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Problem Filamentous microorganisms Solution Aluminium or ozone? Control of sludge age?

Prevention of filaments with aluminium or ozone at Klagshamn WWTP? Marika Wennberg*, Ulf Nyberg* and Karin Jönsson** * VA SYD **Lund University. Problem Filamentous microorganisms Solution Aluminium or ozone? Control of sludge age?. Aluminium. Ozone. Dimensioned p.e. 90 000 Actual p.e.

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Problem Filamentous microorganisms Solution Aluminium or ozone? Control of sludge age?

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  1. Prevention of filaments with aluminium or ozone at Klagshamn WWTP?Marika Wennberg*, Ulf Nyberg* and Karin Jönsson***VA SYD **Lund University

  2. ProblemFilamentous microorganismsSolutionAluminium or ozone? Control of sludge age?

  3. Aluminium Ozone

  4. Dimensioned p.e. 90 000 Actual p.e. 70 000 Actual flow 800 m3/h Discharge limits BOD7 10 mg/l* Tot-P 0.3 mg/l* Tot-N 12 mg/l** *monthly average **annual average

  5. Klagshamn WWTP

  6. Effects of filaments

  7. Aluminium treatment • Chemical: PAX-15 (polyaluminium chloride) • Dose: 1.2 g Al/m3 • Simple technical equipment • Treatment performed 2006-2009 • 1-3 months • Focus on DSVI (ml/g)

  8. Four periods of Al-treatment – four different outcomes

  9. Ozone treatment • Full-scale test, performed in one of the two lines • 2.5-months treatment • Dose: 550 g O3/h 0.006 g O3/g MLSS Process parameters • MLSS-concentration: 3 g/L • Sludge age: 20 days at start-up • Water temperature: 14°C at start-up

  10. Process layout

  11. Ozone makes a difference

  12. No ozone Ozone

  13. No ozone Ozone

  14. Improved settling properties

  15. 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

  16. Control of sludge age

  17. Estimated costs (SEK/year)

  18. What did we learn? • Dosing of Aluminium was and was not… • Ozonation was… • Controlling aerobic sludge age was not… …an option to prevent filamentous growth at Klagshamn WWTP.

  19. Acknowledgements Kemira Air Liquide Operational and laboratory staff at Klagshamn WWTP

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