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Published byAubrie Bireley Modified over 10 years ago
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Use of ATP to identify poor- performing filters Al Parrella Western Lake Superior Sanitary District Duluth, MN
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Add bleach here Final effluent
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Problem statement: Bacteria increases across effluent filters – Seems to be a seasonal phenomenon (worse towards end of season)
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Fecal coliform, before and after filters Monthly geometric mean
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Problem Limit
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Troubleshooting Use of ATP pen Test ATP at various location including the effluent of each filter Results reported as difference between total and free
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Results Clearly there was a problem with number 11 filter Found several mechanical issues related to backwash system
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Conclusion Its hard to clean 100+ tons of media
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Steps Start meter Obtain sample Submerge pen Break ampule Mix Obtain reading – Units are in relative light units
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Thanks to… …Roger Sandstrom, Treatment Plant Operator Kathy Hamel, PE, Operations and Maintenance Supervisor, Clean Water Production
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