Advertisement

Sorption of Lead to Slurry Trench Cutoff Wall Backfills Comprised of SHMP-Amended Ca-Bentonite

  • Yu-Ling Yang
  • Krishna R. Reddy
  • Yan-Jun Du
  • Ri-Dong Fan
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

This study investigated effects of phosphate dispersant on lead (typical heavy metal) sorption capacity of the sand/Ca-bentonite backfill for slurry trench cutoff walls. Several series of batch sorption tests were conducted using backfills consisting of sand and 20% Ca-bentonite with/without dispersant, as well as amended/un-amended Ca-bentonite alone. First, amended/un-amended backfills and amended Ca-bentonite were prepared. Next, aqueous solutions with 0 to 40,000 mg/L Pb concentration were prepared. Finally, the backfills and the Ca-bentonites were mixed with the solution in liquids to solid ratio of 10 and shaken for 24 h. The mixture was then centrifuged, and the supernatant was separated and analyzed for Pb concentration. The results show that the relationship between the amount of sorption and equilibrium concentration of Pb was well quantified by Langmuir and Freundlich isotherm models. Phosphate dispersant significantly increased Pb sorption capacity of both the sand/Ca-bentonite backfill and Ca-bentonite. The sorption process of the Pb onto the backfills or Ca-bentonites was found to be favorable. Overall, phosphate dispersant is shown to be a promising additive to sand/Ca-bentontie backfill in slurry trench cutoff wall construction for effective containment of Pb-laden groundwater.

Keywords

Calcium bentonite Slurry walls Sorption Lead 

Notes

Acknowledgements

Financial support for this project was provided by Primary Research & Development Plan of Jiangsu Province (Grant No. BE2017715) and National Natural Science Foundation of China (Grant Nos. 41330641, 51278100 and 41472258). The authors thank the Colloid Environmental Technologies Co. (CETCO) for providing the bentonite used in this study, and the China Scholarship Council for making it possible to undertake this research at the University of Illinois at Chicago.

References

  1. 1.
    D’Appolonia DJ (1980) Soil-bentonite slurry trench cutoffs. J Geotech Eng Div 106(4):399–417Google Scholar
  2. 2.
    Sharma HD, Reddy KR (2004) Geoenvironmental engineering: site remediation, waste containment, and emerging waste management technologies. Wiley, HobokenGoogle Scholar
  3. 3.
    Evans JC, Adams TL, Prince MJ (1997) Metals attenuation in minerally enhanced slurry walls. In: 1997 International containment technology conference, National Technical Information Service, pp 679–687. Springfield, VAGoogle Scholar
  4. 4.
    Du YJ, Hayashi S, Xu YF (2004) Some factors controlling the adsorption of potassium ions on clayey soils. Appl Clay Sci 27(3):209–213CrossRefGoogle Scholar
  5. 5.
    Du YJ, Hayashi S (2006) A study on sorption properties of Cd2+ on Ariake clay for evaluating its potential use as a landfill barrier material. Appl Clay Sci 32(1):14–24CrossRefGoogle Scholar
  6. 6.
    Malusis MA, Maneva JE, Barben EJ, Shackelford CD, Daniels ER (2010) Influence of adsorption on phenol transport through soil–bentonite vertical barriers amended with activated carbon. J Contam Hydrol 116(1):58–72CrossRefGoogle Scholar
  7. 7.
    Fan RD, Du YJ, Liu SY, Yang YL (2014) Sorption of Pb(II) from aqueous solution to clayey soil/calcium-bentonite backfills for slurry-trench walls. In: 7th International congress on environmental geotechnics, pp. 1566–1573. Engineers Australia, MelbourneGoogle Scholar
  8. 8.
    Hong CS, Shackelford CD, Malusis MA (2016) Adsorptive behavior of zeolite-amended backfills for enhanced metals containment. J Geotech Geoenviron Eng 142(7):04016021CrossRefGoogle Scholar
  9. 9.
    Yang YL (2017) Contaminant containment performances of soil-phosphate amended calcium bentonite vertical cutoff walls. Ph.D. thesis, Southeast University, Nanjing, ChinaGoogle Scholar
  10. 10.
    Du YJ, Yang YL, Fan RD, Wang F (2016) Effects of phosphate dispersants on the liquid limit, sediment volume and apparent viscosity of clayey soil/calcium-bentonite slurry wall backfills. KSCE J Civ Eng 20(2):670–678CrossRefGoogle Scholar
  11. 11.
    Yang YL, Du YJ, Reddy KR, Fan RD (2017) Phosphate-amended sand/Ca-bentonite mixtures as slurry trench wall backfills: assessment of workability, compressibility and hydraulic conductivity. Appl Clay Sci 142:120–127CrossRefGoogle Scholar
  12. 12.
    Yang YL, Reddy K, Du YJ, Fan RD (2018) Short-term hydraulic conductivity and consolidation properties of soil-bentonite backfills exposed to CCR-impacted groundwater. J Geotech Geoenviron Eng 144(6):04018025CrossRefGoogle Scholar
  13. 13.
    Reddy KR, Xie T, Dastgheibi S (2014) Removal of heavy metals from urban stormwater runoff using different filter materials. J Environ Chem Eng 2(1):282–292CrossRefGoogle Scholar
  14. 14.
    Langmuir I (1916) The constitution and fundamental properties of solids and liquids. Part I. Solids. J Am Chem Soc 38(11):2221–2295CrossRefGoogle Scholar
  15. 15.
    Freundlich HMF (1906) Over the adsorption in solution. J Chem Phys 57:385–471Google Scholar
  16. 16.
    Yang YL, Reddy K, Du YJ, Fan RD (2018) SHMP amended calcium bentonite for slurry trench cutoff walls: workability and microstructure characteristics. Can Geotech J 55(4):528–537CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Yu-Ling Yang
    • 1
  • Krishna R. Reddy
    • 2
  • Yan-Jun Du
    • 1
  • Ri-Dong Fan
    • 1
  1. 1.Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Institute of Geotechnical EngineeringSoutheast UniversityNanjingChina
  2. 2.Department of Civil and Materials EngineeringUniversity of Illinois at ChicagoChicagoUSA

Personalised recommendations