Presentation is loading. Please wait.

Presentation is loading. Please wait.

Designing a Bulk Sodium Hypochlorite System Presented by Patrick H. Allman III General Manager Odyssey Manufacturing Co.

Similar presentations


Presentation on theme: "Designing a Bulk Sodium Hypochlorite System Presented by Patrick H. Allman III General Manager Odyssey Manufacturing Co."— Presentation transcript:

1 Designing a Bulk Sodium Hypochlorite System Presented by Patrick H. Allman III General Manager Odyssey Manufacturing Co.

2 Disinfection Options – June 1999

3 Disinfection Options – June 2003

4 Disinfection Options – June 2005

5 Sodium Hypochlorite b Bleach b Liquid Bleach b Liquid Chlorine b Soda Bleach Liquor b Chlorine

6 CHEMICAL FORMULA NaOCl

7 Manufacturing Process 2NaOH + Cl 2 => NaOCl + H Heat

8 Properties of Sodium Hypochlorite b Mildly Corrosive b Has Free Sodium Hydroxide (Caustic Soda) b pH=12.5 to 13 b Pale Yellow Solution, 12.5% By Volume b Non-Flammable b Incompatible with Many Other Chemicals b Relatively Short Shelf Life - Contaminants, Heat And UV Cause Decomposition

9 Contrary to White’s Handbook of Chlorination One Gallon of 120 GPL or 12 Trade Percent Equals 1 lb of Cl gas 1 lb of Cl gas

10 BLEACH DEGRADATION b Primary 3NaOCl = 2NaCl + NaClO 3 (Sodium Chlorate)3NaOCl = 2NaCl + NaClO 3 (Sodium Chlorate) b Secondary 2NaOCl = 2NaCl + O 2 (Gassing)2NaOCl = 2NaCl + O 2 (Gassing) b Factors: HeatHeat UV (e.g., Sunlight)UV (e.g., Sunlight) Impurities (Primarily Heavy Metals)Impurities (Primarily Heavy Metals) Strength (Rate = K (OCl - ] 2Strength (Rate = K (OCl - ] 2

11

12

13 Sodium Hypochlorite Degradation – Average 70 Degrees F b Time of Manufacture Trade Percent b 2 Days Later – Trade Percent b 7 Days Later – Trade Percent b 14 Days Later – Trade Percent b 21 Days Later – Trade Percent b 28 Days Later – Trade Percent b 35 Days Later – Trade Percent

14 Sodium Hypochlorite Degradation – Average 80 Degrees F b Time of Manufacture Trade Percent b 2 Days Later – Trade Percent b 7 Days Later – Trade Percent b 14 Days Later – Trade Percent b 21 Days Later – Trade Percent b 28 Days Later – Trade Percent b 35 Days Later – Trade Percent

15 Use of Pilot or Temporary Systems b To Maintain Continuous Disinfection During Conversion Construction b To size pumps and bulk storage tanks b To Determine Finished Water Quality b To Test different types of Equipment b Familiarize Operations Personnel with Sodium Hypochlorite b Verify Operations in Unusual Situations

16 Sodium Hypochlorite System Design b Delivery b Bulk Storage b Chemical Feed Equipment b Piping

17 Delivery to End-User b Bulk Delivery in 5,000-gallon tanker truck b “Poured” from Small Delivery 26’ Flat-Bed Truck w/installed HDLPE totes or tanks b 300-gallon totes (forklift) b 55 gallon drums b 15, 30 gallon totes b 2.5 gallon “jugs”

18 Bulk Delivery by Tanker Truck FRP Tanker Trailer

19 Bulk Delivery Site Should Have... b 2” Supported Male Connection w/Cap b Bag Filter – 1 micron b Safety Shower/Eye Wash/Running Water b Security/Lights b Hook Up Protection / Labeled Lines b Proper Venting for Blow Off b “Catch Bucket” b Accessible Roadway and Turn Around

20 Fill Line b Air Pressure – 15 to 25 psi b Trucks Carry Up to 60’ Hose b Long Length – Consider Upsizing to 3” b Length Proportional to Offload Time b Maximum Length – 200’ b Proper supports – 45 Degree Down b Keep Line Vented

21 Bulk Storage Tanks b Location – Covered vs. Non-Covered / Other Chemicals On-site b Air Conditioning Storage Spaces b Dilution of Stored Material – Use Soft Water b Type (FRP vs. Bulk) b Size or Volume and Number (10 to 40 days) b Use of Day Tanks (F.S ) b Measuring Daily Usage (F.S ) b Tie Downs

