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Identifying Ineffective Filters Using ATP: A Case Study from the Western Lake Superior Sanitary District

This study by Al Parrella addresses the increasing bacteria levels in effluent filters at the Western Lake Superior Sanitary District. Observations indicate a seasonal pattern, with heightened fecal coliform readings near the end of the season. Testing ATP levels at various filter locations revealed significant issues, particularly with filter number 11, where mechanical problems with the backwash system were discovered. This research highlights the importance of ATP testing in maintaining effective filtration systems and improving overall water quality.

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Identifying Ineffective Filters Using ATP: A Case Study from the Western Lake Superior Sanitary District

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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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