Authors / CoAuthors
Page, D. | Vanderzalm, J. | Miotlinski, K. | Barry, K. | Dillon, P
Abstract
Internationally, problems with Aquifer Storage and Recovery (ASR) schemes are commonly attributed to inadequate characterisation of the hydrogeological system and a failure to predict aquifer clogging potential. ASR success relies on defining appropriate design and operational parameters in order to maintain high injection and recovery rates over the long term. The objective of this study was to determine the potential for near-well clogging for a proposed ASR scheme in the Darling Floodplain near Menindee, N.S.W. A methodology was developed to define the water quality criteria and hence minimum pre-treatment requirements to allow long-term ASR operation. Laboratory column studies using four types of treated source water were performed at constant temperature (19C) with light excluded. The source water was turbid raw water from the Darling River and three treated waters including bank filtration, coagulation, and coagulation and granular activated carbon (GAC). Over the 37 days of the experiment, declines in hydraulic conductivity occurred in the columns packed with representative aquifer fluvial sands. The GAC treated town water gave an 8% decline in hydraulic conductivity, which was significantly different from the other three source waters with mean declines of 26-29%. Over the first 3 cm of column length, where most clogging occurred in each column, the mean hydraulic conductivity declined by 10% for GAC treated water compared with 40 to 50% for the other source waters. Polysaccharide concentrations and bacterial numbers in columns when they were dissected and analysed at the end of the experiment confirmed that biological growth was the dominant form of clogging in the treated waters. Further, chemical clogging through precipitation of minerals was found not to occur within the laboratory columns, and dispersion of clay was also found to be negligible. While the laboratory column studies provided useful indicative data on clogging potential, sample preparation required disaggregation and re-packing of aquifer materials. This creates additional uncertainty in the transferability/scaling of changes in hydraulic conductivities (and clogging potential) from the laboratory to the in situ aquifer scale. Future column experiments should be carried out on 'undisturbed' representative core materials.
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nonGeographicDataset
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75760
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- External PublicationAbstract
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Geology
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- Published_Internal
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2013-01-01T00:00:00
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Abstract prepared for submission to the International Association of Hydrogeologists (IAH).
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