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

详细信息    查看全文

• 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 (CO₂), raising concerns that injected CO₂ will leak into overlying freshwater aquifers. While a high concentration of CO₂ is toxic to bacteria and causes large community changes, little is known about how exposure to low concentrations of CO₂ 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 CO_2(aq) exposure on the microbial community in a freshwater aquifer was examined. CO_2(aq) 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 CO_2(aq) up to 1.53 g of CO_2(aq)/L, but diversity decreased with an increased CO_2(aq) concentration, suggesting at least short-term disruption of ecosystem functions may occur.