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High-strength ammonium wastewater treatment by MBR: Steady-state nitrification kinetic parameters.

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Roy, Dany; Benkaraache, Sanae; Lemay, Jean-François; Landry, Dany; Drogui, Patrick; Tyagi, Rajeshwar Dayal (2019). High-strength ammonium wastewater treatment by MBR: Steady-state nitrification kinetic parameters. Journal of Water Process Engineering , vol. 32 . p. 100945. DOI: 10.1016/j.jwpe.2019.100945.

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In this study, a steady-state operation approach is proposed in order to accurately measure the kinetic parameters of substrate (contaminants) removal in wastewater biotreatment systems. In order to determine the kinetic parameters of a submerged membrane bioreactor (sMBR) when treating high-strength ammoniacal nitrogen wastewaters, a lab-scale sMBR was operated for 205 days with synthetic leachates (1000 mg L−1) at 4 different ammoniacal nitrogen concentrations (220, 340, 665 and 1040 mg NH4-N L−1). Ammoniacal nitrogen oxidation rates were calculated by solving the mass balance equations when steady-state conditions were reached for each tested concentration. The Haldane model was found to be accurate when predicting the specific ammoniacal nitrogen oxidation rates with the following kinetic parameters: rNH,max = 854,4 mg NH4-N L−1 d−1, KS = 1007 mg NH4-N L−1, and KI = 221 mg NH4-N L−1 (R2 = 0,97). The highest ammoniacal nitrogen oxidation rate was found to be 162 mg NH4-N L−1 d−1 when the effluent concentration was 472 mg NH4-N L−1. When compared to the conventional flask test approach for calculating the kinetic parameters, the steady-state approach described in this study showed a lower variability in the predicted specific nitrification rates, as well as a lower effect of the inhibition phenomena, due to the mixed liquor being adapted to each substrate concentration tested.

Type de document: Article
Mots-clés libres: kinetic; membrane bioreactor; ammoniacal nitrogen; leachate; nitrification
Centre: Centre Eau Terre Environnement
Date de dépôt: 17 avr. 2020 18:25
Dernière modification: 17 avr. 2020 18:25
URI: http://espace.inrs.ca/id/eprint/9711

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