The equipment cost estimates for the '1C: MEA' and '1C: Amino acid ' configurations are based on the work of Kiani et al. . For the '1C: MEA' configuration, Kiani et al. estimated that the water washing column and the absorber account for 73% of the capital cost. The '1C: Amino acid ' configuration does not require a washing section, which reduces its capital costs (see Figure ). The main cost driver for the '1C: Amino acid ' configuration is the blower and fans, at 46% of the total equipment cost. The second largest contributor is the absorber, which accounts for 20% of the equipment cost. However, Kiani et al. assumed cost reductions for the absorber for the application in DAC. If no cost reductions are applied (and a conventional absorber is used), then the absorber would have been the largest equipment cost, at 59% share.