Abstract
Carboxymethyle cellulose (CMC) is considered to enhance the chemical compatibility of bentonite in terms of hydraulic conductivity. In this study, a series of modified fluid loss (MFL) tests is conducted to investigate the hydraulic conductivity (k) of CMC-treated bentonite when exposed to heavy metal contaminant and landfill leachate. CMC content in bentonite is set at 0% (i.e., untreated bentontie) and 10% (i.e., CMC-treated). Lead-zinc nitrate mixture is selected as representative heavy metal contaminants; and calcium chloride is also used for comparison. Total metal concentrations of the chemical liquid ranged from 0 to 20 mmol/L. The result indicated that minimal change in k of CMC-bentonite is found from the MFL test; whereas the k value of untreated bentonite significantly increased with increased Pb-Zn and Ca concentration. The k value of untreated bentonite is approximately 20 times higher than that of CMC-treated bentonite for a given void ratio. In addition, it is found that the impact of landfill leachate on the hydraulic conductivity is insignificant for CMC-treated bentonite. The k of CMC-treated bentonite considerably lower than that of untreated bentonite when exposed to the leachate.
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References
Bohnhoff GL, Shackelford CD (2014) Hydraulic conductivity of polymerized bentonite-amended backfills. J Geotech Geoenviron Eng 140(3):04013028
Chung J, Daniel DE (2008) Modified fluid loss test as an improved measure of hydraulic conductivity for bentonite. Geotech Test J ASTM 31(3):243–251
Di Emidio G (2010) Hydraulic and chemico-osmotic performance of polymer treated clays. Ghent University, Ghent
Di Emidio G, Mazzieri F, Verastegui-Flores RD, Van Impe W, Bezuijen A (2015) Polymer-treated bentonite clay for chemical-resistant geosynthetic clay liners. Geosynth Int 22(1):125–137
Du YJ, Fan RD, Reddy KR, Liu SY, Yang YL (2015a) Impacts of presence of lead contamination in clayey soil–calcium bentonite cutoff wall backfills. Appl Clay Sci 108:111–122
Du YJ, Fan RD, Liu SY, Reddy KR, Jin F (2015b) Workability, compressibility and hydraulic conductivity of zeolite-amended clayey soil/calcium-bentonite backfills for slurry-trench cutoff walls. Eng Geol 195:258–268
Fan RD, Du YJ, Reddy KR, Liu SY, Yang YL (2014) Compressibility and hydraulic conductivity of clayey soil mixed with calcium bentonite for slurry wall backfill: Initial assessment. Appl Clay Sci 101:119–127
Katsumi T, Ishimori H, Onikata M, Fukagawa R (2008) Long-term barrier performance of modified bentonite materials against sodium and calcium permeant solutions. Geotext Geomembr 26(1):14–30
Liu SY, Fan RD, Du YJ, Yang YL (2016) Modified fluid loss test to measure the hydraulic conductivity of heavy metal-contaminated bentonite filter cakes. Paper presented at the Geo-Chicago 2016: sustainable geoenvironmental systems, Chicago, IL
Liu Y, Gates WP, Bouazza A, Rowe RK (2013) Fluid loss as a quick method to evaluate hydraulic conductivity of geosynthetic clay liners under acidic conditions. Can Geotech J 51(2):158–163
Madejová J (2003) FTIR techniques in clay mineral studies. Vib Spectrosc 31(1):1–10
Malusis MA, McKeehan MD (2013) Chemical compatibility of model soil-bentonite backfill containing multiswellable bentonite. J Geotech Geoenviron Eng 139(2):189–198
Qiu H, Yu J (2008) Polyacrylate/(carboxymethylcellulose modified montmorillonite) superabsorbent nanocomposite: preparation and water absorbency. J Appl Polym Sci 107(1):118–123
Rosin-Paumier S, Touze-Foltz N, Pantet A (2011) Impact of a synthetic leachate on permittivity of GCLs measured by filter press and oedopermeameter tests. Geotext Geomembr 29(3):211–221
Scalia J IV, Benson CH (2011) Hydraulic conductivity of geosynthetic clay liners exhumed from landfill final covers with composite barriers. J Geotech Geoenviron Eng 137(1):1–13
Shackelford CD, Sample-Lord KM (eds) (2014) Hydraulic conductivity and compatibility of bentonite for hydraulic containment barriers, vol GSP 233. ASCE, Reston
Sharma HD, Reddy KR (2004) Geoenvironmental engineering: site remediation, waste containment, and emerging waste management technologies. Wiley, New York
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
Yong RN, Ouhadi VR, Goodarzi AR (2009) Effect of Cu2+ ions and buffering capacity on smectite microstructure and performance. J Geotech Geoenviron Eng 135(12):1981–1985
Acknowledgements
The authors are grateful for the financial support of the National Natural Science Foundation of China (Grant No. 51278100, 41330641 and 41472258), Key Program of Natural Science Foundation of Jiangsu Province (Grant No. BE2017715).
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Fan, RD., Liu, SY., Du, YJ., Reddy, K.R., Yang, YL. (2019). Chemical Compatibility of CMC-Treated Bentonite Under Heavy Metal Contaminants and Landfill Leachate. 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_52
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DOI: https://doi.org/10.1007/978-981-13-2224-2_52
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