use of atp to identify poor- performing filters al parrella western lake superior sanitary district...
TRANSCRIPT
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Use of ATP to identify poor-performing filters
Al ParrellaWestern 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 filtersMonthly geometric mean
April May June July August SeptemberOctober0
50
100
150
200
250
300
350
400
450
BeforeAfter
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Fecal coliform, before and after filtersMonthly geometric mean
April May June July August SeptemberOctober0
50
100
150
200
250
300
350
400
450
BeforeAfter
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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Seco
ndary Effl
uent
Floc T
ank I
nfluent
Filter
Effluen
t 1
Filter
Effluen
t 2
Filter
Effluen
t 3
Filter
Effluen
t 4
Filter
Effluen
t 5
Filter
Effluen
t 6
Filter
Effluen
t 7
Filter
Effluen
t 8
Filter
Effluen
t 9
Filter
Effluen
t 10
Filter
Effluen
t 11
Filter
Effluen
t 12
Final
Effluen
t0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
ATP Assessment October 2, 2013
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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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Seco
ndary Effl
uent*
Floc T
ank I
nfluent
Filter
Effluen
t 1
Filter
Effluen
t 2
Filter
Effluen
t 3
Filter
Effluen
t 4
Filter
Effluen
t 5
Filter
Effluen
t 6
Filter
Effluen
t 7
Filter
Effluen
t 8
Filter
Effluen
t 9
Filter
Effluen
t 10
Filter
Effluen
t 11
Filter
Effluen
t 12
Backwash
Wate
r
Final
Effluen
t0
500
1000
1500
2000
2500
3000
3500
4000
4500
ATP AssessmentOctober 15, 2013
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Conclusion
• It’s 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