AI Article Synopsis
- Carbon dioxide (CO2) Capture and Storage (CCS) aims to reduce atmospheric CO2 by storing it in geological formations, but offshore storage poses risks of leaks that could acidify marine environments.
- Changes in pH, either from CO2 leaks or other human and natural activities, can mobilize harmful trace elements from sediment, affecting water quality.
- The study develops a model to predict how different acidification conditions influence the release of metals from sediments and highlights that even slight acidification can significantly impact aquatic ecosystems.
Article Abstract
Carbon dioxide (CO) Capture and Storage (CCS) is a technology to reduce the emissions of this gas to the atmosphere by sequestering it in geological formations. In the case of offshore storage, unexpected CO leakages will acidify the marine environment. Reductions of the pH might be also caused by anthropogenic activities or natural events such as acid spills and dredging operations or storms and floods. Changes in the pH of the marine environment will trigger the mobilisation of elements trapped in contaminated shallow sediments with unclear redox boundary. Trace element (As, Cd, Cr, Cu, Ni, Pb and Zn) release from anoxic and oxic estuarine sediment is analysed and modelled under different laboratory acidification conditions using HNO (l) and CO (g): acidification at pH = 6.5 as worst-case scenario in events of CO leakages and acid spills, and acidification at pH = 7.0 as a seawater scenario under CO leakages, acid spills, as well as sediment resuspension. The prediction of metal leaching behaviour appear to require sediment specific and site specific tools. In the present work it is demonstrated that the proposed three in-series reactions model predicts the process kinetics of the studied elements under different simulated environmental conditions (oxidation levels and acid sources). Differences between HNO and CO acidification are analysed through the influence of the CO gas on the ionic competition of the medium. The acidification with CO provokes higher released concentrations from the oxic sediment than from the anoxic sediment, except in the case of Zn, which influences the release of the other studied elements. Slight acidification can endanger the aquatic environment through an important mobilisation of contaminants. The obtained prediction of the contaminant release from sediment (kinetic parameters and maximum concentrations) can contribute to the exposure assessment stage for risk management and preincidental planning in accidental CO leakages and chemical spills scenarios.
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| http://dx.doi.org/10.1016/j.jenvman.2017.05.044 | DOI Listing |
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