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Permeable Reactive Barrier (Prb) Technology: An Innovative Solution For The Remediation Of Acidic Groundwater From Acid Sulphate Soil (Ass) Terrain, Laura Banasiak, Buddhima Indraratna
Permeable Reactive Barrier (Prb) Technology: An Innovative Solution For The Remediation Of Acidic Groundwater From Acid Sulphate Soil (Ass) Terrain, Laura Banasiak, Buddhima Indraratna
Buddhima Indraratna
The remediation of acidic groundwater contaminated with potentially toxic metals such as aluminium (Al) and iron (Fe) resulting from the oxidation of sulphidic materials in acid sulphate soils (ASSs) is a challenging geo-environmental problem that requires innovative engineering solutions. In low-lying coastal floodplains, the remediation strategies of groundwater manipulation (e.g. fixed-level weirs) and tidal buffering (e.g. two-way modified floodgates) are not feasible due to the risk of flooding during heavy rainfall events and their inability to prevent pyritic oxidation. In view of this in 2006, the first pilot subsurface permeable reactive barrier (PRB) using recycled concrete for the remediation of …
Permeable Reactive Barrier (Prb) Technology For The Remediation Of Acidic Groundwater From Acid Sulphate Soil Floodplain In South East New South Wales, L J. Banasiak, B Indraratna, A. Golab
Permeable Reactive Barrier (Prb) Technology For The Remediation Of Acidic Groundwater From Acid Sulphate Soil Floodplain In South East New South Wales, L J. Banasiak, B Indraratna, A. Golab
Buddhima Indraratna
The release of acidic water contaminated with toxic metals such as aluminium (Al) and iron (Fe) resulting from pyrite oxidation within acid sulphate soils (ASSs) is a major environmental issue in Australia. Groundwater manipulation using weirs and modified floodgates is not effective in low-lying floodplains due to the high risk of flooding and their inability to prevent pyrite oxidation. Permeable reactive barrier (PRB) technology has been looked at as an alternative remediation technique in ASS terrain. Batch and short-term column tests were used to choose a suitable reactive material for the remediation of acidic water and the removal of Al …
Key Strategies For Managing Acid Sulphate Soil (Ass) Problems On The Southeastern Coast Of New South Wales, Australia, L J. Banasiak, B Indraratna
Key Strategies For Managing Acid Sulphate Soil (Ass) Problems On The Southeastern Coast Of New South Wales, Australia, L J. Banasiak, B Indraratna
Buddhima Indraratna
The acidification of Australian coastal waterways as a result of the oxidation of acid sulphate soil (ASS) containing appreciable quantities of sulphidic material (e.g. pyrite) has well recognised environmental, economic and social effects including the loss of fish, biodiversity and agricultural productivity as well as the corrosion of concrete and steel infrastructure by acidic drainage. Largescale artificial drainage and one-way floodgates in low-lying coastal floodplains has lowered the groundwater table, thus enhancing pyritic oxidation and increasing the distribution, magnitude and frequency of acid generation and release of toxic metals such as aluminium (Al3+) and iron (total Fe) from ASS. Engineering …
Long-Term Performance Of A Permeable Reactive Barrier In Acid Sulphate Soil Terrain, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem
Long-Term Performance Of A Permeable Reactive Barrier In Acid Sulphate Soil Terrain, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem
Buddhima Indraratna
Deep drainage technique utilised for flood mitigation in low-land coastal areas of Australia during the late 1960s has resulted in the generation of sulphuric acid in soil by the oxidation of pyritic materials. Further degradation of the subsurface environment with widespread contamination of the underlying soil and groundwater presents a major and challenging environmental issue in acid sulphate soil (ASS) terrains. Although several ASS remediation techniques recently implemented in the floodplain of Southeast Australia including operation of gates, tidal buffering and lime injections could significantly control the pyrite oxidation, they could not improve the long-term water quality. More recently, permeable …
Geo-Environmental Approaches For The Remediation Of Acid Sulphate Soil In Low-Lying Floodplains, Buddhima Indraratna, Gyanendra Regmi, Long Nghiem, Alexandra N. Golab
Geo-Environmental Approaches For The Remediation Of Acid Sulphate Soil In Low-Lying Floodplains, Buddhima Indraratna, Gyanendra Regmi, Long Nghiem, Alexandra N. Golab
Buddhima Indraratna
