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Identification & Mitigation of System Corrosion Nate Ver Heul - PowerPoint PPT Presentation

Jul 25, 2023 •236 likes •648 views

MWEA Lagoon Seminar February 21, 2013 Identification & Mitigation of System Corrosion Nate Ver Heul Definition corrosion [k uh -roh-zh uh n] noun The deterioration of a material or its properties because of a reaction with its

  1. MWEA Lagoon Seminar February 21, 2013 Identification & Mitigation of System Corrosion Nate Ver Heul

  2. Definition cor·ro·sion [k uh -roh-zh uh n] noun The deterioration of a material or its properties because of a reaction with its environment.

  3. Corrosion in Wastewater Systems • Bacterial • Electrochemical

  4. Bacterial (H 2 S) Corrosion

  5. Understanding…H 2 S Corrosion • Colorless, poisonous, flammable, explosive gas • Smells like rotten eggs • Desensitizer

  6. Understanding…H 2 S Corrosion Health and Safety Impact of H 2 S H 2 S Level (ppm) Health Effects 0.0005 Noticeable smell 0-10 Irritation of eyes, nose and throat 10 Exposure limit H 2 S >10 ppm = Headache, dizziness, nausea, difficulty 10-50 concern for breathing system integrity Severe respiratory irritation, convulsions, 50-200 coma and possibly death

  7. Understanding…H 2 S Corrosion • Sulfate is reduced to sulfide • Anaerobic digestion • Sulfide combines with Hydrogen to form H 2 S gas • H 2 S oxidates to Sulfuric Acid in presence of moisture

  8. Facultative Lagoon

  9. Understanding…H 2 S Corrosion

  10. Understanding…H 2 S Corrosion • How do sulfates get into collection systems? • Sulfur cycle • Corrosion on the rise • Less heavy metals • Less inflow and infiltration

  11. Identifying…H 2 S Corrosion • What it looks like/Potential signs • Blackened wastewater or sludge • Concrete • Cement is attacked – soft, easily crumbles • Reinforcing steel – rust bleeding • Ferrous Piping, internal and external • Pitting, discoloration

  12. Identifying...H 2 S Corrosion • Where to look • Headworks • Transfer Structures • Force Mains • Low velocities • Long detention times • Sections not flowing full • Air release manholes • Discharge manholes

  13. Identifying…H 2 S Corrosion Pipe Inv. El. vs. HGL (1,000 gpm in force main) 630 625 620 Look out for 615 Elevation (ft) high points in 610 force mains 605 600 595 Pipe Inv El 590 HGL El 585 0 1000 2000 3000 4000 5000 6000 7000 8000 Distance from Lift Station (ft)

  14. Identifying…H 2 S Corrosion Pipe Inv. El. vs. HGL (820 gpm in force main) 630 625 620 Look out for 615 Elevation (ft) high points in 610 force mains 605 600 595 Pipe Inv El 590 HGL El 585 0 1000 2000 3000 4000 5000 6000 7000 8000 Distance from Lift Station (ft)

  15. Identifying…H 2 S Corrosion • Where to look • Underdeveloped/Oversized Lift station wet wells • Sewers • Lines with minimal flow • Long, flat sewers • Turbulence • Transition and drop manholes • Pipe slope changes • Downstream of Industries

  16. Identifying...H 2 S Corrosion • How to measure • Televising, Air Monitoring

  17. Identifying…H 2 S Corrosion Panoramo MH Red Arrow Odalogger Viewer

  18. Identifying…H 2 S Corrosion OdaLog Results Red Arrow Odalogger

  19. Identifying…H 2 S Corrosion OdaLog Results

  20. Mitigating…H 2 S Corrosion Coating/Lining

  21. Mitigating…H 2 S Corrosion Polymer Concrete Manholes

  22. Mitigating…H 2 S Corrosion Cured in place pipe

  23. Mitigating…H 2 S Corrosion Chemical addition

  24. Mitigating…H 2 S Corrosion Biofilters

  25. Mitigating…H 2 S Corrosion Aeration

  26. Mitigating…H 2 S Corrosion Electrical Sealoffs

  27. Electrochemical Corrosion

  28. Understanding…Electrochemical Corrosion • Return of Metals to their Ores • Dissipation of energy consumed by mining, refining and manufacturing

  29. Understanding…Electrochemical Corrosion • Electrical potential • Anode • Cathode • Electrolyte • Solution of acids, bases or salts

  30. Understanding…Electrochemical Corrosion Galvanic Series (Atlas Steel Technical Note No. 7 "Galvanic Corrosion“)

  31. Understanding…Electrochemical Corrosion Iron Corrosion Schematic (chem1.com)

  32. Identifying…Electrochemical Corrosion • What it looks like

  33. Identifying…Electrochemical Corrosion • Where to look • Ferrous piping or tanks in aggressive soils • Pumping chambers • Above grade piping

  34. Mitigating…Electrochemical Corrosion Cathodic protection - galvanic/ sacrificial anodes

  35. Mitigating…Electrochemical Corrosion Cathodic protection - Impressed current

  36. Mitigating…Electrochemical Corrosion Anodizing Galvanizing

  37. Mitigating…Electrochemical Corrosion Isolation of dissimilar metals

  38. Mitigating…Electrochemical Corrosion Polyethylene encasement

  39. Recommendations • Know your system • Corrosion Detection and Monitoring Strategy • Maintain records • GIS • Maintenance procedures • Monitor potential problem areas regularly • Proper system design

  40. Thank You

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