Evaluation through column leaching tests of metal release from contaminated estuarine sediment subject to CO2 leakages from Carbon Capture and Storage sites

• Published in: Environmental pollution (1987) Vol. 171; pp. 174 - 184
• Main Authors: Payán, M. Cruz, Galan, Berta, Coz, Alberto, Vandecasteele, Carlo, Viguri, Javier R.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.12.2012; Elsevier
• Subjects: acidification; analysis; Applied sciences; arsenic; Biological and physicochemical properties of pollutants. Interaction in the soil; cadmium; carbon; carbon dioxide; Carbon Dioxide - analysis; Carbon Dioxide - chemistry; Carbon Sequestration; chemistry; chromium; climate change; Climatology. Bioclimatology. Climate change; CO2 leakage; CO2-acidified seawater; Column leaching tests; copper; dissolved organic carbon; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Environmental Monitoring; Estuaries; Exact sciences and technology; External geophysics; Geologic Sediments; Geologic Sediments - chemistry; Hydrogen-Ion Concentration; leaching; lead; Metal release; Metals; Metals - analysis; Metals - chemistry; Meteorology; Models, Chemical; neutralization; nickel; Pollution; Pollution, environment geology; Risk Assessment; seawater; Seawater - chemistry; Sediment; sediments; Soil and sediments pollution; Spain; Water Pollutants, Chemical; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - chemistry; zinc; Spain; CO2 leakage; Sediment; CO2-acidified seawater; Column leaching tests; Metal release; heavy metals; Carbon dioxide; acidification; greenhouse gas; environment impact; trace elements; lixiviation; estuaries; acidified seawater; climate change; sea water; Sediment water interaction; Pollutant behavior; CO2 sequestration; Geological formation; arsenic; CO; Carbon sequestration; sustainable development; Mitigation; Carcinogen; Geoengineering; Poison; leakage
• ISSN: 0269-7491; 1873-6424; 1873-6424
• DOI: 10.1016/j.envpol.2012.07.029

The pH change and the release of organic matter and metals from sediment, due to the potential CO2 acidified seawater leakages from a CCS (Carbon Capture and Storage) site are presented. Column leaching test is used to simulate a scenario where a flow of acidified seawater is in contact with recent contaminated sediment. The behavior of pH, dissolved organic carbon (DOC) and metals As, Cd, Cr, Cu, Ni, Pb, Zn, with liquid to solid (L/S) ratio and pH is analyzed. A stepwise strategy using empirical expressions and a geochemical model was conducted to fit experimental release concentrations. Despite the neutralization capacity of the seawater-carbonate rich sediment system, important acidification and releases are expected at local scale at lower pH. The obtained results would be relevant as a line of evidence input of CCS risk assessment, in an International context where strategies to mitigate the climate change would be applied. ► Tier structured approach for assessment of the release of metals from sediment. ► Standard column leaching test to simulate CO2 acidified seawater CCS leakages. ► Metal and DOC release from marine sediment in contact to CO2 acidified seawater. ► From empirical to geochemical modeling approaches of DOC and metals release in column tests. ► Contamination line of evidence input of CCS risk assessment. Column metal release from CO2 acidified seawater leakages in contact with estuarine contaminated sediment in CCS sites