How to choose the anti-corrosion methods for wastewater treatment equipment, pipelines, and tanks?
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This post was last edited by cdpulin on 10/17/2011 at 12:27. I work in the design of wastewater treatment processes; wastewater varies greatly in nature, and its corrosiveness also differs. How should one choose the anti-corrosion methods for wastewater treatment equipment, pipes, and tanks? What I would like to ask is: 1. Are there any books or standards that discuss anti-corrosion measures, providing information on anti-corrosion techniques suitable for various water qualities? 2. How should equipment and pools with high chloride ion levels be protected against corrosion, and how about those affected by sulfates? 3. How to prevent corrosion in cases where organic solvents such as amines, which can dissolve asphalt, are used? 4. It contains acids and particles; how should corrosion and wear resistance be ensured? 5. How should equipment and pipelines for concentrated sulfuric acid be selected and protected against corrosion? 6. How should anti-corrosion measures and materials be selected for equipment and pipelines using dilute sulfuric acid? 7. How should preservatives and materials be selected for sodium hypochlorite solutions? 8. How should anti-corrosion materials be selected for lime milk and liquid caustic? 9. For internal anti-corrosion measures in equipment such as rubber lining, what type of rubber should be used, what thickness is appropriate, and how is this determined? 10. How should preservatives and materials be selected for hydrogen peroxide? 11. After reaching the equalization tank, the process enters the biochemical stage. The pH is generally neutral. How should anti-corrosion measures be taken in anaerobic conditions? Is anti-corrosion necessary in aerobic conditions? Is it needed in the secondary sedimentation tank as well? What should be done if chloride levels are high? I started this topic mainly to discuss how to prevent corrosion in the equipment, pipelines, tanks, and structures used for various types of wastewater. Everyone is welcome to share their engineering experience; additionally, you can recommend books or standards, or just write down their names. Thank you!
In fact, in wastewater treatment, unless otherwise specified, when the concentration of certain ions in the wastewater is only a few thousand PPM, such as chloride or sulfate ions, no special anti-corrosion measures are required. This is because these corrosive ions have different effects on various materials; for example, chloride ions have a significant corrosive effect on stainless steel, but little effect on carbon steel. If there are special items that require anti-corrosion treatment, then one should refer to the specialty of \"Anti-Corrosion Engineering\".
Hello, original poster. I work in the BD department for water treatment solutions at a large paint company, and what you mentioned falls within our area of expertise. Feel free to get in touch with me to discuss this further :- ) 1893012-5670, Li
Chemical wastewater treatment involves not only acids and bases but also organic solvents in certain concentrations. The flexible ceramic coatings developed by Zhanpin Technology are resistant to both strong acids and bases as well as organic solvents. Some chemical manufacturing companies have begun to adopt this solution; for more information, please contact Wang at 18986084757
You can refer to the corrosion prevention data manual, which provides comprehensive information on the concentration and temperature limits that various corrosion-resistant materials can withstand; the ISO12944 standard can also be used as a reference
For anti-corrosion in anaerobic environments, 881 is commonly used. There are various materials used for anti-corrosion in biochemical tanks and related combined water tanks (such as glass flake coatings), and these are usually specified in the standard civil engineering drawings. For the chemical addition pipelines, there are now PUC materials of chemical grade available, suitable for adding both acids and alkalis ；
Corrosion prevention may seem like a minor issue, but in reality it is a major one.
I recommend a polyaniline anti-corrosion coating with good cost-performance