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1. Designing a Bulk Sodium Hypochlorite System Presented by Patrick H. Allman III
General Manager
Odyssey Manufacturing Co.
3. Disinfection Options June 2003
4. Disinfection Options June 2005
5. Sodium Hypochlorite Bleach
Liquid Bleach
Liquid Chlorine
Soda Bleach Liquor
Chlorine
6. CHEMICAL FORMULA NaOCl
7. Manufacturing Process 2NaOH + Cl2 => NaOCl + H20 + Heat
8. Properties of Sodium Hypochlorite Mildly Corrosive
Has Free Sodium Hydroxide (Caustic Soda)
pH=12.5 to 13
Pale Yellow Solution, 12.5% By Volume
Non-Flammable
Incompatible with Many Other Chemicals
Relatively Short Shelf Life - Contaminants, Heat And UV Cause Decomposition
9. Contrary to Whites Handbook of Chlorination One Gallon of 120 GPL or 12 Trade Percent
Equals
1 lb of Cl gas
10. BLEACH DEGRADATION Primary
3NaOCl = 2NaCl + NaClO3 (Sodium Chlorate)
Secondary
2NaOCl = 2NaCl + O2 (Gassing)
Factors:
Heat
UV (e.g., Sunlight)
Impurities (Primarily Heavy Metals)
Strength (Rate = K (OCl-]2
13. Sodium Hypochlorite Degradation Average Manufacturer @ 70 Degrees F Time of Manufacture - 12.5 Trade Percent
2 Days Later 12.43 Trade Percent
7 Days Later 12.25 Trade Percent
14 Days Later 12.01 Trade Percent
21 Days Later 11.78 Trade Percent
28 Days Later 11.55 Trade Percent
35 Days Later 11.34 Trade Percent
14. Sodium Hypochlorite Degradation Average Manufacturer @ 80 Degrees F Time of Manufacture - 12.5 Trade Percent
2 Days Later 12.34 Trade Percent
7 Days Later 11.96 Trade Percent
14 Days Later 11.47 Trade Percent
21 Days Later 11.01 Trade Percent
28 Days Later 10.59 Trade Percent
35 Days Later 10.21 Trade Percent
15. Use of Pilot or Temporary Systems To Maintain Continuous Disinfection During Conversion Construction
To size pumps and bulk storage tanks
To Determine Finished Water Quality
To Test different types of Equipment
Familiarize Operations Personnel with Sodium Hypochlorite
Verify Operations in Unusual Situations
16. Sodium Hypochlorite System Design Delivery
Bulk Storage
Chemical Feed Equipment
Piping
17. Delivery to End-User Bulk Delivery in 5,000-gallon tanker truck
Poured from Small Delivery 26 Flat-Bed Truck w/installed HDLPE totes or tanks
300-gallon totes (forklift)
55 gallon drums
15, 30 gallon totes
2.5 gallon jugs
19. Bulk Delivery Site Should Have . . . 2 Supported Male Connection w/Cap
Bag Filter 1 micron
Safety Shower/Eye Wash/Running Water
Security/Lights
Hook Up Protection / Labeled Lines
Proper Venting for Blow Off
Catch Bucket
Accessible Roadway and Turn Around
20. Fill Line Air Pressure 15 to 25 psi
Trucks Carry Up to 60 Hose
Long Length Consider Upsizing to 3
Length Proportional to Offload Time
Maximum Length 200
Proper supports 45 Degree Down
Keep Line Vented
21. Bulk Storage Tanks Location Covered vs. Non-Covered / Other Chemicals On-site
Air Conditioning Storage Spaces
Dilution of Stored Material Use Soft Water
Type (FRP vs. Bulk)
Size or Volume and Number (10 to 40 days)
Use of Day Tanks (F.S. 62-555)
Measuring Daily Usage (F.S. 62-555)
Tie Downs
22. Storage Tank Fittings Vents (2 or 3) Use Vinyl Bug Screen
Drains Minimize # of Tank Penetrations
Fill Line Fill from Top not Side or Bottom
Overflow Line Maximize Use of Tank
Sight glasses Type/Operational Necessity
Tanks Squat - Flexible Connection at Bottom
Feed Line - Pulling Out of the Top or Bottom
Bottom Fittings Types/Titanium is only acceptable Metal
Gaskets Viton Only; No EPDM
23. Containment Requirements Florida Statues/RQ
HDLPE Tubs
Poured Wall / Concrete Block Wall
Coatings
Wall Penetrations
24. Types of Piping Schedule 80 PVC Most Commonly Used
Schedule 80 CPVC Plasticization
Schedule 40 Should Not Be Used
Kynar Expensive/Workmanship Issues
Carbon Steel Lined with Teflon or Kynar Typically used in Power Plants; Beware of Sizing Issues
25. PVC Applications: Socket Welding vs. Threaded Connections Minimize the Use of Threaded Connections
Use Stainless Steel Re-inforced Fittings on Threaded Joints When Possible Pump Discharge Fittings
If you must use a threaded connection, two wraps of Teflon Tape only
Use proper glue procedure 45-Degree Bevel, Debur, Clean/Prime, and Glue Each End.
