A post-combustion carbon capture system is configured to remove carbon dioxide from a post-combustion feed stream. The post-combustion carbon capture system includes an absorption tower that is configured to produce clean gas with a reduced carbon dioxide concentration and loaded solvent from the post-combustion feed stream. The post-combustion carbon capture system further includes a stripper tower downstream from the absorption tower, and an ultrasonic degasification module configured to remove oxygen from the loaded solvent. In another embodiment, the ultrasonic degasification module is incorporated into a biogas processing system and configured to remove oxygen from a carbon dioxide-loaded solvent.