavy metal pollution in leachate from sanitary landfill site of municipal solid waste, a survey was conducted in Tromsø, Northern Norway. Results shows that contents of heavy metals in landfill leachate follow the order Mn>Zn>Ni>Cu>Cr>As>Pb>Cd>Hg, and the order of the risk of different heavy metals is: Mn>Ni>As>Zn>Cr>Pb>Cd>Hg>Cu. The concentrations of Mn and Ni in landfill leachate exceeded the standard. Mn had the highest single standard index. it took the highest risk to surround water and environment. According to comprehensive evaluation of water quality, the landfill leachate is moderately polluted. It is helpful for the control and management of leachate in garbage plants to know the degree and types of heavy metal pollution in leachate.
Highlights
With the rapid development of urban area and increase of urban population, the urban domestic garbage increased significantly throughout the years
The variations of landfill leachate water quality is affected by the composition of garbage, water content of garbage, temperature of garbage, landfill time, landfill technology, rainfall infiltration and so on, among which the most important factor is the impact of rainfall and landfill time [7]
Heavy metals content in the municipal refuse leachate According to sampling analysis, the results of heavy metal content in landfill leachate are shown in table 1
Summary
With the rapid development of urban area and increase of urban population, the urban domestic garbage increased significantly throughout the years. Landfill leachate mainly contain three aspects: (1) natural rainfall and runoff in the landfill; (2) the original water content of the garbage itself; and (3) water produced by anaerobic decomposition of microorganisms after the sanitary landfill [6]. When the water seeps through the complicated garbage, the waste will be decomposed, dissolved, fermented, etc., the leachate contains a large amount of organic pollutants, nitrogen, phosphorus and heavy metal metals [4]. The variations of landfill leachate water quality is affected by the composition of garbage, water content of garbage, temperature of garbage, landfill time, landfill technology, rainfall infiltration and so on, among which the most important factor is the impact of rainfall and landfill time [7].
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