22 Storage Tank Fittings b Vents – (2” or 3”) Use Vinyl Bug Screen b Drains – Minimize # of Tank Penetrations b Fill Line – Fill from Top not Side or Bottom b Overflow Line – Maximize Use of Tank b Sight glasses – Type/Operational Necessity b Tanks Squat - Flexible Connection at Bottom b Feed Line - Pulling Out of the Top or Bottom b Bottom Fittings – Types/Titanium is only acceptable Metal b Gaskets – Viton Only; No EPDM

23 Containment b Requirements – Florida Statues/RQ b HDLPE Tubs b Poured Wall / Concrete Block Wall b Coatings b Wall Penetrations

24 Types of Piping b Schedule 80 PVC – Most Commonly Used b Schedule 80 CPVC – Plasticization b Schedule 40 – Should Not Be Used b Kynar – Expensive/Workmanship Issues b Carbon Steel Lined with Teflon or Kynar – Typically used in Power Plants; Beware of Sizing Issues

25 PVC Applications: Socket Welding vs. Threaded Connections b Minimize the Use of Threaded Connections b Use Stainless Steel Re-inforced Fittings on Threaded Joints When Possible – Pump Discharge Fittings b If you must use a threaded connection, two wraps of Teflon Tape only b Use proper glue procedure – 45-Degree Bevel, Debur, Clean/Prime, and Glue Each End. b Use proper Glue: IPS WELDON CPVC 724 – 24 to 48 hrs setup time (grey)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)IPS EZ WELDON WET R’ DRY PVC 725 – 10 minutes under low pressure (blue)

26 Valves b Use the same model of Valve throughout the entire project; Standardize! b True Union with Viton o-rings – No EPDM b Bleed Hole for Pressure Buildup b Socket Weld Ends, No Threaded Connections

27 Piping to Chemical Feed Equipment b Purpose – Minimize Off-Gassing b Pipe Sizing – Optimize velocity b Minimize Length – Maximum 50’ b Stack Vents/Sightglasses – Carry Off Gases b Minimize Bends – Keep Gases in Solution b Use of Flexible Piping/Tubing b Eliminate “High Spots” – Piping Pitch b Use of Strainers – “Catch” PVC shavings

28 Chemical Feed Equipment b Eductors vs. Positive Displacement Pumps b PD Pumps – Peristaltic vs. Diaphragm b Pump Skids vs. Wall /Floor Mounting b Height of Equipment – Suction Lift Issues b Degasification Valves – When To Use b Vapor Lock Issues – Bleed Valve or Vent b Control Issues – Flow Meters / 4-20 ma b 99% of Most Operational Problems Come from Over-sizing Pumps!

29 Chemical Injection Piping b Proper Sizing of Pipe – Minimize Off-gassing and Provide Precision Control of Feed Rate b Backpressure Valves at End of Pipe – Improve Feed Rate Control b Maximum Length of Injection Point – 500’ b Turnover Time – Less than 4 hours b Use of Solution or “Carry” Water b Design of Injection Points b Mixing Issues b Minimizing Calcification/Scaling

30 Water Quality Issues b pH Boost - Typically.3 to.4 Units (.1 with OSG) b THM’s – Typically slight reduction (from Chlorine Gas) b Bromates – Can Be Problematic with Ozone and Some Salt Sources (OSG); Ensure Quality Supplier b Chlorates – May Be Regulated in the Future; Ensure Quality Supplier b Chlorides/Sodium – Ensure Quality Supplier b Alga Control – Bulk Strength as effective as Chlorine Gas b Chloramine Formation – May be slightly more effective than Chlorine Gas because of pH shift

31 SYSTEM DESIGN SUMMARY b Proper Engineering Design Essential To: Eliminate Problems from Any Bleach GassingEliminate Problems from Any Bleach Gassing Eliminate Calcium Carbonate BuildupEliminate Calcium Carbonate Buildup Minimize Product DegradationMinimize Product Degradation Improve Life of EquipmentImprove Life of Equipment Minimize MaintenanceMinimize Maintenance Ensure No Startup ProblemsEnsure No Startup Problems Eliminate Problems from Using a Corrosive MaterialEliminate Problems from Using a Corrosive Material

32 Information Sources for Bleach b Chlorine Institute Pamphlet 96 b AWWA Standard B b ANSI/NSF Standard 60 b AWWA Reference Library b Material Safety Data Sheet (MSDS) b Sodium Hypochlorite Manufacturer b Equipment Fabricators (e.g. Pump Skids)


Download ppt "Designing a Bulk Sodium Hypochlorite System Presented by Patrick H. Allman III General Manager Odyssey Manufacturing Co."

Similar presentations


Ads by Google