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Influence of trace elements in nitrification

Influence of trace elements in nitrification. Introduction Nitrification: What is it and why is it important? Problems met by OASEN Company Batch experiment Conclusions. Different ways to remove ammonium: Break point chlorination (not used in the Netherlands)

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Influence of trace elements in nitrification

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  1. Influence of trace elements in nitrification Khelifi Faiza

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

  4. Nitrification • Biological oxydation of ammonium into nitrite and then nitrate. • NH3 + 1,5 O2 + nitrosomonas  NO2- +H2O + H+ NO2- + 0,5 O2 + nitrospira  NO3- Khelifi Faiza

  5. Why is it important? • pH > 8 => NH3 formation • Nitrite formation  Poisonous for fish  Blue Baby syndrom • NH4: Substrate for many bacteria Khelifi Faiza

  6. Ammonium in filter effluent Khelifi Faiza

  7. Batch experiment *Aeration*T=12°C*Shaking Khelifi Faiza

  8. The results expected: • NH4+ decrease more quickly in bottles with trace elements. • NO3- and NO2- increase more in bottles with trace element than in bottles without trace elements. Khelifi Faiza

  9. NO3- and NO2- Khelifi Faiza

  10. Total nitrogen Khelifi Faiza

  11. Second experiment *T =20°C *Shaking *Single limitation Khelifi Faiza

  12. Results Khelifi Faiza

  13. Total nitrogen Khelifi Faiza

  14. Conclusion Khelifi Faiza

  15. Thank you for your attention, Questions ? Khelifi Faiza

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