A comparison of the geochemical response to different managed aquifer recharge operations for injection of urban stormwater in a carbonate aquifer |
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| Authors: | JL Vanderzalm DW PageKE Barry PJ Dillon |
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| Institution: | CSIRO Land and Water, Water for a Healthy Country Research Flagship, Waite Laboratories, Waite Rd, Urrbrae, South Australia 5064, Australia |
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| Abstract: | Managed aquifer recharge (MAR) is increasingly being considered as a means of reusing urban stormwater and wastewater to supplement the available water resources. Subsurface storage is advantageous as it does not impact on the area available for urban development, while the aquifer also provides natural treatment. However, subsurface storage can also have deleterious effects on the recovered water quality through water–rock interactions which can also impact on the integrity of the aquifer matrix. A recent investigation into the potential for stormwater recycling via Aquifer Storage Transfer and Recovery (ASTR) in a carbonate aquifer is used to determine the important hydrogeochemical processes that impact on the recovered water quality. An extensive period of aquifer flushing allows observation of water quality changes under two operating scenarios: (1) separate wells for injection and recovery, representing ASTR; and (2) a single well for injection and recovery, representing Aquifer Storage and Recovery (ASR). |
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