NDLI: Hydraulic evaluation of aquifer storage and recovery (ASR) with urban stormwater in a brackish limestone aquifer

Content Provider	Springer Nature Link
Author	Pavelic, Paul Dillon, Peter J. Barry, Karen E. Gerges, Nabil Z.
Copyright Year	2006
Abstract	A 5-year aquifer storage and recovery trial at Andrews Farm in South Australia involving the injection of more than 250 ML (250,000 m$^{3}$) of fresh but turbid stormwater into a brackish limestone aquifer over 4 years and recovery of 150 ML in the fifth provided the opportunity to evaluate rates of clogging and unclogging and the potential to recover water suitable for irrigation supplies. Results reveal there is some clogging by injected sediment, but only to a relatively small degree considering the high suspended solid concentrations and moderate aquifer transmissivity. This clogging was offset by increased matrix porosity through calcite dissolution and by routine well redevelopments after each 40 ML of injection. No significant microbial clogging occurred. Breakthrough responses at three observation wells and the proportion of injectant in the recovered water were determined from chloride data. Temperature and caliper profiles clearly indicate the heterogeneous nature of the aquifer that is attributed, in part, to sand removal during the initial well development. The recovery efficiency was greater than 60%. The trial demonstrates that urban stormwater containing high and variable particulate levels, which receives only passive pre-treatment and is not disinfected, can be used to freshen a heterogeneous brackish aquifer to create a useful water resource.Un essai d’injection et de récuperation a été réalisé sur cinq ans sur le site de la ferme Andrews dans le sud de l’Australie. Plus de 250 ML (250,000 m$^{3}$) d’eau pluviale d’orage, douce mais turbide, ont été injectés dans un aquifère calcaire saumâtre, sur une période de quatre ans, suivie d’une récupération de 150 ML la cinquième année. L’essai a permis d’évaluer les taux de colmatage et de décolmatage ainsi que la possibilité de disposer d’eau pouvant être utilisée pour l’irrigation. Les résultats montrent un colmatage par les sédiments injectés, cependant à un faible degré si on considère les concentrations élevées de matières en suspension et la transmissivité moyenne de l’aquifère. Ce colmatage était compensé par l’augmentation de la porosité de la matrice due à la dissolution du calcaire et par des développements réguliers de l’ouvrage après chaque injection de 40ML. Aucun colmatage microbien important n’a été observé. La réaction aux trois puits d’observation et le taux de dilution avec la nappe naturelle ont été déterminés grâce aux chlorures. Les profils de la température et du diamètre du puits montrent clairement la nature hétérogène de l’aquifère, laquelle s’explique en partie par un désensablement lors du développement initial de l’ouvrage. Le rendement de la récupération fut supérieure à 60%. L’essai démontre que de l’eau pluviale urbaine, présentant des niveaux élevés et variables de particules, après un traitement passif et non désaffectée, peut être utilisée pour adoucir un aquifère saumâtre hétérogène et constituer une importante ressource en eau.Una prueba de abastamiento y recuperación de cinco años en un acuífero en Andrews Farm en South Australia que involucró la inyección de más de 250 ML de agua pluvial fresca pero túrbida a un acuífero de caliza de agua salina por cuatro años y la recuperación de 150 ML en el quinto año proporciona la oportunidad de evaluar tasas de obstrucción y desobstrucciòn y el potencial de recuperar agua adecuada para irrigación. Los resultados revelan que hay alguna obstrucción por el sedimento inyectado, pero sólo en un grado menor, considerando las concentraciones altas de sólidos suspendidos y la transmisividad moderada del acuífero. Esta obstrucción se balanceó por un incremento en la porosidad de la matriz debido a la disolución de calcita y por el redesarrollo rutinario de pozos después de cada 40 ML de inyección. No ocurrió ninguna obstrucción de microbios importante durante la prueba. La respuesta de breakthrough en tres pozos de observación y la proporción de agua inyectada en el agua recuperada se determinó por los datos de cloro. Los perfiles de temperatura y caliper demuestran claramente la naturaleza heterogénea del acuífero, que se atribuye en parte a la arena extraída durante el desarrollo de pozos inicial. La eficacia de recuperación es mayor a 60%. La prueba demuestra que las aguas pluviales urbanas que contienen niveles de partículas altas y variables que reciben solamente pretratamiento pasivo y que no se desinfectan, pueden ser utilizadas para incrementar la frescura de un acuífero con agua salina heterogéneo para crear un recurso útil de agua.
Starting Page	1544
Ending Page	1555
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	14
Issue Number	8
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-10-21
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbonate rocks Clogging Recovery efficiency Urban groundwater Water banking Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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