Acute Impact of Chlortetracycline on Nitrifying and Denitrifying Processes: Pulicharla et al. (1st July 2018)

• Record Type: Journal Article
• Authors: Pulicharla, Rama; Zolfaghari, Mehdi; Brar, Satinder Kaur; Drogui, Patrick; Auger, Serge; Verma, Mausam; Surampalli, Rao Y.
• Is Part Of: Water environment research. Volume 90:Number 7(2018)
• Page Start: 604
• Page End: 614
• Publication Date: 2018-07-01
• Subjects: chlortetracycline -- nitrification -- anoxic process -- kinetics -- inhibition -- toxicity; Water quality management -- Periodicals; Water -- Purification -- Periodicals; Water -- Pollution -- Periodicals; Water -- Pollution; Water -- Purification; Water quality management; Sewage; Water Pollution; Periodicals; Electronic journals; Periodicals; 628.16
• DOI: 10.2175/106143017X15131012153095
• Languages: English
• ISSNs: 1061-4303

Abstract

ABSTRACT: : 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.