What is a common method to remove dissolved oxygen from feedwater?

De-aeration is a common and effective method for removing dissolved oxygen from feedwater. This process typically involves heating the water and reducing pressure in a de-aerator tank. When the temperature of the water is increased, the solubility of gases in the water decreases, allowing the dissolved oxygen to escape into the atmosphere. Additionally, the reduction of pressure within the system aids in releasing any gases that are dissolved in the water more efficiently.

This method is particularly important in steam generation systems, where the presence of dissolved oxygen can lead to corrosion of metal surfaces, adversely affecting the longevity and performance of the equipment. By minimizing oxygen levels, de-aeration helps ensure the reliability of the system and improves overall efficiency.

While other methods, such as filtration or chlorination, can address certain water quality concerns, they do not specifically target the removal of dissolved oxygen in the same effective manner as de-aeration does. Chlorination, for example, is primarily used for disinfection and may introduce additional variables that need to be managed in the treatment process.