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.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
D’Appolonia DJ (1980) Soil-bentonite slurry trench cutoffs. J Geotech Eng Div 106(4):399–417
Sharma HD, Reddy KR (2004) Geoenvironmental engineering: site remediation, waste containment, and emerging waste management technologies. Wiley, Hoboken
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, VA
Du YJ, Hayashi S, Xu YF (2004) Some factors controlling the adsorption of potassium ions on clayey soils. Appl Clay Sci 27(3):209–213
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):14–24
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):58–72
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, Melbourne
Hong CS, Shackelford CD, Malusis MA (2016) Adsorptive behavior of zeolite-amended backfills for enhanced metals containment. J Geotech Geoenviron Eng 142(7):04016021
Yang YL (2017) Contaminant containment performances of soil-phosphate amended calcium bentonite vertical cutoff walls. Ph.D. thesis, Southeast University, Nanjing, China
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):670–678
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 142:120–127
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):04018025
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):282–292
Langmuir I (1916) The constitution and fundamental properties of solids and liquids. Part I. Solids. J Am Chem Soc 38(11):2221–2295
Freundlich HMF (1906) Over the adsorption in solution. J Chem Phys 57:385–471
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):528–537
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.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Yang, YL., Reddy, K.R., Du, YJ., Fan, RD. (2019). Sorption of Lead to Slurry Trench Cutoff Wall Backfills Comprised of SHMP-Amended Ca-Bentonite. In: Zhan, L., Chen, Y., Bouazza, A. (eds) Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2. ICEG 2018. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-2224-2_66
Download citation
DOI: https://doi.org/10.1007/978-981-13-2224-2_66
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-13-2223-5
Online ISBN: 978-981-13-2224-2
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)