Project Duration:
November 1st, 2017 – October 31st, 2018
Investigators:
Prof: Tarek Abichou, Ph.D. P.E. and Youneng
Tang, Ph.D.
FAMU – FSU Dept. of Civil and Env. Eng.
Email: abichou@eng.fsu.edu, Phone:
(850)410-6661
Email: ytang@eng.fsu.edu, Phone:
(850)410-6119
MSW incinerator (MSW-I) residues
are being landfilled in MSW landfills or mono-filled in Florida. Leachates from
these types of waste are different from regular MSW leachate and can affect the
performance of Geosynthetic Clay Liners (GCLs), widely used in Florida. GCLs are hydraulic barrier systems in which a
thin layer of bentonite (<10 mm) is fixed between two geotextiles by needle
punching or glued to a geomembrane. In the first generation GCLs, sodium
bentonite (Na-B), hydrates upon exposure to liquids such as deionized water and
swells significantly. However, aggressive characteristics of the hydrating
liquid in contact with bentonites in GCLs, such as leachate from CCPP and MSW-I
landfills may alter the bentonite fabric and lead to unacceptable increases in
hydraulic conductivity. Several new GCL products have been developed for these
high ionic strength leachates. Polymer-modified
bentonites (PMBs) GCLs containing a blend of Na-B and various polymers have
been introduced in recent years to improve the chemical compatibility and
hydraulic performance of GCLs contacted with aggressive leachates. These GCLs
are referred as second generation GCLs.
The main objective of this study is to test the resistance
of PMBs GCLs from different vendors to aggressive leachates from MSW-I
landfills and CCPP landfills from Florida, and to identify conditions where
these new types of GCLs might not be adequate (such as negative gradient
landfills and fluctuating groundwater table). The second objective of this
study is to use conventional index tests (e.g., free swell, fluid loss) and develop
new alternative index tests to predict the long term hydraulic performance of these
new types of GCLs.
Hydraulic conductivity of different new types of GCLs containing natural sodium bentonite (Na-B) and GCLs containing various polymers from different vendors will be measured in flexible wall permeameters. Specimens will be permeated with water, synthetic leachates, and leachates from MSW-I landfills across the state of Florida. The chemical composition of each leachate will also be characterized. Index properties of the bentonite from each GCL will be determined and correlated to hydraulic properties of the GCL.
TAG Group Members:
TAG Meetings:
TAG Meeting 1
TAG For Effects of Florida Leachates on GCLs (ABICHOU)
Fri, Feb 2, 2018 10:00 PM - 12:00 AM EST
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TAG Meeting 2
Progress Reports: