Problem Filamentous microorganisms Solution Aluminium or ozone? Control of sludge age?
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Transcript of Problem Filamentous microorganisms Solution Aluminium or ozone? Control of sludge age?
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Prevention of filaments with aluminium or ozone at Klagshamn WWTP?
Marika Wennberg*, Ulf Nyberg* and Karin Jönsson***VA SYD **Lund University
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ProblemFilamentous microorganisms
SolutionAluminium or ozone?
Control of sludge age?
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Aluminium Ozone
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DS
VI (
ml/g
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Days of ozone addition0 10 20 30 40 50 60 70 80 90 100
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DS
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Days of aluminium addition
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Dimensioned p.e. 90 000Actual p.e. 70 000Actual flow800 m3/h
Discharge limitsBOD7 10 mg/l*Tot-P 0.3 mg/l*Tot-N 12 mg/l**
*monthly average**annual average
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Klagshamn WWTP
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Effects of filaments
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Aluminium treatmentChemical: PAX-15 (polyaluminium chloride)Dose: 1.2 g Al/m3
Simple technical equipmentTreatment performed 2006-20091-3 monthsFocus on DSVI (ml/g)
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Four periods of Al-treatment – four different outcomes
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DS
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ml/g
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Days of aluminium addition
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Ozone treatmentFull-scale test, performed in one of the two lines2.5-months treatmentDose: 550 g O3/h 0.006 g O3/g MLSS
Process parametersMLSS-concentration: 3 g/LSludge age: 20 days at start-upWater temperature: 14°C at start-up
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Process layout
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Ozone makes a difference
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DS
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ml/g
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Days of ozone addition
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No ozone Ozone
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No ozone Ozone
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Improved settling properties
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Days of ozone addition
Experimental line Control line
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Effects on nitrification
Lower nitrification rate (mg NH4-N/gVSS,d) in experimental line during lab tests
Higher concentrations of NH4-N in secondary effluent in experimental line
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Control of sludge age
2009-03-10 2009-04-18 2009-05-27 2009-07-05 2009-08-13 2009-09-210
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DSVI Measured sludge age Theoretical sludge age
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ml/g
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Sludge age (d)
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Estimated costs
Operating cost
Investment cost
Total cost
Ozone 48 000 250 000 298 000
Aluminium 32 000 5 000 37 000
Removal of floating sludge 300 000
(SEK/year)
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Dosing of Aluminium was and was not…Ozonation was…Controlling aerobic sludge age was not… …an option to prevent filamentous growth at Klagshamn WWTP.
What did we learn?
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Acknowledgements
KemiraAir LiquideOperational and laboratory staff at Klagshamn WWTP