INSPIRING FUTURES

Moisture retention and conductivity properties of waste refuse: a laboratory study.

Kazimoglu, Yasar Kamil (2007) Moisture retention and conductivity properties of waste refuse: a laboratory study. PhD thesis, Edinburgh Napier University.

[img]
Preview
PDF
Available under License Creative Commons Attribution Non-commercial.

Download (8MB) | Preview

    Abstract/Description

    The modelling of infiltration and moisture movement within a porous medium
    requires information on the moisture retention and hydraulic conductivity properties.
    In this study, the unsaturated hydraulic behaviour of a compacted waste sample based
    on the composition of Lyndhurst Landfill site in Melbourne, Australia was
    investigated in laboratory. Two fundamental aim of the study were to establish the
    moisture retention characteristics of Municipal Solid Waste (MSW) sample and
    measure its unsaturated hydraulic conductivity.
    In landfilled waste, the particle and pore size distribution, heterogeneity of waste
    composition and leachate chemistry complicate the determination of moisture
    retention and hydraulic conductivity. In this study the modification and use of a
    standard pressure plate apparatus was described which can be used establish moisture
    retention properties of samples of 230 mm in diameter. The experiments showed that
    the moisture retention characteristics of compacted waste sample were comparable to
    soils. It has been shown that water retention in waste is a function of its position
    relative to the phreatic surface, in other words, its hydraulic boundary conditions
    which will vary with elevation. Some difficulties and limitations of using this method
    were discussed.
    As with conventional inert soils, laboratory determination of unsaturated hydraulic
    conductivity is difficult and recourse is often made to analytical methods as those
    presented by van Genuchten (1980). One aim of this study was to compare the
    unsaturated hydraulic conductivity of MSW obtained using Passioura' s (1976) onestep
    outflow test method with predictions using van Genuchten's model. Good agreement is observed between the predictive model and experimental method for
    unsaturated hydraulic conductivities at low moisture contents but there is poor
    agreement at high degrees of saturation. This latter discrepancy is attributed to the
    difficulty of measuring retention properties of large pores at low suctions and the
    applicability of the van Genuchten model to such a material. Results also suggest that
    dual porosity exists within waste.

    Item Type: Thesis (PhD)
    Uncontrolled Keywords: Moisture retention; waste refuse; unsaturated hydraulic conductivity; landfill waste; inert soil;
    University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
    Dewey Decimal Subjects: 600 Technology > 620 Engineering > 628 Sanitary & municipal engineering
    Library of Congress Subjects: T Technology > TD Environmental technology. Sanitary engineering
    Item ID: 5106
    Depositing User: Mr David Main
    Date Deposited: 21 Mar 2012 15:40
    Last Modified: 21 Mar 2012 15:40
    URI: http://researchrepository.napier.ac.uk/id/eprint/5106

    Actions (login required)

    View Item

    Document Downloads

    More statistics for this item...

    Edinburgh Napier University is a registered Scottish charity. Registration number SC018373