TB 68: Chemical cost comparison lc vs. traditional deaeration system

Mixed bed ion exchange is often used to polish Reverse Osmosis (RO) permeate in many industrial water systems. This process has been utilized for several years and it is well known that the management of the dissolved Carbon
Dioxide (CO2) in the water is critical for an efficient operation. CO2 typically accounts for the largest anion
load in a DI system and it is normally handled using one of the following methods: Conventional degasifying unit, such as a Forced Draft Tower. Liqui-CelĀ® Membrane Contactors.

This technical brief compares the performance and operating costs of membrane contactors with conventional forced draft tower technology for CO2 removal. This brief will also show why membrane degassing is the economical and value added technology of choice for oxygen and carbon dioxide removal from water.

This comparison is based on an actual water system currently operating at a plant in China. The system consists of three 110 m3/hr lines each line consisting of an RO+Mixed Bed system. Due to high chemical (HCL and NaOH) regeneration costs the plant considered deaerating the water prior to the Mixed Bed.

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