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Full-Text Articles in Engineering
Installation Of A Lime Injection Barrier For The Remediation Of Acid Sulphate Soil Problems, Buddhima Indraratna, A. N. Golab, Laura J. Banasiak
Installation Of A Lime Injection Barrier For The Remediation Of Acid Sulphate Soil Problems, Buddhima Indraratna, A. N. Golab, Laura J. Banasiak
Faculty of Engineering - Papers (Archive)
Oxidation of naturally occurring pyrite (FeS2) in certain low-lying clayey soils generates sulphuric acid, hence the term acid sulphate soils. A horizontal alkaline barrier was installed by radial grouting, for the purpose of remediating leachate from acid sulphate soils and preventing further oxidation. The current research relates to a large-scale field trial of this technique and the effect on the groundwater composition. In coastal Australia, a pyritic layer commonly exists in the soil at shallow depth that is at risk of oxidation, hence the main objective was to inject the barrier above the pyritic layer to (a) stop infiltration of …
Acid Sulphate Soil Remediation Techniques On The Shoalhaven River Floodplain, Australia, Buddhima Indraratna, A. N. Golab, W. Glamore, B. Blunden
Acid Sulphate Soil Remediation Techniques On The Shoalhaven River Floodplain, Australia, Buddhima Indraratna, A. N. Golab, W. Glamore, B. Blunden
Faculty of Engineering - Papers (Archive)
A commonly used flood mitigation technique in coastal areas of Australia during the late 1960’s was the installation of one-way floodgates on flood mitigation drains. In regions affected by acid sulphate soils (the oxidation of pyrite in the soil forms sulphuric acid), the floodgates prevent tidal carbonate/bicarbonate buffering of the drains and thereby create reservoirs of acidic water (pH < 4.5) that discharge during low tide. Several acid sulphate soil remediation techniques have been used in coastal lowland in southeastern NSW, Australia. Following extensive monitoring and finite element modelling of groundwater conditions and quality, fixed level v-notch weirs were installed at three elevations to maintain elevated groundwater levels. The weirs successfully maintained the groundwater level above the acid sulphate soils, preventing additional pyrite oxidation, and reduced the rate of discharge of acid to the drain. Following further monitoring, investigation into anaerobic acid sources, and finite element based geochemical modelling, modified two-way floodgates that allow tidal ingress were installed. The modified floodgates were successful in buffering the drain water pH before discharging the drain water into adjacent waterways. Numerical analysis based on FEM was extended to illustrate that saline intrusion into the surrounding soil (as a result of tidal ingress and acid buffering in the drains) was not a major concern for the pastureland or other agricultural activities
Selection Of Potential Reactive Materials For A Permeable Reactive Barrier For Remediating Acidic Groundwater In Acid Sulphate Soil Terrains, A. N. Golab, M. A. Peterson, Buddhima Indraratna
Selection Of Potential Reactive Materials For A Permeable Reactive Barrier For Remediating Acidic Groundwater In Acid Sulphate Soil Terrains, A. N. Golab, M. A. Peterson, Buddhima Indraratna
Faculty of Engineering - Papers (Archive)
A permeable reactive barrier is being designed to remediate leachate from acid sulphate soils. The current research relates to testing of alkaline materials for use in the barrier, with an emphasis on waste materials. Thirteen alkaline materials including recycled concrete, limestone, calcite-bearing zeolitic breccia, blast furnace slag, lime and fly ash were tested. The batch tests involved several phases, such as leaching in deionised water to characterise the soluble components of the materials and the pH that each material could achieve. Another phase involved testing with acidic water (pH 3) to determine the acid leachable components of the materials and …