Modelling of electrokinetic phenomena in soils

PhD Thesis


Huweg, Abdurrahman Feturi S.. 2013. Modelling of electrokinetic phenomena in soils. PhD Thesis Doctor of Philosophy. University of Southern Queensland.
Title

Modelling of electrokinetic phenomena in soils

TypePhD Thesis
Authors
AuthorHuweg, Abdurrahman Feturi S.
SupervisorAhfock, Tony
Raine, Steven
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages185
Year2013
Abstract

The aim of this work was to develop theoretical methods for the prediction of remediation time and the electrical energy requirements for the remediation of soil
contaminated with sodium chloride. Laboratory scale experiments were specially designed and performed on sand and clay samples at field capacity moisture content
to identify the key features of electrokinetic processes in soil. The experiments confirmed the existence of a prominent ionic concentration or conductivity front
travelling away from the cathode. The dissertation offers a novel theoretical explanation that links this front to the electronegative charge bound onto soil particles. A mathematical model of electromigration in soil is developed based on that theory. The model is essentially a set of partial differential equations (PDEs) with some coefficients behaving non-linearly. An algorithm for numerical solution of the PDEs is developed using a finite difference time domain approach. Reasonable agreement was found between laboratory test results and prediction of
the corresponding numerical models. In addition, approximate analytical solutions to the PDEs allow remediation time and remediation energy requirements to be
evaluated. The results of this work may be generalised to soils with ionic contamination other than sodium chloride.

Keywordssoil remediation; sodium chloride; electromigration
ANZSRC Field of Research 2020410699. Soil sciences not elsewhere classified
400899. Electrical engineering not elsewhere classified
Byline AffiliationsFaculty of Health, Engineering and Sciences
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