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Assessment of HYD
Published in Reza Javaherdashti, Farzaneh Akvan, Hydrostatic Testing, Corrosion, and Microbiologically Influenced Corrosion, 2017
Reza Javaherdashti, Farzaneh Akvan
Oxygen reduction is an inevitable part of any electrochemical corrosion process that takes place under aerobic conditions, so finding a way to exclude oxygen is a key factor in controlling corrosion. For this reason, certain chemicals (such as bisulfites) are added into HYD water. Examples of oxygen scavengers include ammonium, amines, and sodium biosulfite. In a typical dosage of oxygen scavenger, for each part of oxygen present, eight to ten parts of biosulfite will be necessary to exclude cathodic oxygen. There is, however, an important issue to consider regarding the application of oxygen scavengers when the pipe is made of carbon steel, in that there is the possibility of an interaction between oxygen and the pipe wall. This is described in Kochelek [11].
Selection of Catalysts for Use in a Heterogeneous Catalytic Ozonation System
Published in Ozone: Science & Engineering, 2020
Edison Alexander Agudelo, Santiago Alonso Cardona G.
Scavenger compounds, such as carbonate and bicarbonate ions, are found in almost all sewage and natural water systems. Therefore, determining the effect of scavenger compounds on the catalysts’ effectiveness is extremely important to the recommendation of the material for commercial use. The above result shows that the mixture of activated carbon and Portland cement into a single catalyst minimizes the effect of “scavengers” in the solution, meaning that the efficiency of the process is increased. The results also show that the hydroxyl radicals generated in this type of system occur mainly on the surface of the catalyst since the removal rate is similar, whether, or not, “scavenger” compounds are present.