Novel Pretreatment Oxygen Removal Technologies

All boiler operations utilize some form of basic chemical oxygen scavenging, and most larger facilities also employ mechanical deaeration prior to chemical polishing. Alternatives to these essentially independent techniques exist and have been steadily gaining in popularity for application in larger boiler plants and in other types of ultrapure water applications. 

Since the early 1980s a chemical-equipment combination technique has been available utilizing hydrazine and a catalytic carbon filter bed, and since the early 1990s gas transfer membranes have entered the market and proved to be particularly effective. 

1 Oxygen Removal Using Catalyzed Carbon Bed Technology 

Despite the potential carcinogenic nature of hydrazine, it is still widely employed as an oxygen scavenger and is effective at higher temper- 

The oxygen removal reaction using a carbon bed catalyst is as shown below  

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