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The Warruwi community on South Goulburn Island relies for its water supplies on a shallow laterite aquifer which has limited capacity to provide water through the long dry seasons. This paper explores the emerging results from the first 12 months of a trial to bank water from the surficial aquifer during the wet season in a deeper aquifer to expand dry season water supplies through Aquifer Storage and Recovery (ASR). The injection of fresh, oxygenated, low pH water into a brackish sandstone aquifer known to contain pyrite required investigation of the potential for clogging of the injection well, geochemical and microbiological effects on the quality of the water recovered, and the mixing of fresh injected with brackish groundwater currently occupying the storage zone. The injection of 28.2 ML of water and recovery of 1.4 ML produced useful data suggesting that a) clogging by iron oxyhydroxides and possibly biofilms occurs, and a dedicated pump is required for regular backwashing, b) the quality of recovered water is likely to meet drinking water requirements following post treatment by aeration, and c) recovery efficiencies may be as high as 75% in the first cycle and increase further in subsequent cycles.
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