1. 09/07/2009Khelifi Faiza 1 Influence of trace elements in nitrification

2. 09/07/2009Khelifi Faiza 2 Introduction Nitrification: What is it and why is it important? Problems met by OASEN Company Batch experiment Conclusions

3. 09/07/2009Khelifi Faiza 3 Different ways to remove ammonium: Break point chlorination (not used in the Netherlands) Adsorption of ammonium on zeolites, ions exchange Stripping Biological conversion: Nitrification

4. 09/07/2009Khelifi Faiza 4 Nitrification Biological oxydation of ammonium into nitrite and then nitrate. NH 3 + 1,5 O 2 + nitrosomonas  NO 2 - +H 2 O + H + NO2 - + 0,5 O 2 + nitrospira  NO 3 -

5. 09/07/2009Khelifi Faiza 5 Why is it important? pH > 8 => NH 3 formation Nitrite formation  Poisonous for fish  Blue Baby syndrom NH 4 : Substrate for many bacteria

6. 09/07/2009Khelifi Faiza 6 Ammonium in filter effluent

7. 09/07/2009Khelifi Faiza 7 Batch experiment *Aeration *T=12°C *Shaking

8. 09/07/2009Khelifi Faiza 8 The results expected: NH 4 + decrease more quickly in bottles with trace elements. NO 3 - and NO 2 - increase more in bottles with trace element than in bottles without trace elements.

9. 09/07/2009Khelifi Faiza 9 NO 3 - and NO 2 -

10. 09/07/2009Khelifi Faiza 10 Total nitrogen

11. 09/07/2009Khelifi Faiza 11 Second experiment *T =20°C *Shaking *Single limitation

12. 09/07/2009Khelifi Faiza 12 Results

13. 09/07/2009Khelifi Faiza 13 Total nitrogen

14. 09/07/2009Khelifi Faiza 14 Conclusion

15. 09/07/2009Khelifi Faiza 15 Thank you for your attention, Questions ?