Acidity generated from the oxidation of pyrite and other sulphidic compounds that exist at shallow depths in acid sulphate soils (ASS) presents a challenging environmental problem in coastal Australia. The generated acidic groundwater can adversely impact coastal ecosystems, aquaculture and agriculture. Groundwater manipulation using weirs and modified floodgates in creeks and flood mitigation drains in ASS-affected farmland, which has been practiced for over a decade for preventing pyrite oxidation, is not effective in low-lying floodplains due to the high risk of flooding. In this paper, the authors present an overview of their experience in coastal Australia, a critical evaluation of …
Occurrence And Consequences Of Acid Sulphate Soils And Methods Of Site Remediation, Alexandra N. Golab, Buddhima Indraratna
Occurrence And Consequences Of Acid Sulphate Soils And Methods Of Site Remediation, Alexandra N. Golab, Buddhima Indraratna
Buddhima Indraratna
The oxidation of sulphides in acid sulphate soils (ASS) causes the acidification of many Australian coastal river systems. The acidity negatively impacts upon coastal ecosystems, aquaculture, agriculture and concrete and steel infrastructure. In the low-lying floodplains, relatively deep surface drains fitted with one-way floodgates lower the watertable, thereby exposing the sulphidic minerals to oxidation. On the Broughton Creek floodplain in SE Australia, four distinct remediation strategies have been developed to tackle the issue of acidification by ASS: (i) simple V-notch weirs that raise the level of the watertable surrounding the drains thereby submerging the pyrite and preventing the further formation …
Evaluating Waste Concrete For The Treatment Of Acid Sulphate Soil Groundwater From Coastal Floodplains, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, Laura Banasiak
Evaluating Waste Concrete For The Treatment Of Acid Sulphate Soil Groundwater From Coastal Floodplains, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, Laura Banasiak
Buddhima Indraratna
The treatment of acidic groundwater generated from acid sulphate soil (ASS) terrain is a challenging environmental issue in coastal floodplains of Australia. In this study, a laboratory column experiment was conducted to assess the performance of waste concrete for treating the acidic groundwater leachate from ASS terrain of the Shoalhaven region of NSW. The groundwater was highly acidic (pH of 2.5–3.5) and contained elevated concentrations of iron (10–90 mg/L) and aluminium (30–45 mg/L). Passage of the acidic groundwater through the column filled with waste concrete resulted in a significant improvement in water quality. Reduction in the concentration of iron and …
Effective Remediation Of Groundwater In Acid Sulphate Soil Terrain, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem
Effective Remediation Of Groundwater In Acid Sulphate Soil Terrain, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem
Buddhima Indraratna
Acidic groundwater, generated from acid sulphate soil (ASS) is a major geo-environmental problem in Australia. Manipulation of groundwater through the use of weirs and gates in the nearby creeks and drains of ASS, which is being practised right now for preventing pyrite oxidation, are not effective in low land floodplains due to the risk of flooding. The application of permeable reactive barrier (PRB) can be a novel alternative for remediation of acidic groundwater in such floodplains. Laboratory column experiments were carried out prior to installation of the PRB for examining the efficiency of the material. Results of these experiments have …
The Impact Of Floodgate Modifications On Water Quality In Acid Sulphate Soil Terrains, William Glamore, Buddhima Indraratna
The Impact Of Floodgate Modifications On Water Quality In Acid Sulphate Soil Terrains, William Glamore, Buddhima Indraratna
Buddhima Indraratna
The installation of one-way tidal restricting floodgates in regions containing acid sulphate soils has increased the problems associated with acid drainage in many areas of coastal Australia. In southeastern NSW, one-way flap gates installed in deep flood mitigation drains maintain a low groundwater table and increase acid production and transport. Moreover, by restricting the intrusion of brackish water into the drainage system, the floodgates create a reservoir of acidic water. Recent studies suggest that by allowing a controlled amount of brackish water into the drains, via modified floodgates, buffering agents can neutralize the acidic water. A fifteen-month study was undertaken …