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Zebra Mussel Abatement

Zebra Mussel Abatement. Anne Lucietto Fermi National Accelerator Laboratory FESS/Ops – Engineering April 18, 2007 2007 DOE/Contractor Fire Protection Workshop. Issues. The Zebra Mussel Methods of Control Control Considerations Project Steps. The Zebra Mussel. Methods of Control.

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Zebra Mussel Abatement

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  1. Zebra Mussel Abatement Anne Lucietto Fermi National Accelerator Laboratory FESS/Ops – Engineering April 18, 2007 2007 DOE/Contractor Fire Protection Workshop

  2. Issues • The Zebra Mussel • Methods of Control • Control Considerations • Project Steps

  3. The Zebra Mussel

  4. Methods of Control • Chemical molluscicides: Oxidizing (chlorine, chlorine dioxide) and Non-oxidizing • Manual removal (pigging, high pressure wash) • Dewatering / Desiccation (freezing, heated air) • Thermal (steam injection, hot water >32°C) • Acoustical vibration • Electrical current • Filters, Screens • Coatings: Toxic (copper, zinc) and Non-toxic (silicone-based) • Toxic constructed piping (copper, brass, galvanized metals) • Carbon dioxideinjection • Ultraviolet light • Anoxia / Hypoxia • Flushing

  5. Considerations Made by the Committee • Configuration of ICW System and Ponds • Location of Zebra Mussels found • Materials of system/age of system • History of repairs • Flows on a “normal” basis

  6. Other Considerations • There is no effective means of controlling zebra mussels. Prevention of further spread is key to minimizing its impacts. • Zebra mussels are physically removed from coated surfaces, such as water intake pipes, as needed.

  7. Steps in Project • Determine BEST method of abatement • Align System for Introduction Phase • Inject EVAC into system at Casey’s Pond • Monitor System for flow and concentration • Monitor System for signs of mussel separation • Begin/Continue Flush until cleared of shells

  8. Align System for Introduction Phase

  9. Inject EVAC into System at Casey’s Pond

  10. Injection Skid

  11. Monitor System for Flow and Concentration Lessons Learned Realignment needed to achieve accurate dosing in: • Main Injector • Main Ring/Tev • Area Near Cross Gallery

  12. 3 new hydrant flows introduced to induce accurate flow and dosing 60% increase in testing originally planned – to provide more data to benefit future treatment EVAC concentrations following this phase lower than anticipated (by 25%) Separation of shells progressing slower than anticipated due to lower water temps Changes Resulting in Successful Completion of Introduction Phase

  13. Lessons Learned • Flow is not even throughout system and changes to original procedure were necessary. • When completed they resulted in even chemical distribution. • Extra care needed on out flows from FCC and Industrial Buildings to eliminate/reduce fish kill in Bull Rush Pond and Proton Ditch. • When exercised no fish kill was observed.

  14. Monitor System for signs of Mussel Separation

  15. Pre-Flush department briefings 24/7 flushing by shop to minimize clogging Due to careful pre-planning and constant flushing no clogging occurred. Begin/Continue Flush Until Cleared of Shells

  16. Results of Flush 3,000# removed from pipes 10,200# removed from intake Heavy concentrations in: • Fixed Target • Meson Central Cryo/LLRW • TPL • PB6 & PB7 • Labs A-G • New Muon • CHL & IB1A • Reflecting Pond • Cross Gallery

  17. Results of Flush (con’t) • Smaller Shell Sizes at New Muon – somewhat uniform first flush • Very large sizes found near Wilson Hall (5-6 years old) • General mix in size throughout site

  18. Moving Forward • Twice a year treatment will keep all at bay and further issues with shells will not be an issue……will be transparent to user. • Other options are being investigated. • Overall in the first chemical treatment we were successful even though we had some problems. • Subsequent treatments were completely successful due to adjustments made from lessons learned.  • Watching for new/better technologies for zebra mussel abatement.

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