Advertisement

Geotechnical Issues for Developing Coastal Waste Landfills

  • Toru Inui
  • Takeshi Katsumi
Chapter
Part of the International Perspectives in Geography book series (IPG)

Abstract

Coastal landfilling has become one of the most important practices in the disposal of municipal solid waste incinerator ash (MSWIA) as well as industrial waste generated in megacities in Japan. Leachate generated from these waste materials may contain substances, particularly heavy metals, that are harmful to the environment. Mechanical properties of coastal waste landfills have not been comprehensively studied. Considering the post-closure use of landfill sites, both mechanical properties and long-term mobility of heavy metals are important geotechnical issues. This article addresses the results of large-scale column percolation and modified batch tests conducted to evaluate the mobility of heavy metals in coastal MSWIA landfills, based on heavy metal speciation using a sequential extraction method. The column percolation test was conducted to simulate the behavior of zinc (Zn), as a trace metal, in the waste-bottom marine clay system. Modified batch tests were employed to investigate the effects of pH and Eh on the forms of Zn in both MSWIA-leachate and leachate-marine clay systems. Zn was effectively immobilized by forming exchangeable and reducible fractions under moderately alkaline conditions or reducible and oxidizable fractions under highly alkaline conditions. However, Zn mobilization under neutral conditions was involved, since the formation of exchangeable compounds more predominantly contributed to immobilization. Test results on metal speciation in the marine clay-leachate system revealed that marine clay acted as an effective attenuation layer. These findings support the premise that Zn mobility is limited in the coastal MSWIA landfills. Secondly, a series of triaxial consolidated undrained (CU) compression tests were carried out on reconstituted waste samples before and after being cured in simulated coastal landfill leachate water for different periods in order to understand the aging effects on the mechanical properties of the landfilled waste layer. Peak shear strength and deformation modulus increased through curing. However, residual strength was not affected by differences in the curing periods. The waste mixture layer investigated in this study could possibly be used as a foundation layer with sufficient bearing capacity in post-closure use of coastal landfill sites.

Keywords

Coastal landfill Waste materials Heavy metal mobility Mechanical property 

References

  1. Åhnberg H (2007) On yield stresses and the influence of curing stresses on stress paths and strength measured in triaxial testing of stabilized soils. Can Geotech J 44(1):54–66CrossRefGoogle Scholar
  2. Araike H, Kambara H, Maeda H, Nonami S, Watanabe Y (2010) Physical and density characteristics of Kobe offshore reclamation disposal site. In: Proceedings of the 45th Japan national conference on geotechnical engineering, pp 471–472 (in Japanese)Google Scholar
  3. Athanasopoulos G (1993) Effects of ageing and overconsolidation on the elastic stiffness of a remoulded clay. Geotech Geoenviron Eng 11(1):51–65CrossRefGoogle Scholar
  4. Filgueiras AV, Lavilla I, Bendicho C (2002) Chemical sequential extraction for metal partitioning in environmental solid samples. J Environ Monit 4(6):823–857CrossRefGoogle Scholar
  5. Hem JD (1972) Chemistry and occurrence of cadmium and zinc in surface water and groundwater. Water Resour Res 8:661–678CrossRefGoogle Scholar
  6. Huang S, Chang C, Mui D, Chang F, Lee M, Wang C (2007) Sequential extraction for evaluating the leaching behavior of selected elements in municipal solid waste incineration fly ash. J Hazard Mater 149:180–188CrossRefGoogle Scholar
  7. Inui T, Oya Y, Plata H, Katsumi T, Kamon M (2009) Speciation and mobility assessment of heavy metals in the coastal municipal solid waste incinerator ash landfill. J ASTM Int 6(8):1–12CrossRefGoogle Scholar
  8. JGS 0051 (2009) Method of classification of geomaterials for engineering purposes. Jpn Geotech SocGoogle Scholar
  9. Kamon M, Zhang H, Katsumi T (2002) Redox effects on heavy metal mobility in landfill sites. Soils Found JGS 42(3):115–126CrossRefGoogle Scholar
  10. Nguyen CL, Inui T, Ikeda K, Katsumi T (2015) Aging effects on the mechanical property of waste mixture in coastal landfill sites. Soils Found 55(6):1441–1453CrossRefGoogle Scholar
  11. Plata H, Inui T, Katsumi T, Oya Y, Kamon M (2010) Speciation and mobility of zinc in coastal landfill sites with MSW incinerator ash. J Environ Eng ASCE 136(8):762–768CrossRefGoogle Scholar
  12. Rad NS, Clough GW (1984) New procedure for saturating sand specimens. J Geotech Eng 110(9):1205–1218CrossRefGoogle Scholar
  13. Sinan Bilgili M, Demir A, Ince M, Özkaya B (2007) Metal concentrations of simulated aerobic and anaerobic pilot scale landfill reactors. J Hazard Mater 145:186–194CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Graduate School of EngineeringOsaka UniversityOsakaJapan
  2. 2.Graduate School of Global Environmental StudiesKyoto UniversityKyotoJapan

Personalised recommendations