Details

Autor(en) / Beteiligte

• Xiao, Ting
• Tu, Jiawei
• Wang, Bonan
• Esser, Richard
• Bailey, Tessa
• Cather, Martha
• Tian, Hailong
• McPherson, Brian

Titel

Chemical impacts of subsurface CO2 and brine on shallow groundwater quality

Ist Teil von

• Chemosphere (Oxford), 2023-04, Vol.321, p.138048-138048, Article 138048

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Leakage from geologic CO2 sequestration (GCS) sites to overlying shallow drinking water aquifers is a tangible risk. A primary purpose of this study is to assess the potential impacts of CO2 leakage into a fresh-water aquifer with associated CO2-water-sediment interactions. The study site is the Ogallala aquifer overlying an active demonstration-scale GCS site in north Texas, USA. Using the results of combined batch experiments and reactive transport simulations, we discuss the effects of salinity on potential trace metal release and the potential for groundwater quality recovery after leakage ceases. suggest that trace metals are released from sediment due to impure carbonate mineral dissolution and cation exchange with exposure to aqueous CO2. Concentrations of Mn, Zn and Sr might exceed the U.S. Environmental Protection Agency's (EPA) limits. After CO2 leakage stops, most cation concentrations decrease to levels observed before leakage quickly, suggesting that water quality may not be a long-term concern. However, saline water that co-leaks with CO2 may increase salinity of a shallow aquifer and induce more trace metals release from the sediment. In most cases, pH is sensitive to even small increases of CO2, suggesting that pH may be a sufficiently sensitive parameter for detecting CO2 leakage. [Display omitted] •CO2-water-sediment interactions in the largest aquifer in the USA was assessed.•Increased water salinity further induces trace metal release from the sediment.•Shallow groundwater quality may recover after the cease of CO2 leakage.•PH is highly sensitive to CO2 fraction change and suggested as a leakage indicator.