Municipal Wastewater Infrastructure Rehabilitation

1. Municipal Wastewater Infrastructure Rehabilitation

2. Sherwin Williams • Murray Heywood – Water & Wastewater Business Development Manager Eastern North America • 34 Years Coating Industry Experience • NACE Level 3 Coating Inspector • SSPC- Protective Coating Specialist • NACE CIP Instructor • MPI- Architectural Coating Specialist • Chair- SSPC Ontario Chapter

3. Learning Objectives • Causes of Deterioration of Concrete in Municipal Infrastructure • Stopping Inflow & Infiltration • Structural Rehabilitation Materials • Chemical Resistant Coatings and Linings

4. Causes of Deterioration • Structural Fatigue • Corrosive Gases • Microbial Induced Corrosion (MIC) • Old Age

5. Causes of Deterioration • Infrastructure Now Reaching Its Intended Life Cycle Of 50 Years • Sewage Has Become More Septic Due to Longer Dwell Times • Poor or Poorly Placed Concrete • More Industrial Waste Entering Stream • Different Organic Components

6. Structural Fatigue Manholes • Caused by: • Traffic Loading • Freeze/Thaw Cycling • Soil Movement • Erosion or Cavitation

7. Corrosive Gases • Hydrogen Sulfide – H2S • Corrosive to metal and concrete • Reduces the pH level • Converts to sulfuric acid when it comes in contact with Sulfur Reducing Bacteria (SRB’s)

8. Corrosive Gases • Carbon Dioxide • Slow deterioration of the substrate • Naturally occurring • Acts to reduce pH of the substrate • Carbonated concrete

9. Microbial Induced Corrosion • Sulfur reducing bacteria (SRB) break down sulfates in the waste stream and produce hydrogen sulfide (H2 S) and carbon dioxide CO2. • The acidic gases H2S and CO2 act to reduce the pH of concrete from approximately 12 to as low as 9.

10. Microbial Induced Corrosion • Sulfur oxidizing bacteria (SOB’s) attach to the surface as sulfates are produced. • The SOB’s are known as Thiobacillus Thioxidans. They consume H2S and discharge sulfuric acid H2SO4 • The pH continues to drop and microbial growth accelerates creating more H2SO4 • Eventual structural failure

12. Stopping Inflow & Infiltration • Purpose: • Lower the cost of wastewater being treated at the plant. • Lower the cost of equipment maintenance associated with abrasive soils in the waste stream. • Protect the environment for Sanitary Sewer Overflows (SSO’s)

13. Stopping Inflow & Infiltration • Process • Treated through trenchless technology applications • Utilizing polyurethane grout injection • Sherwin Williams Partners with Avanti International for all grouting products

14. Typical Manhole Rehabilitation Program 1- Correct All I&I Issues 2- Determine Level Of Deterioration of Concrete 3- Determine Areas of High H2S 4- Develop a Budget 5- Develop a Rehabilitation Plan

15. Typical Manhole Rehabilitation Program Rehabilitation Plan While manholes properly repaired with mortar and properly lined with Epoxy will typically have a 50 year life span not all municipalities have the budget to use a full mortar and lining system for all manholes. Sherwin Williams Can Help Develop a Manhole Rehabilitation Plan

16. Typical Manhole Rehabilitation Program Rehabilitation Plan (After All I&I Stopped) • Lift Station/Force Main and next 4-5 Holes- Repair Mortar Lined With 125 mils of Epoxy • Next Consecutive 4-5 Holes - Calcium Aluminate Mortar Lining – ½”-4” Nominal Thickness. • Next Consecutive Holes to Next Lift Station- Microsilica Mortar Lining - ½”-4” Nominal Thickness • Then Re-Start Process at Next Lift Station. * Approximate Plan Must Be Customized

17. Structural Rehabilitation Materials • Cementitious Repair Mortars • Portland Cement with Admixtures or Calcium Aluminates • Sprayed or trowel applied • New product mixes allow radial spray with no entry into manhole • Will degrade as the original surface did

18. Structural Rehabilitation Materials • Portland Cement • This is the most commonly used cement during the precasting and/or cast-in-place production of today’s wastewater components. • Relatively Inexpensive • Easily Located • Susceptible to MIC • Long cure times before top coating

19. Structural Rehabilitation Materials • Microsilica Repair Mortars • Microsilica repair mortars utilize Portland cement to create the cement paste but also contain a fumed silica admixture to create a more dense substrate. • Chemical Resistant / Lower Permeability • Can be used as a stand-alone liner in a mild H2S environments. • Faster cure times for top coating • Susceptible to MIC • Lower cost than Calcium Aluminate Mortars

20. Structural Rehabilitation Materials • Calcium Aluminate Repair Mortars • The principle behind Calcium Aluminates is that they maintain a higher pH that prevents they colonization of the Thiobacillus bacteria. • Offer an improved life cycle over other repair mortars • Susceptible to MIC but a reduced rate • Can be used as a stand-alone liner in moderate H2S environments.

