Change in leachate chemistry and porosity as leachate permeates through tire shreds and gravel

Reagan McIsaac; R Kerry Rowe

doi:10.1139/t05-050

Change in leachate chemistry and porosity as leachate permeates through tire shreds and gravel

Canadian Geotechnical Journal ◽

10.1139/t05-050 ◽

2005 ◽

Vol 42 (4) ◽

pp. 1173-1188 ◽

Cited By ~ 28

Author(s):

Reagan McIsaac ◽

R Kerry Rowe

Keyword(s):

Hydraulic Conductivity ◽

Attractive Potential ◽

Spatial And Temporal Variation ◽

Equivalent Thickness ◽

Leachate Collection ◽

Rubber Tire ◽

Tire Shreds ◽

Potential Alternative ◽

Long Term Performance ◽

Term Performance

Rubber tire shreds are an attractive potential alternative to conventional gravel in the drainage layer of leachate collection systems at the base of landfills, yet the clogging and thus the long-term performance of tire shreds in this application is not known. This paper presents the results of an experimental investigation into the clogging potential of rubber tire shreds used as part of a leachate collection system at the base of a landfill when permeated with leachate. Experimental columns filled with two different rubber tire shreds and a conventional gravel drainage material were used to study the spatial and temporal variation of leachate characteristics and porosity changes within the drainage materials. It is shown that there are significant differences in the pore structures of the drainage materials and that these differences affect clog development and the length of time it takes for the hydraulic conductivity to drop below a threshold of 105 m/s. The gravel is found to have a service life at least three times greater than that of an equivalent thickness of compressed (at 150 kPa) tire shred.Key words: tire shreds, landfill, clogging, hydraulic conductivity, porosity, leachate collection.

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A review of the mechanical and leaching performance of stabilized/solidified contaminated soils

Environmental Reviews ◽

10.1139/er-2013-0004 ◽

2014 ◽

Vol 22 (1) ◽

pp. 66-86 ◽

Cited By ~ 41

Author(s):

Reginald B. Kogbara

Keyword(s):

Fly Ash ◽

Hydraulic Conductivity ◽

Contaminated Soils ◽

Superior Performance ◽

Complex Nature ◽

Optimum Water Content ◽

The Matrix ◽

Long Term Performance ◽

Term Performance

Stabilization/solidification (S/S) technology, which basically involves chemical fixation and immobilization of contaminants (primarily metals) in the matrix of cementitious binders, is widely used for treatment of contaminated soils. This paper presents a critical review of the performance of commonly used blended binder systems in S/S technology. The binders considered are Portland cement and blends of cement–fly ash, cement–slag, lime–slag, and lime–fly ash. This work compares and evaluates the performance of contaminated soils treated by the binders in terms of commonly used mechanical and leaching properties, including unconfined compressive strength (UCS), bulk density, hydraulic conductivity, and leachability. The long-term performance of S/S-treated soils is also reviewed. It was observed that the inclusion of slag in a binder blend gave superior performance compared to fly ash. Generally, the leachability of common contaminants in soil can be reduced to acceptable levels with approximately 20%–35% dosage of the different binders. The UCS was observed to be optimum around the optimum water content for compaction. The hydraulic conductivity was approximately 10−9 m/s over time. Long-term performance of treated soils showed consistent effectiveness over a period of 5–14 years with fluctuations in mechanical and leaching behaviour caused by the complex nature and variability of S/S-treated soils.

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