Modelling landfill leachate-induced clogging of field-scale test cells (mesocosms)

Author:

Cooke Andrew J.12,Rowe R. Kerry12

Affiliation:

1. Waste Management Specialist, Gartner Lee Limited, 300 Town Centre Boulevard, Suite 300, Markham, ON L3R 5Z6, Canada.

2. GeoEngineering Centre at Queen’s-RMC, Queen’s University, Kingston, ON K7L 3N6, Canada.

Abstract

A two-dimensional fluid flow and reactive transport model, BioClog, created to predict clogging in landfill leachate collection systems is used to calculate the clogging of gravel and treatment of leachate as it flows through the gravel in two real-scale experimental cells, called mesocosms, which represent the portion of a landfill drainage layer adjacent to a landfill collection pipe. These tests were conducted using real-time flows of landfill leachate and were run for about 6 and 12 years. The model computes spatial and temporal changes in clog quantity and composition. An empirical relationship predicts changes in hydraulic conductivity, and a variable mesh technique allows the surface to be free and dependent on calculated hydraulic heads. Calculated porosity change, effluent chemical oxygen demand (COD), and calcium concentrations, along with porosity and clog film thickness at termination are compared with the observed values and found to be in reasonable agreement given the variability and uncertainties associated with these processes.

Publisher

Canadian Science Publishing

Subject

Civil and Structural Engineering,Geotechnical Engineering and Engineering Geology

Reference51 articles.

1. ASTM. 2002. Standard test methods for specific gravity of soil solids by water pycnometer. ASTM standard D854. American Society for Testing and Materials, West Conshohocken, Pa.

2. Babcock, D.R.P. 2005. An evaluation of model parameters for clogging of coarse drainage materials in landfill leachate collection systems. Master’s thesis, Queen’s University, Kingston, Ont.

3. Laboratory investigation of flow rate through composite liners consisting of a geomembrane, a GCL and a soil liner

4. Bass, J.M. 1986. Avoiding failure of leachate collection and cap drainage systems. United States Environmental Protection Agency, Land Pollution Control Division, Hazardous Waste Engineering Research Laboratory, Cincinnati, Ohio. EPA-600/2–86–058.

5. Cooke, A.J. 2007. Modelling the clogging of landfill leachate collection systems. Ph.D. thesis, The University of Western Ontario, London, Ont.

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