Characteristics and mobility of heavy metals in an MSW landfill: implications in risk assessment and reclamation.

To assess the reclamation feasibility of a landfill, the characteristics, distribution, and mobility of heavy metals in the landfill were investigated. The refuse was characterized as containing high concentrations of heavy metals, a relatively high pH, and a high ratio of NH(4)-N to total nitrogen (TN). The results of heavy metal distribution showed that relatively high levels of heavy metals were accumulated in the landfill. Sequential extraction revealed that the relative amounts of heavy metals were different in the samples. Zn demonstrated the greatest mobility compared to other heavy metals, whereas Cd was well retained in the landfill. Leaching experiments indicated that the mobility of heavy metals in the landfill was generally low under normal neutral conditions. However, release of heavy metals can be increased greatly when medium conditions become more acidic and aerobic.

[1]  Elin Gjengedal,et al.  Estimation of the mass-balance of selected metals in four sanitary landfills in Western Norway, with emphasis on the heavy metal content of the deposited waste and the leachate. , 2004, Water research.

[2]  J. Fergusson,et al.  Effectiveness of a commonly used sequential extraction technique in determining the speciation of cadmium in soils , 1991 .

[3]  P. Flyhammar.  Use of sequential extraction on anaerobically degraded municipal solid waste , 1998 .

[4]  Pradeep Jain,et al.  Heavy metal content in soil reclaimed from a municipal solid waste landfill. , 2005, Waste management.

[5]  A. Tessier,et al.  Sequential extraction procedure for the speciation of particulate trace metals , 1979 .

[6]  I Neretnieks,et al.  Long-term processes in waste deposits. , 2000, The Science of the total environment.

[7]  B. Guy,et al.  Soil characteristics, heavy metal availability and vegetation recovery at a former metallurgical landfill: Implications in risk assessment and site restoration. , 2005, Environmental pollution.

[8]  A. Mårtensson,et al.  Metal and organic matter contents in a combined household and industrial landfill. , 2006, Waste management.

[9]  E. Marguí,et al.  Comparison of three-stage sequential extraction and toxicity characteristic leaching tests to evaluate metal mobility in mining wastes , 2004 .

[10]  U. Förstner,et al.  Chemical extraction of heavy metals in polluted river sediments in Central Europe , 1983 .

[11]  S. Al-Abed,et al.  Comparative evaluation of short-term leach tests for heavy metal release from mineral processing waste. , 2006, The Science of the total environment.

[12]  A. Elias,et al.  Assessment of metal extraction, distribution and contamination in surface soils by a 3-step sequential extraction procedure , 1999 .

[13]  I Neretnieks,et al.  Long-term fate of organics in waste deposits and its effect on metal release. , 1999, The Science of the total environment.

[14]  Z. Youcai,et al.  A comparison of refuse attenuation in laboratory and field scale lysimeters. , 2002, Waste management.

[15]  Thomas H. Christensen,et al.  Heavy metal content of combustible municipal solid waste in Denmark , 2005, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[16]  P. Flyhammar,et al.  Estimation of heavy metal transformations in municipal solid waste. , 1997, The Science of the total environment.