23. Chemical Resistant Coatings & Linings • Protect the surrounding environment • Provide a longer life cycle for the substrate they are protecting • Provide an excellent infiltration barrier • Available chemistries include: • Epoxy • Polyurethane • Polyurea

24. Chemical Resistant Coatings & Linings • All 3 Chemistries (Epoxy, Polyurethane & Polyurea) have a place in Lining Wastewater Structures and Tanks • Sherwin Williams Has Developed Our Manhole Rehabilitation Program Around Epoxy Technology

25. Manhole Rehabilitation Chemical Resistant Linings Competitive Manhole Lining Products in the market Include; • Epoxy Technology • Polyurethane Technology • Polyurea Technology • What's The Difference ????

26. Manhole Rehabilitation Chemical Resistant Linings Polyurethane Products • Require a Primer For SSD Conditions • Isocyanate Will Blister In The Presence of Moisture During Application • Very Poor Bond When Directly Applied To Concrete • Most Products Are Actually Free Floating In the Manhole and Not Physically Attached to Walls • I&I Can Occur Between Lining an Wall and No One Would Know. • Mostly Small to Medium Sized Regional Manufacturers with Protected Territories.

27. Manhole Rehabilitation Chemical Resistant Linings Polyurea Products • Require a Primer For SSD Conditions • Isocyanate Will Blister In The Presence of Moisture During Application • Very Poor Bond When Directly Applied To Concrete • Often Applied Over Foam Which Has Little To No Structural Integrity. • Application Equipment Very Bulky • Surface Preparation Must Be Perfect for Success. • Mostly Small to Medium Sized Regional Manufacturers with Protected Territories.

28. Manhole Rehabilitation Chemical Resistant Linings Epoxy Products • High Bond Strength to Prepared Concrete • Most Can Be Applied to SSD Substrate • Amine Epoxy provides High Chemical Resistance • High Build Characteristics • Ease of Application • Beware of Claims that Epoxy Can be Directly Applied To Brick Manholes Without Mortar Repairs. • Mostly Small to Medium Sized Regional Manufacturers Some Have Protected Territories.

29. Manhole Rehabilitation Chemical Resistant Linings Why The Sherwin Williams Manhole Program? • Tried and True Technology- SW Chose Epoxy As The Liner of Choice Because It Makes Sense!! • Only True National Company in The Manhole Market • Single Source Supplier-Partnerships with Avanti (Chemical Grouts) A.W Cook (Repair Mortars) With All Testing Completed Allowing Sherwin Williams to Offer Complete Warranty. • On Site Technical Support

30. Manhole Rehabilitation Chemical Resistant Linings Why The Sherwin Williams Manhole Program? • Multiple Levels of Support for Contractors & Owners • Local Representatives & Project Development Managers • Support of National Wastewater Specialists • Largest Manufacturer of Protective Coatings in North America • 4000 Stores Across North America • ISO Quality Control

31. Manhole Rehabilitation Chemical Resistant Linings • Sherwin-Williams Duraplate 5900 Epoxy Corrosion Protection Coating • 100% Solids, Amine Cured Epoxy, Capable of being applied @ 60 – 125 mils DFT in a single coat. • Maybe applied to a Surface Saturated Dry (SSD) Substrate. • The product offers well balanced physical performance characteristics for use in municipal wastewater streams and wastewater treatment facilities. • Also Available In An Epoxy Mortar

32. Manhole Rehabilitation Chemical Resistant Linings • Sherwin-Williams Duraplate 6100 Epoxy Corrosion Protection Coating • 100% Solids, Amine Cured Epoxy, Capable of being applied @ 125 – 250 mils DFT in a single coat. • Maybe applied to a Surface Saturated Dry (SSD) Substrate. • “Next Generation” of Epoxy- Higher Build and Higher Chemical Resistance • Dry to Touch in 2 Hrs • Put Back in Service in 5-6 Hrs (Temperature & RH Dependent)

33. Chemical Resistant Coatings & Linings • Sherwin-Williams Envirolastic AR 530 Brush Grade Polyurea Chimney Seal • 100% Solids, Aromatic, Pure Polyurea, Capable of being applied up to 250 Mils DFT in a single coat. • Primer required for application to concrete and steel and application to a Surface Saturated Dry (SSD) substrate. • The product offers a flexible liner capable of bridging a 1/8” crack. It will withstand severe traffic loading and is packaged in a side by side plural component cartridges for pneumatic application.

34. Municipal Wastewater Infrastructure Rehabilitation • Sherwin-Williams offers a complete line of products through our manufacture and distribution for the rehabilitation of all of your municipal wastewater infrastructure rehabilitation.

35. Thank YouQuestions?

36. Sherwin Williams Contacts Murray Heywood – Water & Wastewater Business Development Manager Eastern North America Mobile- 905-259-8246 Email- murray.c.heywood@sherwin.com Chris Hamilton – Protective & Marine Coating Specialist Eastern PA Mobile- 717-753-0653 Email- christopher.m.hamilton@sherwin.com Tim Bauman- Project Development Manager – PA Mobile – 724-714-1047 Email- tim.a.bauman@sherwin.com