Advertisement

Analysis on contaminants transport process through clay-solidified grouting curtain in MSW landfills

  • Chen Yong-gui Email author
  • Zhang Ke-neng 
  • Huang Chang-bo 
Geology, Mining And Civil Engineering

Abstract

Clay-solidified grouting curtains are commonly used for remediation by containment or pollution prevention, in addition to their use as a barrier to water flow in municipal solid waste(MSW) landfills. A hydrological model of water flow and a hydrodynamic model of contaminant are presented to simulate the migration of leachate through clay-solidified grouting curtain in MSW landfills, with particular attention paid to the role of diffusive and adsorptive fluxes in contaminant transport. The models were applied to simulate the sensitivity of the curtain’s behavior to changes in parameters, such as thickness, depth, permeability coefficient, diffusion coefficient, resistance coefficient and concentration, and also to demonstrate the contaminant distribution on the evolution of travel time and offset distance of clay-solidified grouting curtain in landfills. It is found that a part of leachate components stays or is retarded in clay-solidified grouting curtain by precipitate or exchange, the retention rate is closely related to composition of clay-solidified grouting curtain, more than 80%, and the maximum occurs at the cementclay ratio of 2 : 4 under experimental conditions. Contamination distribution is variable on travel time and offset distance, the highest concentration takes place where the contamination intensity is nearest to the pollution resource or takes place at early middle period of transport, and the pollutant attenuates gradually. The results indicate that claysolidified grouting curtain with a proper thickness, a low permeability coefficient and a high resistance coefficient might serve as a sufficiently effective vertical barrier against leachate seepage and contamination migration in MSW landfills.

Key words

clay-solidified grouting curtain contaminant transport landfills 

CLC number

X705 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Erses A S, Fazal M A, Onaya T T, et al. Determination of solid waste sorption capacity for selected heavy metals in landfills [J]. Journal of Hazardous Materials, 2005, 121(1–3): 223–232.Google Scholar
  2. [2]
    Abollino O, Aceto M, Malandrino M, et al. Adsorption of heavy metals on Na-montmorillonite: Effect of pH and organic substances [J]. Water Research, 2003, 37(7): 1619–1627.CrossRefGoogle Scholar
  3. [3]
    Colebrand International Limited. Sanitary landfill [EB/OL]. http://www.colebrand.com/wastsl.htm, 2005.Google Scholar
  4. [4]
    KANG Yu, LU An-huai, ZHOU Ping, et al. Adsorption results and discussion of organic pollutant with natural clay in Peking Liulitun Waste Landfill [J]. China Non-metallic Mining Industry Herald, 2003, 32(2): 42–44. (in Chinese)Google Scholar
  5. [5]
    CHEN Yong-gui, ZHANG Ke-neng, WEI Zhong-chao, et al. Application of swing jet-grouting and clay-solidified grouting on the treatment of seepage[J]. Construction Technique, 2003, 32(1): 41–43. (in Chinese)Google Scholar
  6. [6]
    CHEN Yong-gui. ZHANG Ke-neng. WEI Zhong-chao, et al. Several problems with the rest of the jet grouted vertical sealing diaphragm-wall enclosure [J]. Exploration Engineering Rock & Soil Drilling and Tunneling, 2003, 29(1): 12–14. (in Chinese)Google Scholar
  7. [7]
    ZHANG Ke-neng, ZOU Yin-sheng, WANG Yi-sun. Experiment and application of clay-cement slurry in grouting curtain of rubbish-buried site [J]. Journal of Hunan University (Natural Science), 1999, 26(5): 76–80. (in Chinese)Google Scholar
  8. [8]
    DENG Fei-yue, ZHANG Ke-neng, YANG Ming. Effects of clay-solidified grouting curtain on retard function to pollutants in solid-waste landfill [J]. Journal of Central South University (Natural Science), 2000, 31(6): 524–527. (in Chinese)Google Scholar
  9. [9]
    Fernandes L, Warith M A, La F F. Modelling of contaminant transport within a marshland environment[J]. Waste Management, 1996, 16(7): 649–661.CrossRefGoogle Scholar
  10. [10]
    ZHANG Ke-neng, TIAN Qin-yu, DENG Fei-yue, et al. Retardation capability of clay-solidified grouting curtain by column test [J]. Journal of Central South University (Natural Science), 2004, 35(3): 73–77. (in Chinese)Google Scholar
  11. [11]
    KONG De-fang. Conspectus of waste sanitary landfills and its geoenvironmental effects [J]. Geology calamity and environment protect, 1999, 10(S): 1–11. (in Chinese)Google Scholar
  12. [12]
    Foged N, Baumann J. Clay membrane made of natural high plasticity clay: leachate migration due to advection and diffusion [J]. Engineering Geology, 1999, 54(1–2): 129–137.CrossRefGoogle Scholar
  13. [13]
    WU Guang-xi, LI L Y. Modeling of heavy metal migration in sandrbentonite and the leachate pH effect [J]. Journal of Contaminant Hydrology, 1998, 33(3–4): 313–336.CrossRefGoogle Scholar
  14. [14]
    Howard K W F, Livingstone S. Transport of urban contaminants into Lake Ontario via sub-surface flow [J]. Urban Water, 2000, 2(3): 183–195.CrossRefGoogle Scholar
  15. [15]
    Philip L K. An investigation into contaminant transport processes through single-phase cement-bentonite slurry walls [J]. Engineering Geology, 2001, 60(1–4): 209–221.CrossRefGoogle Scholar
  16. [16]
    Kool J B, Huyakorn P S, Sudicky E A, et al. A composite modeling approach for subsurface transport of degrading contaminants from land-disposal sites [J]. Journal of Contaminant Hydrology, 1994, 17(1): 69–90.CrossRefGoogle Scholar
  17. [17]
    Erses S A, Onay T T. In situ heavy metal attenuation in landfills under methanogenic conditions [J]. Journal of Hazardous Materials, 2003, 99(2): 159–175.CrossRefGoogle Scholar
  18. [18]
    Schlege M L, Charlet L, Manceau A. Sorption of metal ions on clay minerals—II. Mechanism of Co sorption on hectorite at high and low ionic strength and impact on the sorbent stability [J]. Journal of Colloid and Interface Science, 1999, 220(2): 392–405.CrossRefGoogle Scholar
  19. [19]
    Roehl K E, Czurda K. Diffusion and solid speciation of Cd and Pb in clay liners [J]. Applied Clay Science, 1998, 12(5): 387–402.CrossRefGoogle Scholar
  20. [20]
    Yong R N, Yaacob W Z W, Bentley S P, et al. Partitioning of heavy metals on soil samples from leaching column tests [J]. Engineering Geology, 1999, 60(1–4): 307–322.Google Scholar

Copyright information

© Central South University 2005

Authors and Affiliations

  • Chen Yong-gui 
    • 1
    • 2
    Email author
  • Zhang Ke-neng 
    • 3
  • Huang Chang-bo 
    • 4
  1. 1.School of Bridge and Structural EngineeringChangsha University of Science and TechnologyChangshaChina
  2. 2.College of Civil EngineeringHunan UniversityChangshaChina
  3. 3.School of Geoscience and Environmental EngineeringCentral South UniversityChangshaChina
  4. 4.China Construction First Group Corporation LimitedBeijingChina

Personalised recommendations