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Influence of trace elements in nitrification

This study by Khelifi Faiza explores the critical role of trace elements in the nitrification process of ammonium in wastewater treatment. It examines the biological oxidation of ammonium to nitrite and nitrate and highlights the significance of nitrification for water quality. The research addresses problems faced by OASEN Company and presents results from batch experiments conducted at different temperatures, showing that trace elements enhance the reduction of ammonium and increase the formation of nitrate and nitrite. The findings can inform better management practices in wastewater treatment systems.

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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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