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Bentonite barrier compositions and related geosynthetic clay liners for use in containment applications

a technology of bentonite and containment, applied in the direction of protective foundations, foundation engineering, construction, etc., can solve the problems of adversely affecting the absorbency of bentonite, and achieve the effect of enhancing the low permeability

Inactive Publication Date: 2012-08-30
HALLIBURTON ENERGY SERVICES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0002]The present invention relates to improved bentonite barrier compositions, and more particularly, to the use of geosynthetic clay liners comprising these improved bentonite barrier compositions having enhanced low permeability over time in containment applications.

Problems solved by technology

While bentonite is highly absorbent, able to absorb water several times its dry mass, aqueous fluids having complex chemistries can adversely affect its absorbency.

Method used

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  • Bentonite barrier compositions and related geosynthetic clay liners for use in containment applications
  • Bentonite barrier compositions and related geosynthetic clay liners for use in containment applications
  • Bentonite barrier compositions and related geosynthetic clay liners for use in containment applications

Examples

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Effect test

example 1

[0058]In order to demonstrate the effectiveness of geosynthetic clay liner of the present invention, permeability parameters of geosynthetic clay liners were measured in solutions comprising complex electrolyte chemistries over time. Acid mine leachate, a synthetic leachate (Solution 1 as described in Table 2), and fly-ash leachate, an in situ leachate taken from real world depository (Solution 2 as described in Table 2) samples were analyzed by a third party independent lab. The composition of these leachates are given in Table 2 below. The testing of the liners was performed with these leachates. Additionally, different initial moisture contents of the bentonite in the bentonite barrier composition in the liner were tested to determine the effect of the initial moisture content on the retained permeability observed with the varying solution chemistries at a confining stress of 5.0 psi.

TABLE 2Liquid Analysis with High Ionic StrengthAcid MineFly-AshDrainageLeachate(Synthetic)(Real W...

example 2

[0065]The goal of this test was to explore the permeability of an unamended bentonite composition, i.e., one that does not contain a polyanionic low molecular weight polymer according to the present invention, without a liner. The ASTM D6766 standard protocol per GRI-GCL3 was used at a confining stress of 5.0 psi. The synthetic brine in the experiment contained 0.1N (or approximately 12,000 mg / L) CaCl2.

[0066]FIG. 2 shows that a sharp increase in permeability was observed after approximately 220 hours (˜9 days) in the synthetic brine. Thus, the data in FIG. 2 confirms the lack of retained permeability of a standard unamended bentonite in electrolyte conditions as shown in FIG. 1 within a reasonable margin of error.

example 3

[0067]In this example, ASTM D5084 protocol was used to evaluate the retained permeability of certain bentonite barrier compositions comprising approximately 99% bentonite and approximately 1% polyanionic cellulose (not incorporated within a geosynthetic clay liner) of the present invention in fly-ash leachate (Solution 2 in Table 2). This is referred to as amended bentonite in Table 3. This experiment involved measuring the permeability of the bentonite barrier composition sample in a leachate solution at a confining stress of 5.0 psi. The permeability was measured after 11 days of being in contact with the leachate solution. The result of the experiment is summarized in Table 3 below.

[0068]Table 3 shows that the bentonite barrier composition displayed a retained permeability of approximately 6×10−10 cm / s, which indicates that the bentonite barrier composition of the present invention is able to maintain an enhanced retained permeability. Thus, this Example suggests that the bentoni...

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Abstract

The present invention relates to improved bentonite barrier compositions having enhanced low permeability over time in containment applications. Of the many embodiments provided herein, one embodiment includes a geosynthetic clay liner comprising: at least one geosynthetic layer; and a bentonite barrier composition comprising: bentonite and a polyanionic low molecular weight polymer.

Description

RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 61 / 437,497, filed on Jan. 28, 2011, entitled “Improved Bentonite Barrier Compositions and Related Geosynthetic Clay Liners for Use in Containment Applications”, the disclosure of which is hereby incorporated by reference.BACKGROUND[0002]The present invention relates to improved bentonite barrier compositions, and more particularly, to the use of geosynthetic clay liners comprising these improved bentonite barrier compositions having enhanced low permeability over time in containment applications.[0003]Various materials and procedures have been developed and utilized to form low permeability barriers in containment applications. For example, low permeability barriers are needed to separate waste fluids from contaminating the surrounding environment in fly-ash repositories, industrial mineral and metal mining sites, and landfill sites. These barriers are also usef...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E02D3/12
CPCE02D31/004
Inventor LANDIS, CHARLES R.YOUNGBLOOD, JIMMY G.LIAO, WEN-CHIN ANDREWCOLES, BRIAN L.
Owner HALLIBURTON ENERGY SERVICES INC
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