Which condition is favorable for increasing the rates of corrosion in cooling towers?

High dissolved oxygen levels are indeed favorable for increasing the rates of corrosion in cooling towers. When oxygen is dissolved in water, it can react with metal surfaces, leading to oxidation processes that contribute to corrosion. This is particularly significant in cooling water systems because the oxygen can accelerate the rusting of metals used in the construction of cooling tower components, such as steel.

Moreover, the presence of oxygen in conjunction with moisture creates an ideal environment for microbial growth and can lead to the formation of biofilms, which may further exacerbate corrosion issues.

In contrast, low water temperatures tend to reduce corrosion rates, as chemical reactions, including those involved in corrosion, generally proceed more slowly at lower temperatures. High mineral content can lead to scaling rather than direct corrosion, as minerals often precipitate out and form protective layers on metal surfaces. Reduced airflow can impact the evaporation rates and heat exchange efficiency of cooling towers, but it may not directly influence corrosion rates as significantly as dissolved oxygen levels.