Effect of CO2(aq) Exposure on a Freshwater Aquifer Microbial Community from Simulated Geologic Carbon Storage Leakage

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• 作者：Djuna M. Gulliver ; Gregory V. Lowry ; Kelvin B. Gregory
• 刊名：Environmental Science & Technology Letters
• 出版年：2014
• 出版时间：December 9, 2014
• 年：2014
• 卷：1
• 期：12
• 页码：479-483
• 全文大小：275K

文摘

Geological carbon storage is likely to be part of a comprehensive strategy to minimize the atmospheric release of carbon dioxide (COb>2b>), raising concerns that injected COb>2b> will leak into overlying freshwater aquifers. While a high concentration of COb>2b> is toxic to bacteria and causes large community changes, little is known about how exposure to low concentrations of COb>2b> may impact bacterial communities in aquifers. Microbial communities in aquifers provide important functionality through carbon and nutrient cycling in aquifer and connected aqueous ecosystems. The impact of in situ COb>2(aq)b> exposure on the microbial community in a freshwater aquifer was examined. COb>2(aq)b> was introduced into the formation to simulate leakage from a geologic carbon storage unit. On the basis of the 16S rRNA genes recovered from subsurface samples, the population numbers were unaffected by COb>2(aq)b> up to 1.53 g of COb>2(aq)b>/L, but diversity decreased with an increased COb>2(aq)b> concentration, suggesting at least short-term disruption of ecosystem functions may occur.