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Effects of carbonate on the electrolytic removal of ammonia and urea from urine with thermally prepared IrO2 electrodes


Recent studies have shown that electrolysis can be an efficient process for nitrogen removal from urine. These studies have been conducted with urea solutions or fresh urine, but urine collected in NoMix toilets and urinals has a substantially different composition, because bacteria hydrolyse urea quickly to ammonia and carbonate. In this study, we compared electrochemical removal of nitrogen from synthetic solutions of fresh and stored urine using IrO2 anodes. We could show that in fresh urine both ammonia and urea are efficiently eliminated, mainly through chlorine-mediated oxidation. However, in stored urine the presence of carbonate, arising from urea hydrolysis, leads to an inhibition of ammonia oxidation. We suggest two parallel mechanisms to explain this effect: the competition between chloride and carbonate oxidation at the anode and the competition between chlorate formation, enhanced by the buffering effect of carbonate, and ammonia oxidation for the consumption of active chlorine in the bulk. However, further experiments are needed to support the latter mechanism. In conclusion, this study highlights the negative consequences of the presence of carbonate in urine solutions, but also in other wastewaters, when subjected to an electrolytic treatment on IrO2 in alkaline media.

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  1. 1.

    Larsen TA, Maurer M, Udert KM, Lienert J (2007) Water Sci Technol 56:229

  2. 2.

    Larsen TA, Alder AC, Eggen RIL, Maurer M, Lienert J (2009) Environ Sci Technol 16:6121

  3. 3.

    Maurer M, Pronk W, Larsen TA (2006) Water Res 40:3151

  4. 4.

    Udert KM, Wächter M (2012) Water Res 46:453

  5. 5.

    Bürgmann H, Jenni S, Vazquez F, Udert KM (2011) Appl Environ Microbiol 77:5897

  6. 6.

    Başakçılardan-Kabakcı S, İpekoğlu AN, Talınlı İ (2007) Environ Eng Sci 24:615

  7. 7.

    Anglada A, Urtiaga A, Ortiz I (2009) J Chem Technol Biotechnol 84:1747

  8. 8.

    Panizza M (2010) In: Comninellis C, Chen G (eds) Electrochemistry for the environment. Springer, New York, p 35

  9. 9.

    Rosca V, Duca M, DeGroot MT, Koper MTM (2009) Chem Rev 109:2209

  10. 10.

    Muthuvel M, Botte GG (2009) In: White RE (ed) Modern aspects of electrochemistry. Springer Science and Business Media, New York, pp 207–245

  11. 11.

    Boggs BK, King RL, Botte GG (2009) Chem Commun 32:4859

  12. 12.

    Diaz V, Ibanez R, Gomez P, Urtiaga AM, Ortiz I (2011) Water Res 45:125

  13. 13.

    Kapalka A, Katsaounis A, Michels NL, Leonidova A, Souentie S, Comninellis C, Udert KM (2010) Electrochem Commun 12:1203

  14. 14.

    Bunce NJ, Bejan D (2011) Electrochim Acta 56:8085

  15. 15.

    Gerischer H, Mauerer A (1970) J Electroanal Chem 25:421

  16. 16.

    Kapalka A, Joss L, Anglada A, Comninellis C, Udert KM (2010) Electrochem Commun 12:1714

  17. 17.

    Kapalka A, Cally A, Neodo S, Comninellis C, Wächter M, Udert KM (2010) Electrochem Commun 12:18

  18. 18.

    Kim KW, Kim YJ, Kim IT, Park GI, Lee EH (2005) Electrochim Acta 50:4356

  19. 19.

    Kapalka A, Fierro S, Frontistis Z, Katsaounis A, Frey O, Koudelka M, Comninellis C, Udert KM (2009) Electrochem Commun 11:1590

  20. 20.

    Michels NL, Kapalka A, Abd-El-Latif AA, Baltruschat H, Comninellis C (2010) Electrochem Commun 12:1199

  21. 21.

    Kapalka A, Fierro S, Frontistis Z, Katsaounis A, Neodo S, Frey O, de Rooij N, Udert KM, Comninellis C (2011) Electrochim Acta 56:1361

  22. 22.

    Simka W, Piotrowski J (2007) Przem Chem 86:841

  23. 23.

    King RL, Botte GG (2011) J Power Sources 196:9579

  24. 24.

    Ikematso M, Kaneda K, Iseki M, Matsuura H, Yasuda M (2006) Chem Lett 35:576

  25. 25.

    Udert KM, Larsen TA, Biebow M, Gujer W (2003) Water Res 37:2571

  26. 26.

    Udert KM, Larsen TA, Gujer W (2006) Water Sci Technol 54:413

  27. 27.

    Ouattara L, Fierro S, Frey O, Koudelka M, Comninellis C (2009) J Appl Electrochem 39:1361

  28. 28.

    Randtke SJ (2010) In: Black & Veatch Corporation (ed) White’s handbook of chlorination and alternative disinfectants. John Wiley and Sons, New Jersey, p 183

  29. 29.

    Kraft A, Stadelmann M, Blaschke M, Kreysig D, Sandt B, Schroder F, Rennau J (1999) J Appl Electrochem 29:861

  30. 30.

    Devkota LM, Williams DS, Matta JH, Albertson OE, Grasso D, Fox P (2000) Water Environ Res 72:610

  31. 31.

    Hernlem BJ (2005) Water Res 39:2245

  32. 32.

    Simka W, Piotrowski J, Robak A, Nawrat G (2009) J Appl Electrochem 39:1137

  33. 33.

    Wright JC, Michaels AS, Appleby AJ (1986) AIChE J 32:1450

  34. 34.

    Bezerra ACS, de Sá EL, Nart FC (1997) J Phys Chem B 101:6443

  35. 35.

    Di Giulio S, Jara CC, Fino D, Saracco G, Specchia V, Spinelli P (2007) Ind Eng Chem Res 46:6783

  36. 36.

    Trasatti S (1984) Electrochim Acta 29:1503

  37. 37.

    Vanlangendonck Y, Corbisier D, Van Lierde A (2005) Water Res 39:3028

  38. 38.

    Landolt D, Ibl N (1970) Electrochim Acta 15:1165

  39. 39.

    Van der Wiel PM, Janssen LJJ, Hoogland JG (1971) Electrochim Acta 16:1217

  40. 40.

    Zhang JJ, Oloman CW (2005) J Appl Electrochem 35:945

  41. 41.

    Ruiz EJ, Ortega-Borges R, Jurado JL, Chapman TW, Meas Y (2009) Electrochem Solid-State Lett 12:E1

  42. 42.

    Kim K-W, Kim Y-J, Kim I-T, Park G-II, Lee E-H (2006) Water Res 40:1431

  43. 43.

    Jung YJ, Baek KW, Oh BS, Kang JW (2010) Water Res 44:5345

  44. 44.

    Czarnetzki LR, Janssen LJJ (1992) J Appl Electrochem 22:315

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Funding for this project was provided by the Bill and Melinda Gates Foundation.

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Correspondence to Véronique Amstutz.

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Amstutz, V., Katsaounis, A., Kapalka, A. et al. Effects of carbonate on the electrolytic removal of ammonia and urea from urine with thermally prepared IrO2 electrodes. J Appl Electrochem 42, 787–795 (2012).

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  • Ammonia electrooxidation
  • Urea electrooxidation
  • Inhibition by carbonate
  • Carbonate electrooxidation
  • Urine treatment