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Acute Impact of Chlortetracycline on Nitrifying and Denitrifying Processes.

Pulicharla, Rama; Zolfaghari, Mehdi; Brar, Satinder Kaur; Drogui, Patrick; Auger, Serge; Verma, Mausam P.; Surampalli, Rao Y. (2018). Acute Impact of Chlortetracycline on Nitrifying and Denitrifying Processes. Water Environment Research , vol. 90 , nº 7. p. 604-614. DOI: 10.2175/106143017X15131012153095.

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Résumé

In the current study, sequential nitrification and anoxic experiments in synthetic municipal wastewater were exposed to 0.5 to 100 mg/L of chlortetracycline for 24 h to evaluate acute impact on the nitrification, and denitrification processes of biological treatment. Both processes were significantly (p < 0.05) inhibited at >50 mg/L of chlortetracycline, and the results revealed that nitrification was adversely affected by chlortetracycline compared with the anoxic process. In nitrification, chemical oxygen removal (COD) and ammonia oxidation kinetics were 50% inhibited at 10 mg chlortetracycline/L, and nitrite oxidation kinetics at 0.5 mg chlortetracycline/L. Likewise, in the anoxic process, 14 and 10 mg/L of chlortetracycline inhibited 50% of COD removal and nitrate reduction kinetics, respectively. In nitrification and denitrification, 90% of chlortetracycline was removed by adsorbing onto sludge suspended solids. In addition, a higher chlortetracycline concentration in anoxic effluent, compared with aerobic effluents, indicated a dissimilarity in the composition of sludge solids, pH, and biomass production for both processes.

Type de document: Article
Mots-clés libres: anoxic process; chlortetracycline; inhibition; kinetics; nitrification; toxicity
Centre: Centre Eau Terre Environnement
Date de dépôt: 25 oct. 2018 19:20
Dernière modification: 25 oct. 2018 19:20
URI: http://espace.inrs.ca/id/eprint/7714

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