Potential biogeochemical impacts of heat rejection in the Mullaloo aquifer, Western Australia. (January 2015)

• Record Type: Journal Article
• Authors: Douglas, G.B.; Trefry, M.G.; Wylie, J.T.; Wilkes, P.G.; Puzon, G.J.; Kaksonen, A.H.
• Is Part Of: Geothermics. Volume 53(2015:Jan.)
• Page Start: 429
• Page End: 445
• Publication Date: 2015-01
• Subjects: Heat rejection -- Groundwater -- Biogeochemical protocol -- Geochemistry -- Microbiology -- Modelling; Hydrogeology -- Periodicals; Geothermal resources -- Periodicals; Énergie géothermique -- Périodiques; GEOTHERMAL ENGINEERING; GEOTHERMAL ENERGY; GEOTHERMAL EXPLORATION; Geothermal resources; Hydrogeology; Periodicals; Electronic journals; 621.44
• DOI: 10.1016/j.geothermics.2014.08.004
• Languages: English
• ISSNs: 0375-6505

Abstract

Highlights: Heated groundwater biogeochemical assessment protocol developed. Based on a multidisciplinary study of aquifer/groundwater chemistry and microbiology. Regular monitoring required to assess system performance and environmental impact. Abstract: A rapid biogeochemical assessment protocol has been developed to assess the potential effects of returning heated groundwater to the Mullaloo aquifer in Perth, Western Australia. A multi-disciplinary study encompassed geochemical analysis of the aquifer sediment, and microbiological, organic contaminant and major ion surveys of the groundwater. Geochemical modelling indicates few, if any adverse implications of a proposed 10 °C temperature increase. A potential exists for chemical and biological clogging but this will be minimised by a closed loop design to avoid the introduction of atmospheric oxygen. Nevertheless, the need for regular monitoring of scheme performance and environmental impacts remains.