Environmental risk assessment of formaldehyde emission from amines-based post-combustioncarbon capture projects

Post combustion capture (PCC) of CO₂ using amine solvent scrubbing is the most mature technology which could be used for existing power stations. PCC technology has the potential to emit toxic organic compounds whose environmental and health impacts must be assessed prior to regulatory approval. In this study a probabilistic risk assessment for inhalation exposure to formaldehyde has been performed in the upper Hunter area with and without PCC technology fitted to an existing power station. The assessment consisted of background measurements of formaldehyde, modelled concentrations using the TAPM model of power station emissions, and Monte Carlo simulations of risk probabilities based on the modelled concentrations. The results show that cancer risk due to formaldehyde after installing post-combustion capture technology does not cause large increases in the whole area but a small increase near the emission source. The risk probabilities are well below the USEPA level of concern where action to reduce exposure is required.