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Biological and chemical treatment technologies for waste amines from CO2 capture plants

Ghayur, Adeel, Verheyen, T. Vincent, Meuleman, Erik
Journal of environmental management 2019 v.241 pp. 514-524
amines, carbon dioxide, chemical treatment, commercialization, flue gas, greenhouse gas emissions, industrial applications, nitrogen oxides, power plants, wastes
Amine-based carbon dioxide capture is the most mature technology for reducing flue gas CO2 emissions. It has been postulated and observed during commercialisation of this technology that significant quantities of waste amines are produced. Further industrial implementation of this technology requires adequate disposal or valorisation options for this waste. This review presents an analysis of seven biological and chemical technologies for waste amine amelioration or valorisation. Of these, the biological treatments are identified as being more mature for industrial application with the capacity for marketable product generation. Slow speed is the main drawback of the biological processes but this does not hinder their commercial viability. Using waste amine for NOx reduction in power stations is a secondary option, where it seems probable that the amount of waste amine generated in the CO2 capture plant is sufficient to fulfil the DeNOx requirements of the flue gas. This route, however, requires investigation into the impact of waste amine impurities on the power station and the CO2 capture plant operations.