Use proper Glue:
IPS WELDON CPVC 724 24 to 48 hrs setup time (grey)
IPS EZ WELDON WET R DRY PVC 725 10 minutes under low pressure (blue)
26. Valves Use the same model of Valve throughout the entire project; Standardize!
True Union with Viton o-rings No EPDM
Bleed Hole for Pressure Buildup
Socket Weld Ends, No Threaded Connections
27. Piping to Chemical Feed Equipment Purpose Minimize Off-Gassing
Pipe Sizing Optimize velocity
Minimize Length Maximum 50
Stack Vents/Sightglasses Carry Off Gases
Minimize Bends Keep Gases in Solution
Use of Flexible Piping/Tubing
Eliminate High Spots Piping Pitch
Use of Strainers Catch PVC shavings
28. Chemical Feed Equipment Eductors vs. Positive Displacement Pumps
PD Pumps Peristaltic vs. Diaphragm
Pump Skids vs. Wall /Floor Mounting
Height of Equipment Suction Lift Issues
Degasification Valves When To Use
Vapor Lock Issues Bleed Valve or Vent
Control Issues Flow Meters / 4-20 ma
99% of Most Operational Problems Come from Over-sizing Pumps!
29. Chemical Injection Piping Proper Sizing of Pipe Minimize Off-gassing and Provide Precision Control of Feed Rate
Backpressure Valves at End of Pipe Improve Feed Rate Control
Maximum Length of Injection Point 500
Turnover Time Less than 4 hours
Use of Solution or Carry Water
Design of Injection Points
Mixing Issues
Minimizing Calcification/Scaling
30. Water Quality Issues pH Boost - Typically .3 to .4 Units (.1 with OSG)
THMs Typically slight reduction (from Chlorine Gas)
Bromates Can Be Problematic with Ozone and Some Salt Sources (OSG); Ensure Quality Supplier
Chlorates May Be Regulated in the Future; Ensure Quality Supplier
Chlorides/Sodium Ensure Quality Supplier
Alga Control Bulk Strength as effective as Chlorine Gas
Chloramine Formation May be slightly more effective than Chlorine Gas because of pH shift
31. SYSTEM DESIGN SUMMARY Proper Engineering Design Essential To:
Eliminate Problems from Any Bleach Gassing
Eliminate Calcium Carbonate Buildup
Minimize Product Degradation
Improve Life of Equipment
Minimize Maintenance
Ensure No Startup Problems
Eliminate Problems from Using a Corrosive Material
32. Information Sources for Bleach Chlorine Institute Pamphlet 96
AWWA Standard B300-99
ANSI/NSF Standard 60
AWWA Reference Library
Material Safety Data Sheet (MSDS)
Sodium Hypochlorite Manufacturer
Equipment Fabricators (e.g. Pump Skids)