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Use of ATP to identify poor-performing filters

Use of ATP to identify poor-performing filters . Al Parrella Western Lake Superior Sanitary District Duluth, MN. Add bleach here. Final effluent. Problem statement:. Bacteria increases across effluent filters Seems to be a seasonal phenomenon (worse towards end of season).

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Use of ATP to identify poor-performing filters

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  1. Use of ATP to identify poor-performing filters Al Parrella Western Lake Superior Sanitary District Duluth, MN

  2. Add bleach here Final effluent

  3. Problem statement: • Bacteria increases across effluent filters • Seems to be a seasonal phenomenon (worse towards end of season)

  4. Fecal coliform, before and after filtersMonthly geometric mean

  5. Fecal coliform, before and after filtersMonthly geometric mean Limit Problem

  6. Troubleshooting • Use of ATP pen • Test ATP at various location including the effluent of each filter • Results reported as difference between “total” and “free”

  7. Results • Clearly there was a problem with number 11 filter • Found several mechanical issues related to backwash system

  8. Conclusion • It’s hard to clean 100+ tons of media

  9. Steps • Start meter • Obtain sample • Submerge pen • Break ampule • Mix • Obtain reading • Units are in “relative light units”

  10. Thanks to… • …Roger Sandstrom, Treatment Plant Operator • Kathy Hamel, PE, Operations and Maintenance Supervisor, Clean Water Production

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