Simulation of the potential effects of CO2 leakage from carbon capture and storage activities on the mobilization and speciation of metals

被引:21
作者
Romano de Orte, Manoela [1 ]
Sarmiento, Aguasanta M. [2 ]
Angel DelValls, T. [1 ]
Riba, Inmaculada [1 ]
机构
[1] Univ Cadiz, Dept Quim Fis, Catedra UNESCO UNITWIN WiCop, Cadiz 11510, Spain
[2] Univ Huelva, Dept Geodinam & Paleontol, Huelva 21071, Spain
关键词
Carbon capture and storage (CCS); Metal mobility; Speciation; Contamination; Acidification; Risk; AZNALCOLLAR MINING SPILL; GUADALQUIVIR ESTUARY; HEAVY-METALS; IRON-OXIDE; ACID; ACIDIFICATION; MOBILITY; DISSOCIATION; ADSORPTION; SEDIMENTS;
D O I
10.1016/j.marpolbul.2014.07.042
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
One of the main risks associated with carbon capture and storage (CCS) activities is the leakage of the stored CO2, which can result in several effects on the ecosystem. Laboratory-scale experiments were performed to provide data on the possible effects of CO2 leakage from CCS on the mobility of metals previously trapped in sediments. Metal-contaminated sediments were collected and submitted to acidification by means of CO2 injection using different pH treatments. The test lasted 10 days, and samples were collected at the beginning and at the end of the experiment for metal analysis. The results revealed increases in the mobility of metals such as Co, Cu, Fe, Pb and Zn due to pH decreases. Geochemical modeling demonstrated that acidification influenced the speciation of the metals, increasing the concentrations of their free forms. These data suggest the possible sediment contamination consequences of accidental CO2 leakage during CCS activities. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:59 / 67
页数:9
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