3M Membrane Filtration (formerly Membrana)

TB 15: Deoxygenated Make-Up Water in Power Plant Using Liqui-Cel® Contactors


Courtesy of Courtesy of 3M Membrane Filtration (formerly Membrana)

Corrosion control in piping, boilers, and associated equipment is an important issue with power generation facilities. The presence of dissolved oxygen in process waters coming into contact with this equipment is one of the major sources of corrosion. In order to minimize this corrosion source, power generation plants remove virtually all dissolved oxygen in process water. Typically as raw make-up water enters the plant, it flows through various treating steps including mechanical and/or chemical means to remove dissolved oxygen. This treated make-up water is commonly held in a large storage tank of sufficient capacity and design to handle variations in the power facility’s needs.

Often these storage tanks are vented to the atmosphere. One major drawback to a vented storage tank is that it allows oxygen from the atmosphere to come into contact with deoxygenated water stored in the tank. Therefore water exiting the tank will show increased levels of dissolved oxygen as compared to that of the incoming water. Depending on the length of time that the water is in the tank, exit dissolved oxygen concentrations can become quite high.

DI Water Storage


A deionized (DI) water storage tank as described above is used at a nuclear power generation site in the United States. As a result, dissolved oxygen concentration in the plant make-up water was above specification.

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