Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

The modelling of leachate generation and transport is important for estimating the possible groundwater pollution below the sanitary landfills. The numerical solution of the mathematical models for the total solids (inorganic) and chemical oxygen demand (organic) transport is presented. The existing one dimensional leachate transport model which accounts for advection and diffusion is modified with the addition of desorption term and the simulation results are compared for different case studies from the literature. The maximum error is reduced to 28.24 % with modified inorganic model against 38.93 % with the existing model for the TS concentration when simulated with literature data. The mass transfer term is retarded by the introduction of desorption term and is reduced only up to 58.6 % at the end of simulation period with the modified model, instead of 24.16% for the existing model. The simulated COD concentration curve follows a hydrograph trend with a peak after 200 days and then it follows a sudden decrease. The organic activity is found to be affected more by the inclusion of desorption term by decreasing the peak concentration and the time to reach the peak concentration. It is gleaned that the inclusion of desorption term in the existing model has resulted in retardation of mass transfer mechanisms, which simulated a close fit to the observed data. The organic activity is observed to be affected by desorption for moderate values.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Simulation of Inorganic and Organic Contaminants Transport in Sanitary Landfills

Chicago, Illinois

The modelling of leachate generation and transport is important for estimating the possible groundwater pollution below the sanitary landfills. The numerical solution of the mathematical models for the total solids (inorganic) and chemical oxygen demand (organic) transport is presented. The existing one dimensional leachate transport model which accounts for advection and diffusion is modified with the addition of desorption term and the simulation results are compared for different case studies from the literature. The maximum error is reduced to 28.24 % with modified inorganic model against 38.93 % with the existing model for the TS concentration when simulated with literature data. The mass transfer term is retarded by the introduction of desorption term and is reduced only up to 58.6 % at the end of simulation period with the modified model, instead of 24.16% for the existing model. The simulated COD concentration curve follows a hydrograph trend with a peak after 200 days and then it follows a sudden decrease. The organic activity is found to be affected more by the inclusion of desorption term by decreasing the peak concentration and the time to reach the peak concentration. It is gleaned that the inclusion of desorption term in the existing model has resulted in retardation of mass transfer mechanisms, which simulated a close fit to the observed data. The organic activity is observed to be affected by desorption for moderate values.